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1.
Jesus, Alexandre Cerqueira de.
Retroanálise de escorregamentos em solos residuais não saturados.
Degree: Mestrado, Geotecnia, 2008, University of São Paulo
URL: http://www.teses.usp.br/teses/disponiveis/18/18132/tde-10102008-090913/ 
;
► Foram estudados cinco casos históricos de escorregamentos ocorridos na cidade de Salvador - Bahia, através do levantamento e tratamento dos dados preexistentes. Também foram realizados…
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▼ Foram estudados cinco casos históricos de escorregamentos ocorridos na cidade de Salvador - Bahia, através do levantamento e tratamento dos dados preexistentes. Também foram realizados ensaios complementares através da instrumentação em campo com tensiômetros e ensaios de laboratório. A retroanálise, objetivo central desse trabalho foi realizada a partir das geometrias de cada uma das encostas, antes e após a ruptura resultando na definição dos possíveis parâmetros médios de resistência ao cisalhamento. Secundariamente foram realizadas análises de estabilidade convencional para a avaliação dos fatores de segurança de cada encosta, com os parâmetros de resistência na condição não saturada e saturada. Por fim foram efetuadas simulações numéricas que visavam reproduzir as condições que levaram à ruptura da encosta do Alto do Bom Viver, baseado nos conceitos da mecânica dos solos não saturados. Os resultados mostram que a maioria dos escorregamentos estudados, ocorre no horizonte do solo residual maduro, onde o valor de ângulo de atrito médio é 34º, condizente com as superfícies de rupturas pouco profundas observadas em campo. As análises paramétricas sugerem que o mecanismo de ruptura mais provável esteja relacionado à diminuição da coesão aparente do solo em virtude da diminuição da sucção.
Five historical cases of landslides in the city of Salvador, Bahia, were studied through the survey and treatment of the preexistent data. Complementary experiments were accomplished through the instrumentation field using tensiometers and laboratory testing. The back-analysis, main objective of this research, was accomplished through the geometries of each slope, before and after the rupture, resulting in the definition of the possible medium parameters of resistance to shear. Secondary, analysis of the conventional stability to the evaluation of safety factors of each slope was accomplished, with the parameters of resistance in the unsaturated and saturated condition. At last, numerical simulations were done, aiming at reproducing the conditions which led to the rupture of the slope of Alto do Bom Viver, based on the concepts of mechanics of non saturated soil. The results demonstrated that the majority of the slips studied occur in the horizon of the mature residual soil, where the value of the angle of the medium attrition is of 34 degrees, suitable with the surface of little deep ruptures observed in the field. The parametric analysis suggests that the most probable mechanism of rupture is related to the decrease of the apparent cohesion of the soil due to the decrease of suction.
Advisors/Committee Members: Vilar, Orencio Monje.
Subjects/Keywords: Back analysis; Encostas; Ensaios de laboratório; Laboratory experiments; Numerical simulations; Residual soil; Retroanálise; Simulações numéricas; Slopes; Solo residual; Sucção; Suction
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APA (6th Edition):
Jesus, A. C. d. (2008). Retroanálise de escorregamentos em solos residuais não saturados. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/18/18132/tde-10102008-090913/ ;
Chicago Manual of Style (16th Edition):
Jesus, Alexandre Cerqueira de. “Retroanálise de escorregamentos em solos residuais não saturados.” 2008. Masters Thesis, University of São Paulo. Accessed January 17, 2021.
http://www.teses.usp.br/teses/disponiveis/18/18132/tde-10102008-090913/ ;.
MLA Handbook (7th Edition):
Jesus, Alexandre Cerqueira de. “Retroanálise de escorregamentos em solos residuais não saturados.” 2008. Web. 17 Jan 2021.
Vancouver:
Jesus ACd. Retroanálise de escorregamentos em solos residuais não saturados. [Internet] [Masters thesis]. University of São Paulo; 2008. [cited 2021 Jan 17].
Available from: http://www.teses.usp.br/teses/disponiveis/18/18132/tde-10102008-090913/ ;.
Council of Science Editors:
Jesus ACd. Retroanálise de escorregamentos em solos residuais não saturados. [Masters Thesis]. University of São Paulo; 2008. Available from: http://www.teses.usp.br/teses/disponiveis/18/18132/tde-10102008-090913/ ;
Luleå University of Technology
2.
Engström, Per.
Physical and numerical modeling of multiphase flows during Continuous Casting.
Degree: 2014, Luleå University of Technology
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-51526
► The quality of Continuous Casting (CC) products are highly connected to the flow of the liquid metal and injected argon inside the mould. Therefore,…
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▼ The quality of Continuous Casting (CC) products are highly connected to the flow of the liquid metal and injected argon inside the mould. Therefore, both physical and numerical modelling has been performed to investigate the metal flow inside the CC mould.A physical model has been used for investigating the flow inside the mould. Therefore, it uses a re-circulating technique along with a Bi-Sn alloy for representing the liquid steel. Moreover, velocity measurements using a Vives electromagnetic probe have been carried out where typical CC flow structures such as jet, upper and lower rolls were found. Overall, good contact between the metal and the Vives probe was achieved.The experiments showed that argon bubbles were possible to both count and classify using a high-speed camera with a framing rate of 500 frames per second. Almost 45% of the bubbles were discovered in the middle region of the mould (20% of the mould top surface area, central plane parallel to the wide faces). It was also found that the nozzle was misaligned.Levels of both alloy and the covering silicone oil were measured simultaneously using a Light beam sensor, which measured both levels at high accuracy. The usage of argon made the oil dirty, which in time made impossible to measure the level using the Light beam sensor.Argon bubbles along with a thin silicone oil layer were numerical modelled using a Discrete Phase Model combined with a Volume Of Fluid in a three dimensional model. This was solved using ANSYS Fluent 14.5.7. The fluid flow fields give streamlines that allows for further investigating of the flow patterns inside the model. In addition to these, more quantities can be post-processed for investigating different features of the flow. Also, bubbles were counted and it was shown that almost 50% of the bubbles were released within the middle region of the mould.
Validerat; 20140613 (global_studentproject_submitter)
Subjects/Keywords: Technology; Teknik; continuous casting; cfd; vof; volume of fluid; dpm; discrete phase model; ccs-1; numerical simulations; experiments; steel; Bi-Sn
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APA (6th Edition):
Engström, P. (2014). Physical and numerical modeling of multiphase flows during Continuous Casting. (Thesis). Luleå University of Technology. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-51526
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Engström, Per. “Physical and numerical modeling of multiphase flows during Continuous Casting.” 2014. Thesis, Luleå University of Technology. Accessed January 17, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-51526.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Engström, Per. “Physical and numerical modeling of multiphase flows during Continuous Casting.” 2014. Web. 17 Jan 2021.
Vancouver:
Engström P. Physical and numerical modeling of multiphase flows during Continuous Casting. [Internet] [Thesis]. Luleå University of Technology; 2014. [cited 2021 Jan 17].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-51526.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Engström P. Physical and numerical modeling of multiphase flows during Continuous Casting. [Thesis]. Luleå University of Technology; 2014. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-51526
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
KTH
3.
Roure, Océane.
NUMERICAL SIMULATIONS OF FRICTION-INDUCED NOISE OF AUTOMOTIVE WIPER SYSTEMS.
Degree: Marcus Wallenberg Laboratory MWL, 2015, KTH
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-180252
► Automotive parts may be the cause of very annoying friction-induced noise and the source of many customer complaints. Indeed, when a wiper operates on…
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▼ Automotive parts may be the cause of very annoying friction-induced noise and the source of many customer complaints. Indeed, when a wiper operates on a windshield, vibratory phenomena may appear due to flutter instabilities and may generate squeal noise. As squeal noise generated by wiper system is a random and complex phenomenon, there are only few studies dealing with the wiper noise. The complexity of this phenomenon is due to the cinematic of the movement and to the various environmental parameters which have an influence on the appearance of the noise. This master thesis is a research and development project and presents a numerical simulation methodology used in the aim to reduce and eradicate squeal noise of wiper systems. In the first part, the finite element model representing a wiper system and the numerical simulation methodology will be presented in detail. In the second part, stability analysis will be carried out in nominal studies and in designs of experiments. Parametric studies will also be achieved to understand the behavior and the influence of each considered input parameters. Two wiper blades, with the same geometry but with different material, will be considered for the different studies. These two wiper blades will be examined to figure out when squeal noises appear.
Subjects/Keywords: Squeal noise; wiper system; numerical simulations; finite element model; mode-coupling; design of experiments; Farmer diagram
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APA ·
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APA (6th Edition):
Roure, O. (2015). NUMERICAL SIMULATIONS OF FRICTION-INDUCED NOISE OF AUTOMOTIVE WIPER SYSTEMS. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-180252
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Roure, Océane. “NUMERICAL SIMULATIONS OF FRICTION-INDUCED NOISE OF AUTOMOTIVE WIPER SYSTEMS.” 2015. Thesis, KTH. Accessed January 17, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-180252.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Roure, Océane. “NUMERICAL SIMULATIONS OF FRICTION-INDUCED NOISE OF AUTOMOTIVE WIPER SYSTEMS.” 2015. Web. 17 Jan 2021.
Vancouver:
Roure O. NUMERICAL SIMULATIONS OF FRICTION-INDUCED NOISE OF AUTOMOTIVE WIPER SYSTEMS. [Internet] [Thesis]. KTH; 2015. [cited 2021 Jan 17].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-180252.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Roure O. NUMERICAL SIMULATIONS OF FRICTION-INDUCED NOISE OF AUTOMOTIVE WIPER SYSTEMS. [Thesis]. KTH; 2015. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-180252
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
4.
Ahmed, Dhafar Ibrahim.
Experimental and numerical study of model gravity currents in coastal environment : bottom gravity currents : Etude expérimentale et numérique de courants gravitaires modèles en environnement côtier : courant gravitaire dense.
Degree: Docteur es, Sciences pour l'ingénieur. Génie côtier, 2017, Brest
URL: http://www.theses.fr/2017BRES0060
► Le but de ce travail de recherche est de contribuer à une meilleure compréhension de la dynamique de propagation et de la miscibilité de jets…
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▼ Le but de ce travail de recherche est de contribuer à une meilleure compréhension de la dynamique de propagation et de la miscibilité de jets gravitaires au-dessous d’un liquide ambiant. Des expériences ont été réalisées en laboratoire à l’aide d’une plateforme expérimentale constituée d’un bassin parallélépipédique contenant de l’eau douce et d’un canal d’injection de section rectangulaire de jets gravitaires de concentration constante initiale fixée. Les calculs mathématiques et numériques sont basés sur les modèles RANS (Reynolds-Averaged Navier Stokes equations), k-ε (K-epsilon) et DCE (Diffusion-Convective Equation) de la fraction volumique de l’eau salée pour décrire la propagation et le mélange du jet gravitaire. L’évolution du front du jet obtenue expérimentalement est utilisée pour valider le modèle numérique. Par ailleurs, la comparaison des résultats obtenus sur l’écoulement moyen (z⁄z0.5 =U/Umax) avec ceux des études 2D expérimentales et numériques antérieures ont montré des similarités. La simulation numérique des champs hydrodynamiques montre que la vitesse maximale est atteinte à la position 0.18 z0.5, où z0.5 est la hauteur d’eau pour laquelle la vitesse moyenne u est égale à la moitié de la vitesse maximale Umax.
The aim of this investigation is to contribute to a better understanding of the propagation dynamics and the mixing process of dense gravity currents. The Laboratory experiments proceeded with a fixed initial gravity current concentration in one experimental set-up. The gravity currents are injected using a rectangular injection channel into a rectangular basin containing the ambient lighter liquid. The injection studied is said in unsteady state volume, as the Reynolds number lies in the range 1111 - 3889. The experiments provided the evolution of the boundary interface of the jet, and it is used to validate the numerical model. The numerical model depends on the Reynolds-Averaged Navier Stokes equations (RANS). The k-ε (K-epsilon) and the Diffusion-Convective Equation (DCE) of the saline water volume fraction were used to model the mixing and the propagation of the gravity current jet. On the other hand, comparison of the mean flow (z⁄z0.5 =U/Umax) with previous two-dimensional numerical simulations and experimental measurements have shown similarities. The numerical simulations of the hydrodynamic fields indicate that the velocity maximum at 0.18 z0.5, where z0.5 is the height at which the mean velocity u is the half of the maximum velocity Umax.
Advisors/Committee Members: Nsom, Blaise (thesis director).
Subjects/Keywords: Courant gravitaire dense; Jet flottant; Entraînement; Expériences; Mélange; Simulations Numériques; Modèle RANS; Bottom Gravity Current; Buoyant jet; Entrainment; Experiments; Mixing; Numerical simulations; RANS model
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APA ·
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CSE |
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Manager
APA (6th Edition):
Ahmed, D. I. (2017). Experimental and numerical study of model gravity currents in coastal environment : bottom gravity currents : Etude expérimentale et numérique de courants gravitaires modèles en environnement côtier : courant gravitaire dense. (Doctoral Dissertation). Brest. Retrieved from http://www.theses.fr/2017BRES0060
Chicago Manual of Style (16th Edition):
Ahmed, Dhafar Ibrahim. “Experimental and numerical study of model gravity currents in coastal environment : bottom gravity currents : Etude expérimentale et numérique de courants gravitaires modèles en environnement côtier : courant gravitaire dense.” 2017. Doctoral Dissertation, Brest. Accessed January 17, 2021.
http://www.theses.fr/2017BRES0060.
MLA Handbook (7th Edition):
Ahmed, Dhafar Ibrahim. “Experimental and numerical study of model gravity currents in coastal environment : bottom gravity currents : Etude expérimentale et numérique de courants gravitaires modèles en environnement côtier : courant gravitaire dense.” 2017. Web. 17 Jan 2021.
Vancouver:
Ahmed DI. Experimental and numerical study of model gravity currents in coastal environment : bottom gravity currents : Etude expérimentale et numérique de courants gravitaires modèles en environnement côtier : courant gravitaire dense. [Internet] [Doctoral dissertation]. Brest; 2017. [cited 2021 Jan 17].
Available from: http://www.theses.fr/2017BRES0060.
Council of Science Editors:
Ahmed DI. Experimental and numerical study of model gravity currents in coastal environment : bottom gravity currents : Etude expérimentale et numérique de courants gravitaires modèles en environnement côtier : courant gravitaire dense. [Doctoral Dissertation]. Brest; 2017. Available from: http://www.theses.fr/2017BRES0060
INP Toulouse
5.
Romdhane, Hela.
Etude expérimentale et modélisation d'écoulement à surface libre en présence de végétation, et transport sédimentaire associé : Experimental study and modeling of free surface flow in the presence of vegetation, and associated sediment transport.
Degree: Docteur es, Surfaces Interfaces Continentales Hydrologie, 2019, INP Toulouse
URL: http://www.theses.fr/2019INPT0032
► Les rivières forment un système dynamique complexe soumis à des variations de grande ampleur, en effet les précipitations sont jugées comme la cause fondamentale de…
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▼ Les rivières forment un système dynamique complexe soumis à des variations de grande ampleur, en effet les précipitations sont jugées comme la cause fondamentale de ces fluctuations. Au cours du temps, la morphologie des rivières évolue sous l’influence de plusieurs paramètres, en particulier les crues, les ouvrages hydrauliques, le transport sédimentaire. Le développement de la végétation dans le lit de la rivière et sur les berges peut affecter les conditions hydrodynamiques et le comportement des cours d'eau, ainsi l'impact de la végétation est une question cruciale pour la gestion des réseaux d'irrigation et des flux naturels. En réduisant la vitesse, la présence de végétation peut augmenter les dépôts de sédiments et modifier le risque d'inondation du fait des effets combinés de l'augmentation de la rugosité et de la diminution de la zone d'écoulement du chenal principal du fleuve. Ces aspects sont mis en avant par l’application de simulations numériques à des cas réels : cas de la Medjerda et du Canal Medjerda Cap Bon en Tunisie. La végétation est une caractéristique commune des eaux côtières et fluviales naturelles, interagissant à la fois avec le débit d'eau et le transport de sédiments. Cependant, les processus physiques qui régissent ces interactions sont encore mal compris, ce qui rend difficile la prévision du transport des sédiments et de la morpho dynamique. L’enjeu de cette thèse est d’améliorer la connaissance des processus physiques régissant les interactions entre végétation, écoulement et transport sédimentaire. Le but final est de pouvoir améliorer la gestion des hydro-systèmes artificiels ou naturels. Ce travail impliquera deux approches complémentaires d’expériences et de modélisation analytique et numérique. Dans un premier temps, on s’attachera à mieux caractériser les processus physiques d’interaction entre végétation et écoulement. Pour cela des expériences sur différents canaux fourniront l’hydrodynamique au-dessus de végétations modèles. On mettra l’accent sur le développement des méthodes expérimentales spécifiques à l’étude de couche limite au-dessus de macro-rugosités. Ces résultats seront dans un second temps analysés à partir de modèles analytiques qui permettent d’avoir les relations hauteur-débits nécessaires pour la gestion. Les caractéristiques et les performances de plusieurs modèles seront évaluées en regard des différents types de végétations. Dans un troisième temps, des expériences avec des sédiments préciseront l’influence de la végétation sur la modification du transport solide. La réduction des contraintes sur les lits engendre une adaptation nécessaire des lois de transport classique. Un modèle d’ajustement de ces lois sera proposé.
Rivers form a complex dynamic system subject to wide variations, in fact precipitation is considered as the fundamental cause of these fluctuations. Over time, the morphology of rivers evolves under the influence of several parameters, especially floods, hydraulic structures, sediment transport. The development of vegetation in the river…
Advisors/Committee Members: Dartus, Denis (thesis director), Soualmia, Amel (thesis director).
Subjects/Keywords: Ecoulement à surface libre; Expériences; Modèles analytiques; Simulations numériques; Transport sédimentaire; Végétation; Free surface flow; Experiments; Analytical models; Numerical simulations; Sediment transport; Vegetation
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APA ·
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MLA ·
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Manager
APA (6th Edition):
Romdhane, H. (2019). Etude expérimentale et modélisation d'écoulement à surface libre en présence de végétation, et transport sédimentaire associé : Experimental study and modeling of free surface flow in the presence of vegetation, and associated sediment transport. (Doctoral Dissertation). INP Toulouse. Retrieved from http://www.theses.fr/2019INPT0032
Chicago Manual of Style (16th Edition):
Romdhane, Hela. “Etude expérimentale et modélisation d'écoulement à surface libre en présence de végétation, et transport sédimentaire associé : Experimental study and modeling of free surface flow in the presence of vegetation, and associated sediment transport.” 2019. Doctoral Dissertation, INP Toulouse. Accessed January 17, 2021.
http://www.theses.fr/2019INPT0032.
MLA Handbook (7th Edition):
Romdhane, Hela. “Etude expérimentale et modélisation d'écoulement à surface libre en présence de végétation, et transport sédimentaire associé : Experimental study and modeling of free surface flow in the presence of vegetation, and associated sediment transport.” 2019. Web. 17 Jan 2021.
Vancouver:
Romdhane H. Etude expérimentale et modélisation d'écoulement à surface libre en présence de végétation, et transport sédimentaire associé : Experimental study and modeling of free surface flow in the presence of vegetation, and associated sediment transport. [Internet] [Doctoral dissertation]. INP Toulouse; 2019. [cited 2021 Jan 17].
Available from: http://www.theses.fr/2019INPT0032.
Council of Science Editors:
Romdhane H. Etude expérimentale et modélisation d'écoulement à surface libre en présence de végétation, et transport sédimentaire associé : Experimental study and modeling of free surface flow in the presence of vegetation, and associated sediment transport. [Doctoral Dissertation]. INP Toulouse; 2019. Available from: http://www.theses.fr/2019INPT0032
Delft University of Technology
6.
Zhu, Yunze (author).
Flow patterns in partially vegetated channels: Combining physical experiments and numerical modelling.
Degree: 2017, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:df8eb893-19df-45da-bd2f-db3253eb4eb7
► As coastal wetland ecosystems, thriving at the interface between land and water, mangroves can benefit us in lots of ways: providing food and timber, purifying…
(more)
▼ As coastal wetland ecosystems, thriving at the interface between land and water, mangroves can benefit us in lots of ways: providing food and timber, purifying water and sequestrating carbon, protecting coastal area through wave attenuation and coastal stabilization. Regarding the protection of coastal area, mangroves damp the flow in short term and mitigate coastal erosion in long term. In mangrove forests, the capability of mangroves to capture sediments leads to accumulation of sediments within the mangrove forests. Hence, the elevation of the floodplain, where the mangroves grow, is usually higher than the main river bed. The slope connecting the main river channel and floodplain has been found with different angle. The topography of the mangrove area is influenced by both sediment dynamics and hydrodynamics. The physical processes behind this is still not fully understood. This study aims to study the hydrodynamics in a partially vegetated compound channel by using the 2DH RANS model in Delft3D and to verify to what extend the flow characteristics can be reproduced. The reference
numerical model is set up to mimic the flume
experiments so that the model can be calibrated. The influence of different physical and environmental parameters on flow characteristics is studied. Also, the limitation of Delft3D in simulating the flow in a partially vegetated compound channel has been found.
Advisors/Committee Members: Ye, Qinghua (mentor), Truong Hong, Son (mentor), Aarninkhof, Stefan (graduation committee), Uijttewaal, Wim (graduation committee), Stive, Marcel (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: Mangroves; Flume experiments; Numerical Modelling
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APA ·
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APA (6th Edition):
Zhu, Y. (. (2017). Flow patterns in partially vegetated channels: Combining physical experiments and numerical modelling. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:df8eb893-19df-45da-bd2f-db3253eb4eb7
Chicago Manual of Style (16th Edition):
Zhu, Yunze (author). “Flow patterns in partially vegetated channels: Combining physical experiments and numerical modelling.” 2017. Masters Thesis, Delft University of Technology. Accessed January 17, 2021.
http://resolver.tudelft.nl/uuid:df8eb893-19df-45da-bd2f-db3253eb4eb7.
MLA Handbook (7th Edition):
Zhu, Yunze (author). “Flow patterns in partially vegetated channels: Combining physical experiments and numerical modelling.” 2017. Web. 17 Jan 2021.
Vancouver:
Zhu Y(. Flow patterns in partially vegetated channels: Combining physical experiments and numerical modelling. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Jan 17].
Available from: http://resolver.tudelft.nl/uuid:df8eb893-19df-45da-bd2f-db3253eb4eb7.
Council of Science Editors:
Zhu Y(. Flow patterns in partially vegetated channels: Combining physical experiments and numerical modelling. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:df8eb893-19df-45da-bd2f-db3253eb4eb7
7.
Trieu, Hung Truong.
Études théorique et expérimentale du transport de fluides miscibles en cellule Hele-Shaw : Theoretical and experimental study of fluid transport in miscible Hele-Shaw cell.
Degree: Docteur es, Mécanique - Génie civil, 2011, Lorraine INP
URL: http://www.theses.fr/2011INPL027N
► Dans cette thèse, nous avons étudié expérimentalement, numériquement et théoriquement la sédimentation d’un soluté en cellule de Hele-Shaw, modèle analogue de milieu poreux, avec un…
(more)
▼ Dans cette thèse, nous avons étudié expérimentalement, numériquement et théoriquement la sédimentation d’un soluté en cellule de Hele-Shaw, modèle analogue de milieu poreux, avec un écoulement zonal horizontal. Une cellule, alimentée par deux grands réservoirs assurant un écoulement zonal uniforme, a été réalisée au laboratoire. La vitesse a été mesurée par PIV. L’injection d’une solution saline dans cet écoulement permet de visualiser la propagation du panache de pollution, et de mesurer le champ de concentration par LIF. Trois configurations typiques ont été observées : panache sans digitation (« stable »), avec une seule digitation (« faiblement instable »), et avec de nombreuses digitations (« fortement instable »). L’influence du contraste de densité, de la vitesse zonale, et du débit d’injection sur la stabilité du panache a été analysée. Ces résultats ont été comparés à des simulations numériques sous COMSOL Multiphysics®. Les champs de concentration simulés sont en accord quantitatif avec les champs expérimentaux. Ces simulations ont de plus permis d’étudier l’influence de l’anisotropie du tenseur de dispersion sur la stabilité du panache. Une étude théorique linéaire, effectuée à partir d’un écoulement de base unidirectionnel et quasi-stationnaire, est venue compléter ces résultats. Elle montre que le panache est toujours convectivement instable pour les valeurs des paramètres considérées, et permet de retrouver et de quantifier les principaux résultats mis en évidence lors des études expérimentale et numérique, comme l’effet stabilisant de la dispersivité longitudinale ou l’effet déstabilisant du contraste de densité
This thesis is an experimental and numerical investigation of solute transport and sedimentation in a Hele-Shaw cell with zonal flow. A vertical cell joining two large tanks has been built to provide a uniform horizontal flow, the velocity of which has been measured by using PIV. The concentration field of a solute injected in this flow has been measured by using LIF. Three typical plume configurations have been observed: without digitations (“stable”), with a single digitation (“weakly unstable”), and with various digitations appearing at the lower interface (“unstable plume”). The influence of density contrast, zonal flow and solute flow rate on the appearance of the various configurations has been investigated. These results have been compared to numerical simulations using the COMSOL Multiphysics® software. The numerical concentration fields are in qualitative agreement with the experimental ones. In addition, these simulations allowed us to investigate the effect of the anisotropy of the dispersion tensor on the occurrence of unstable configurations. A linear stability analysis based on a uniform parallel flow superposed to a quasi-steady horizontal layer of solute has been performed. It shows that the plume is convectively unstable for the parameters considered here, and confirms the various behaviors observed in both the experimental and the numerical analyses, like the stabilizing…
Advisors/Committee Members: Buès, Michel A. (thesis director), Angilella, Jean-Régis (thesis director), Oltean, Constantin (thesis director).
Subjects/Keywords: Milieu poreux; Cellule Hele-Shaw; Solution saline; Contraste de densité; Instabilité; Expériences et simulation numérique; Porous media; Hele-Shaw cell; Solute transport; Density-driven flows; Instability; Experiments and numerical simulations
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APA (6th Edition):
Trieu, H. T. (2011). Études théorique et expérimentale du transport de fluides miscibles en cellule Hele-Shaw : Theoretical and experimental study of fluid transport in miscible Hele-Shaw cell. (Doctoral Dissertation). Lorraine INP. Retrieved from http://www.theses.fr/2011INPL027N
Chicago Manual of Style (16th Edition):
Trieu, Hung Truong. “Études théorique et expérimentale du transport de fluides miscibles en cellule Hele-Shaw : Theoretical and experimental study of fluid transport in miscible Hele-Shaw cell.” 2011. Doctoral Dissertation, Lorraine INP. Accessed January 17, 2021.
http://www.theses.fr/2011INPL027N.
MLA Handbook (7th Edition):
Trieu, Hung Truong. “Études théorique et expérimentale du transport de fluides miscibles en cellule Hele-Shaw : Theoretical and experimental study of fluid transport in miscible Hele-Shaw cell.” 2011. Web. 17 Jan 2021.
Vancouver:
Trieu HT. Études théorique et expérimentale du transport de fluides miscibles en cellule Hele-Shaw : Theoretical and experimental study of fluid transport in miscible Hele-Shaw cell. [Internet] [Doctoral dissertation]. Lorraine INP; 2011. [cited 2021 Jan 17].
Available from: http://www.theses.fr/2011INPL027N.
Council of Science Editors:
Trieu HT. Études théorique et expérimentale du transport de fluides miscibles en cellule Hele-Shaw : Theoretical and experimental study of fluid transport in miscible Hele-Shaw cell. [Doctoral Dissertation]. Lorraine INP; 2011. Available from: http://www.theses.fr/2011INPL027N
8.
Sauvan, Pierre-Emmanuel.
Etude des phénomènes physiques associés à la propagation d'ondes consécutives à une explosion et leur interaction avec des structures, dans un environnement complexe : Study of physical phenomenon associated to shock waves consecutive with an explosion and theirs interactions with structures, in a complex environment.
Degree: Docteur es, Mécanique - Energétique, 2012, Université d'Orléans
URL: http://www.theses.fr/2012ORLE2035
► Les travaux présentés dans ce mémoire de thèse s’inscrivent dans le cadre des études liées aux dégâts sur les structures et les blessures subies par…
(more)
▼ Les travaux présentés dans ce mémoire de thèse s’inscrivent dans le cadre des études liées aux dégâts sur les structures et les blessures subies par les personnes à la suite d’explosions de charges explosives en milieu confiné et semi-confiné. Afin de mener cette étude, des expériences sont réalisées à petite échelle en laboratoire et sont complétées par des simulations numériques. Les ondes de choc sont obtenues grâce à la détonation d’une charge explosive gazeuse composée de propane-oxygène en proportion stoechiométrique. L’étude consiste donc à réaliser des expériences à petite échelle en laboratoire afin d’apprécier les champs de pression obtenus à la suite de la détonation d’une charge explosive au sein de deux configurations différentes. La première représente un atelier pyrotechnique et la seconde met en jeu un entrepôt de stockage de bouteilles de gaz. Les résultats expérimentaux sont ensuite confrontés à des résultats obtenus par simulations numériques réalisées grâce au logiciel AUTODYN. En complément de ces deux configuration principales, une étude est menée sur l’identification des pics de surpressions réfléchis grâce à une approche expérimentale appelée paroi par paroi. Une étude est également menée sur la détermination d’une équivalence massique entre le TNT et le mélange gazeux utilisé pour les expériences.
The goal of this study is to investigate shock waves propagation, in a geometrically complex confined and semi-confined environment, consecutive to the detonation of a spherical explosive charge. In this objective, small scale experiments are conducted in laboratory and are completed with numerical analysis. Shock waves are generated thanks to spherical detonation of a gas mixture composed of propane-oxygen in stoechiometric proportion. Two main configurations are studied: the first represents a pyrotechnic workshop and the second is a warehouse containing gas cylinder. Experimental and numerical results are then compared. Complementary studies are realised to describe blast wave propagation inside a semi-confined volume thanks to a new experimental approach named wall by wall. Finally, in order to simulate TNT charges detonation by computational means, an important study is conducted to determine a mass equivalent between TNT and gas mixture.
Advisors/Committee Members: Sochet, Isabelle (thesis director).
Subjects/Keywords: Détonation; Onde de choc incidente; Onde de choc réfléchie; Milieu confiné et semi-confiné; Expériences à petite échelle; Simulations numériques (AUTODYN); Equivalent TNT; Detonation; Incident shock wave; Reflected shock wave; Confined and semi-confined environment; Small scale experiments; Numerical simulations (AUTODYN); TNT equivalent
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APA (6th Edition):
Sauvan, P. (2012). Etude des phénomènes physiques associés à la propagation d'ondes consécutives à une explosion et leur interaction avec des structures, dans un environnement complexe : Study of physical phenomenon associated to shock waves consecutive with an explosion and theirs interactions with structures, in a complex environment. (Doctoral Dissertation). Université d'Orléans. Retrieved from http://www.theses.fr/2012ORLE2035
Chicago Manual of Style (16th Edition):
Sauvan, Pierre-Emmanuel. “Etude des phénomènes physiques associés à la propagation d'ondes consécutives à une explosion et leur interaction avec des structures, dans un environnement complexe : Study of physical phenomenon associated to shock waves consecutive with an explosion and theirs interactions with structures, in a complex environment.” 2012. Doctoral Dissertation, Université d'Orléans. Accessed January 17, 2021.
http://www.theses.fr/2012ORLE2035.
MLA Handbook (7th Edition):
Sauvan, Pierre-Emmanuel. “Etude des phénomènes physiques associés à la propagation d'ondes consécutives à une explosion et leur interaction avec des structures, dans un environnement complexe : Study of physical phenomenon associated to shock waves consecutive with an explosion and theirs interactions with structures, in a complex environment.” 2012. Web. 17 Jan 2021.
Vancouver:
Sauvan P. Etude des phénomènes physiques associés à la propagation d'ondes consécutives à une explosion et leur interaction avec des structures, dans un environnement complexe : Study of physical phenomenon associated to shock waves consecutive with an explosion and theirs interactions with structures, in a complex environment. [Internet] [Doctoral dissertation]. Université d'Orléans; 2012. [cited 2021 Jan 17].
Available from: http://www.theses.fr/2012ORLE2035.
Council of Science Editors:
Sauvan P. Etude des phénomènes physiques associés à la propagation d'ondes consécutives à une explosion et leur interaction avec des structures, dans un environnement complexe : Study of physical phenomenon associated to shock waves consecutive with an explosion and theirs interactions with structures, in a complex environment. [Doctoral Dissertation]. Université d'Orléans; 2012. Available from: http://www.theses.fr/2012ORLE2035
9.
Eveillard, Sébastien.
Propagation d'une onde de choc en présence d'une barrière de protection : Propagation of blast wave in presence of the protection barrier.
Degree: Docteur es, Mécanique. Energétique, 2013, Université d'Orléans
URL: http://www.theses.fr/2013ORLE2026
► Les travaux de thèse présentés dans ce mémoire s’inscrivent dans le cadre du projet ANR BARPPRO. Ce programme de recherche vise à étudier l’influence d’une…
(more)
▼ Les travaux de thèse présentés dans ce mémoire s’inscrivent dans le cadre du projet ANR BARPPRO. Ce programme de recherche vise à étudier l’influence d’une barrière de protection face à une explosion en régime de détonation. L’objectif est d’établir des méthodes de calcul rapides de classement des zones d’effets pour aider les industriels au dimensionnement des barrières de protection. L’une à partir d’abaques, valable pour des configurations en géométrie 2D, sur des plages spécifiées de paramètres importants retenus, avec une précision de +/- 5%. L’autre à partir d’une méthode d’estimation rapide basée notamment sur les chemins déployés, valable en géométrie 2D et en géométrie 3D, mais dont la précision estimée est de +/- 30%. Afin d’y parvenir, l’étude s’appuie sur trois volets : expérimental, simulation numérique et analytique. La partie expérimentale étudie plusieurs géométries de barrière de protection à petites échelles pour la détonation d’une charge gazeuse (propane-oxygène à la stoechiométrie). Les configurations expérimentées servent à la validation de l’outil de simulation numérique constitué du solveur HERA et de la plateforme de calcul TERA 100. Des abaques d’aide au dimensionnement ont pu être réalisés à partir de résultats fournis par l’outil de simulation (3125 configurations de barrière de protection, TNT). L’étude des différents phénomènes physiques présents a également permis de mettre en place une méthode d’estimation rapide basée sur des relations géométriques, analytiques et empiriques. L’analyse de ces résultats a permis d’établir quelques recommandations dans le dimensionnement d’une barrière de protection. Les abaques et le programme d’estimation rapide permettent à un ingénieur de dimensionner rapidement une barrière de protection en fonction de la configuration du terrain et de la position de la zone à protéger en aval du merlon.
This thesis is a part of the ANR BARPPRO project. This research program studies this influence of the protection barrier during an explosion detonation. The goal of this project is to establish fast-computation methods of area classification effects to help the industrial to design the protection barrier on the SEVESO sites. One from abacus, for configurations in 2D geometry on specified parameters used, with an accuracy of +/- 5%. The other from a fast-running method based on broken lines for configurations in 2D and 3D geometries, but the accuracy is +/- 30%. This study includes three approaches: experimental, numerical simulation and analytical approaches. The experimental part studies several geometries of the protection barrier for a gaseous explosion (stoichiometric propane-oxygen mixture) at small scales. The experimental configurations used to validate the numerical simulation tool constituted of the HERA software and the TERA 100 supercomputer. The overpressure charts were able to generate from the numerical results (3125 configurations of the barrier for a TNT charge). The analysis of these results allows to establish different recommendations in the…
Advisors/Committee Members: Sochet, Isabelle (thesis director).
Subjects/Keywords: Détonation; Barrière de protection; Merlon; Onde de choc; Charge de gazeuse; Charge de TNT; Simulations numériques (HERA); Maillage adaptatif (AMR); Expériences à petite échelle; Detonation; Blast wall; Protection barrier; Blast wave; Gaseous explosion; TNT explosion; Numerical simulations (HERA); Adaptive mesh refinement (AMR); Small scale experiments
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APA ·
Chicago ·
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Export
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APA (6th Edition):
Eveillard, S. (2013). Propagation d'une onde de choc en présence d'une barrière de protection : Propagation of blast wave in presence of the protection barrier. (Doctoral Dissertation). Université d'Orléans. Retrieved from http://www.theses.fr/2013ORLE2026
Chicago Manual of Style (16th Edition):
Eveillard, Sébastien. “Propagation d'une onde de choc en présence d'une barrière de protection : Propagation of blast wave in presence of the protection barrier.” 2013. Doctoral Dissertation, Université d'Orléans. Accessed January 17, 2021.
http://www.theses.fr/2013ORLE2026.
MLA Handbook (7th Edition):
Eveillard, Sébastien. “Propagation d'une onde de choc en présence d'une barrière de protection : Propagation of blast wave in presence of the protection barrier.” 2013. Web. 17 Jan 2021.
Vancouver:
Eveillard S. Propagation d'une onde de choc en présence d'une barrière de protection : Propagation of blast wave in presence of the protection barrier. [Internet] [Doctoral dissertation]. Université d'Orléans; 2013. [cited 2021 Jan 17].
Available from: http://www.theses.fr/2013ORLE2026.
Council of Science Editors:
Eveillard S. Propagation d'une onde de choc en présence d'une barrière de protection : Propagation of blast wave in presence of the protection barrier. [Doctoral Dissertation]. Université d'Orléans; 2013. Available from: http://www.theses.fr/2013ORLE2026
10.
Boutillier, Johanna.
Contribution à la compréhension et à la modélisation des effets lésionnels sur le thorax des ondes de choc aériennes : Contribution to the understanding and modelling of the lesional effects on the thorax bound to the exposure to a shock wave.
Degree: Docteur es, Biomécanique, 2017, Université de Strasbourg
URL: http://www.theses.fr/2017STRAD003
► Dans le contexte actuel d’attentats et autres conflits armées, le risque lésionnel thoracique par explosion est exacerbé sans que pour autant l’on sache l’efficacité réelle…
(more)
▼ Dans le contexte actuel d’attentats et autres conflits armées, le risque lésionnel thoracique par explosion est exacerbé sans que pour autant l’on sache l’efficacité réelle des moyens actuels de protection thoracique individuelle face à une telle menace. Ce travail de thèse, combinant expérimentations et simulations numériques, a traité de front l’ensemble de la chaine physique entre la détonation d’une charge explosive et l’apparition de lésions pulmonaires. Un des premiers objectifs a été de comprendre les différents phénomènes physiques mis en jeu lors de la propagation de l’onde de choc en champ libre. Le large éventail de données expérimentales acquis a permis de développer des outils simples permettant la détermination des caractéristiques de la menace ainsi qu’une approche numérique robuste sous LS-DYNA. L’objectif suivant a été d’étudier l’interaction d’ondes de choc avec des cibles de géométries simples et de compositions différentes. L’analyse des données expérimentales acquises a permis, en plus de la validation numérique de l’interaction fluide-structure et des MEF des structures, de déterminer de possibles candidats pour la définition d’un critère de lésions thoraciques. Enfin, des essais sur réacteurs biologiques post-mortem ont été réalisés, permettant d’obtenir la réponse cinématique du thorax du modèle porcin sous blast. Tout ceci a permis d’aboutir à des voies d’amélioration et à des outils prometteurs pour permettre l’évaluation et l’évolution des systèmes de protection thoracique dans un futur assez proche afin de limiter les risques face à cette menace qui a gagné en importance ces dernières années.
With the increasing number of bombing attacks and armed conflicts, the risk of thoracic injuries caused by the blast threat is worsen, without knowing the efficiency of the current individual chest protection systems impacted by such a threat. This research, combining experiments and numerical simulations, dealt with the physics at play from the detonation of an explosive charge and the injury outcomes. One of the first objectives was to understand the different physical phenomena involved in the propagation of the shock wave in the open field. The huge set of data acquired allowed the development of simple tools for the determination of the blast characteristics as well as a robust numerical approach under LS-DYNA. The next objective was to study the interaction of shock waves with targets of simple geometries and different compositions. In addition to the numerical validation of the fluid-structure interaction and of the FEM of the structures, the analysis of the experimental data acquired allowed to determine possible candidates for the definition of a thoracic injury criterion. Finally, tests on biological post-mortem reactors have been carried out, which enabled to obtain the kinematic response of the swine’s thorax under blast. All this work has led to improvements and promising tools for the evaluation and the improvement of chest protection systems in the near future. The proposed tools…
Advisors/Committee Members: Willinger, Rémy (thesis director), Deck, Caroline (thesis director).
Subjects/Keywords: Onde de choc; Thorax; Expérimentations; Simulations numériques; Physique du blast; Interactions blast/structures; Critère de lésions pulmonaires; Substitut thoracique bio fidèle; Shock wave; Thoracic injuries; Experiments; Numerical simulations; Blast physics; Blast / structures interactions; Criterion of pulmonary lesions; True organic thoracic substitute; 571.43
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APA ·
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APA (6th Edition):
Boutillier, J. (2017). Contribution à la compréhension et à la modélisation des effets lésionnels sur le thorax des ondes de choc aériennes : Contribution to the understanding and modelling of the lesional effects on the thorax bound to the exposure to a shock wave. (Doctoral Dissertation). Université de Strasbourg. Retrieved from http://www.theses.fr/2017STRAD003
Chicago Manual of Style (16th Edition):
Boutillier, Johanna. “Contribution à la compréhension et à la modélisation des effets lésionnels sur le thorax des ondes de choc aériennes : Contribution to the understanding and modelling of the lesional effects on the thorax bound to the exposure to a shock wave.” 2017. Doctoral Dissertation, Université de Strasbourg. Accessed January 17, 2021.
http://www.theses.fr/2017STRAD003.
MLA Handbook (7th Edition):
Boutillier, Johanna. “Contribution à la compréhension et à la modélisation des effets lésionnels sur le thorax des ondes de choc aériennes : Contribution to the understanding and modelling of the lesional effects on the thorax bound to the exposure to a shock wave.” 2017. Web. 17 Jan 2021.
Vancouver:
Boutillier J. Contribution à la compréhension et à la modélisation des effets lésionnels sur le thorax des ondes de choc aériennes : Contribution to the understanding and modelling of the lesional effects on the thorax bound to the exposure to a shock wave. [Internet] [Doctoral dissertation]. Université de Strasbourg; 2017. [cited 2021 Jan 17].
Available from: http://www.theses.fr/2017STRAD003.
Council of Science Editors:
Boutillier J. Contribution à la compréhension et à la modélisation des effets lésionnels sur le thorax des ondes de choc aériennes : Contribution to the understanding and modelling of the lesional effects on the thorax bound to the exposure to a shock wave. [Doctoral Dissertation]. Université de Strasbourg; 2017. Available from: http://www.theses.fr/2017STRAD003
University of Manitoba
11.
Guyot, Meghan.
Discharging two-phase flow through single and multiple branches: experiments and CFD modelling.
Degree: Mechanical Engineering, 2016, University of Manitoba
URL: http://hdl.handle.net/1993/31934
► The main objectives of this study were to obtain new experimental data for conditions not previously tested for discharging two-phase flow through two 6.35 mm…
(more)
▼ The main objectives of this study were to obtain new experimental data for conditions not previously tested for discharging two-phase flow through two 6.35 mm diameter branches with centrelines falling in an inclined plane and to assess the applicability of ANSYS CFX in modelling discharging two-phase flow through various single and multiple branch geometries. The present results are relevant to many industrial applications including headers and manifolds, multichannel heat exchangers and small breaks in horizontal pipes.
In the experimental investigation, onsets of liquid and gas entrainment data were obtained, analyzed and correlated for two different branch spacings and two different angles between the branches. For each combination of branch spacing and angle between the branches, a wide range of Froude numbers was used. Two-phase mass flow rate and quality results were also obtained and analyzed for a range of interface heights for 16 different combinations of branch spacing, inclination angle, test section pressure and pressure drop across each branch. New correlations were developed to predict the dimensionless mass flow rate and the quality. The new correlations show good agreement with the present data and with previous correlations.
Using ANSYS CFX, the inhomogeneous, free surface model was used to model discharging two-phase flow through horizontal branches with the following configurations: a single short branch of square cross-section (G1), a single long branch of square cross-section (G2), a single long branch of round cross section (G3), two round branches located one on top of the other (G4), and two round branches with their centreplane angled 30° from the horizontal. For these five geometries, results were compared with previous and present results and showed good agreement for Geometries G1, G2, G3 and G5. For Geometry G4, CFX was unable to predict results when the interface was located such that the two phases flowed through both branches simultaneously. Under these conditions, the flow phenomena were too complicated and further investigations are necessary.
Advisors/Committee Members: Ormiston, Scott (Mechanical Engineering) Soliman, Hassan (Mechanical Engineering) (supervisor), Cenkowski, Stefan (Biosystems Engineering) Chatoorgoon, Vijay (Mechanical Engineering) Muzychka, Yuri (Mechanical Engineering, Memorial University) (examiningcommittee).
Subjects/Keywords: Two-phase; cfd; discharging; experiments; numerical
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APA (6th Edition):
Guyot, M. (2016). Discharging two-phase flow through single and multiple branches: experiments and CFD modelling. (Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/31934
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Guyot, Meghan. “Discharging two-phase flow through single and multiple branches: experiments and CFD modelling.” 2016. Thesis, University of Manitoba. Accessed January 17, 2021.
http://hdl.handle.net/1993/31934.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Guyot, Meghan. “Discharging two-phase flow through single and multiple branches: experiments and CFD modelling.” 2016. Web. 17 Jan 2021.
Vancouver:
Guyot M. Discharging two-phase flow through single and multiple branches: experiments and CFD modelling. [Internet] [Thesis]. University of Manitoba; 2016. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1993/31934.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Guyot M. Discharging two-phase flow through single and multiple branches: experiments and CFD modelling. [Thesis]. University of Manitoba; 2016. Available from: http://hdl.handle.net/1993/31934
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
12.
Mehra, Bineet.
Design and optimisation of innovative electronic cooling heat sinks with enhanced thermal performances using numerical and experimental methods : Conception et optimisation de dissipateurs thermiques de refroidissement électronique innovants.
Degree: Docteur es, Mécanique, Energétique, Matériaux, 2019, Ecole nationale supérieure Mines-Télécom Lille Douai
URL: http://www.theses.fr/2019MTLD0005
► Cette thèse de doctorat s’intéresse aux mécanismes d’amélioration des transferts dans des géométries de dissipateurs thermiques à plaques et ailettes. Une première partie est consacrée…
(more)
▼ Cette thèse de doctorat s’intéresse aux mécanismes d’amélioration des transferts dans des géométries de dissipateurs thermiques à plaques et ailettes. Une première partie est consacrée à l’étude d’une configuration académique à l’aide de simulations numériques visant à obtenir une amélioration du transfert de chaleur conjugué en modifiant uniquement par des découpes la forme géométrique des ailettes planes conductrices. Une analyse locale approfondie de l’écoulement et des champs thermiques a été effectuée avec notamment le principe de synergie locale, des champs de vitesse et de gradients thermiques, pour comprendre l’effet des modifications géométriques. Ce mémoire présente également le développement de dissipateurs aux performances thermo-aérauliques augmentées pour des applications de refroidissement de coffrets électronique embarqués. L’intensification des transferts thermiques est obtenue par la génération d’écoulements secondaires qui provoquent un brassage de fluide et réduisent la résistance thermique à la paroi en perturbant le développement de la couche limite thermique. Différentes configurations de dissipateurs avec deux types de générateurs d’écoulements secondaires, paires d’ailettes Delta et protrusions, ont été étudiées numériquement, en employant une modélisation de type « RANS ». Les performances thermo-aérauliques des géométries munies de générateurs de vorticité ont été comparées à celle d’un dissipateur thermique de référence « lisse ». Des prototypes ont également été fabriqués et testés sur un banc expérimental spécifiquement développé pour réaliser des mesures des performances globales en termes de puissance thermique et de pertes de charge. Les résultats expérimentaux et numériques ont été confrontés afin de qualifier les simulations réalisées. Par la suite, une étude d’optimisation employant l’analyse factorielle Taguchi a été utilisée afin d’optimiser les paramètres géométriques des dissipateurs retenus. Deux fonctions objectif ont été considérées : la maximisation du facteur de performance thermique à iso puissance de ventilation (PEC) et la réduction de la température moyenne de paroi du dissipateur par rapport au cas de référence. L’analyse des performances thermo-aérauliques globales des géométries étudiées a été complétée par une analyse qualitative locale des champs thermiques et d’écoulement notamment avec le principe de synergie.
This doctoral thesis focuses on mechanisms of heat transfer enhancement in plate and fin heat sink geometries. First part of the thesis is dedicated to study an academic configuration using numerical simulations to achieve an improvement in conjugate heat transfer by modifying only the geometrical shape (through punching) of the conductive plane fins. An in-depth local analysis of the flow and thermal fields was carried out with the local synergy principle, velocity and thermal gradients, to understand the effect of geometric modifications. This thesis also presents the development of heat sinks with increased thermo-hydraulic performance for on-board…
Advisors/Committee Members: Bougeard, Daniel (thesis director).
Subjects/Keywords: Refroidissement composant électronique; Amélioration du transfert de chaleur; Expériences; Simulation numérique; Principe de synergie de champ; Générateur d'écoulements secondaires; Electronic cooling; Heat transfer enhancement; Experiments; Numerical simulations; Field synergy principle; Secondary flow generators
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APA (6th Edition):
Mehra, B. (2019). Design and optimisation of innovative electronic cooling heat sinks with enhanced thermal performances using numerical and experimental methods : Conception et optimisation de dissipateurs thermiques de refroidissement électronique innovants. (Doctoral Dissertation). Ecole nationale supérieure Mines-Télécom Lille Douai. Retrieved from http://www.theses.fr/2019MTLD0005
Chicago Manual of Style (16th Edition):
Mehra, Bineet. “Design and optimisation of innovative electronic cooling heat sinks with enhanced thermal performances using numerical and experimental methods : Conception et optimisation de dissipateurs thermiques de refroidissement électronique innovants.” 2019. Doctoral Dissertation, Ecole nationale supérieure Mines-Télécom Lille Douai. Accessed January 17, 2021.
http://www.theses.fr/2019MTLD0005.
MLA Handbook (7th Edition):
Mehra, Bineet. “Design and optimisation of innovative electronic cooling heat sinks with enhanced thermal performances using numerical and experimental methods : Conception et optimisation de dissipateurs thermiques de refroidissement électronique innovants.” 2019. Web. 17 Jan 2021.
Vancouver:
Mehra B. Design and optimisation of innovative electronic cooling heat sinks with enhanced thermal performances using numerical and experimental methods : Conception et optimisation de dissipateurs thermiques de refroidissement électronique innovants. [Internet] [Doctoral dissertation]. Ecole nationale supérieure Mines-Télécom Lille Douai; 2019. [cited 2021 Jan 17].
Available from: http://www.theses.fr/2019MTLD0005.
Council of Science Editors:
Mehra B. Design and optimisation of innovative electronic cooling heat sinks with enhanced thermal performances using numerical and experimental methods : Conception et optimisation de dissipateurs thermiques de refroidissement électronique innovants. [Doctoral Dissertation]. Ecole nationale supérieure Mines-Télécom Lille Douai; 2019. Available from: http://www.theses.fr/2019MTLD0005
Delft University of Technology
13.
Van der Vegte, G.J.
The static strength of uniplanar and multiplanar tubular T- and X- joints.
Degree: 1995, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:429390cc-2b37-456d-941e-0e1e0b279658
;
urn:NBN:nl:ui:24-uuid:429390cc-2b37-456d-941e-0e1e0b279658
;
urn:NBN:nl:ui:24-uuid:429390cc-2b37-456d-941e-0e1e0b279658
;
http://resolver.tudelft.nl/uuid:429390cc-2b37-456d-941e-0e1e0b279658
Subjects/Keywords: welded tubular joints; static strength; circular hollow sections; experiments; numerical simulations; finite element analyses
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APA (6th Edition):
Van der Vegte, G. J. (1995). The static strength of uniplanar and multiplanar tubular T- and X- joints. (Doctoral Dissertation). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:429390cc-2b37-456d-941e-0e1e0b279658 ; urn:NBN:nl:ui:24-uuid:429390cc-2b37-456d-941e-0e1e0b279658 ; urn:NBN:nl:ui:24-uuid:429390cc-2b37-456d-941e-0e1e0b279658 ; http://resolver.tudelft.nl/uuid:429390cc-2b37-456d-941e-0e1e0b279658
Chicago Manual of Style (16th Edition):
Van der Vegte, G J. “The static strength of uniplanar and multiplanar tubular T- and X- joints.” 1995. Doctoral Dissertation, Delft University of Technology. Accessed January 17, 2021.
http://resolver.tudelft.nl/uuid:429390cc-2b37-456d-941e-0e1e0b279658 ; urn:NBN:nl:ui:24-uuid:429390cc-2b37-456d-941e-0e1e0b279658 ; urn:NBN:nl:ui:24-uuid:429390cc-2b37-456d-941e-0e1e0b279658 ; http://resolver.tudelft.nl/uuid:429390cc-2b37-456d-941e-0e1e0b279658.
MLA Handbook (7th Edition):
Van der Vegte, G J. “The static strength of uniplanar and multiplanar tubular T- and X- joints.” 1995. Web. 17 Jan 2021.
Vancouver:
Van der Vegte GJ. The static strength of uniplanar and multiplanar tubular T- and X- joints. [Internet] [Doctoral dissertation]. Delft University of Technology; 1995. [cited 2021 Jan 17].
Available from: http://resolver.tudelft.nl/uuid:429390cc-2b37-456d-941e-0e1e0b279658 ; urn:NBN:nl:ui:24-uuid:429390cc-2b37-456d-941e-0e1e0b279658 ; urn:NBN:nl:ui:24-uuid:429390cc-2b37-456d-941e-0e1e0b279658 ; http://resolver.tudelft.nl/uuid:429390cc-2b37-456d-941e-0e1e0b279658.
Council of Science Editors:
Van der Vegte GJ. The static strength of uniplanar and multiplanar tubular T- and X- joints. [Doctoral Dissertation]. Delft University of Technology; 1995. Available from: http://resolver.tudelft.nl/uuid:429390cc-2b37-456d-941e-0e1e0b279658 ; urn:NBN:nl:ui:24-uuid:429390cc-2b37-456d-941e-0e1e0b279658 ; urn:NBN:nl:ui:24-uuid:429390cc-2b37-456d-941e-0e1e0b279658 ; http://resolver.tudelft.nl/uuid:429390cc-2b37-456d-941e-0e1e0b279658
University of Queensland
14.
Bai, Tianhang.
Integrated geomechanical, geohydraulic and geological (3G) study of coal fines generation and migration.
Degree: School of Mechanical and Mining Engineering, 2019, University of Queensland
URL: http://espace.library.uq.edu.au/view/UQ:83827
Subjects/Keywords: Coal fines generation and migration; Numerical simulations; Dimensional analysis; Core flooding experiments; Permeability variations; Mathematical model; 0914 Resources Engineering and Extractive Metallurgy
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APA (6th Edition):
Bai, T. (2019). Integrated geomechanical, geohydraulic and geological (3G) study of coal fines generation and migration. (Thesis). University of Queensland. Retrieved from http://espace.library.uq.edu.au/view/UQ:83827
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Bai, Tianhang. “Integrated geomechanical, geohydraulic and geological (3G) study of coal fines generation and migration.” 2019. Thesis, University of Queensland. Accessed January 17, 2021.
http://espace.library.uq.edu.au/view/UQ:83827.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Bai, Tianhang. “Integrated geomechanical, geohydraulic and geological (3G) study of coal fines generation and migration.” 2019. Web. 17 Jan 2021.
Vancouver:
Bai T. Integrated geomechanical, geohydraulic and geological (3G) study of coal fines generation and migration. [Internet] [Thesis]. University of Queensland; 2019. [cited 2021 Jan 17].
Available from: http://espace.library.uq.edu.au/view/UQ:83827.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Bai T. Integrated geomechanical, geohydraulic and geological (3G) study of coal fines generation and migration. [Thesis]. University of Queensland; 2019. Available from: http://espace.library.uq.edu.au/view/UQ:83827
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
NSYSU
15.
Chen, Chun-Ho.
Study on The Application of FLOW-3D for Wave Energy Dissipation by a Porous Structure.
Degree: Master, Marine Environment and Engineering, 2012, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0911112-160600
► Wave is one of the most common dynamic factors in marine engineering. This is the major affecting factor in the design of structures and coastal…
(more)
▼ Wave is one of the most common dynamic factors in marine engineering. This is the major affecting factor in the design of structures and coastal engineering that wave affect the structure or the coast, so there are many topics about wave absorbing issues. In this paper, FLOW-3D modeling is implemented for wave interaction with porous structures, and comparing with experiment. This is very different between the results of models using the proposed method by the FLOW-3D User Manual to set drag coefficients of porous media and the results of
experiments. Therefore, to discuss the setting drag coefficients of porous media is one of this research project.
Configuration of this study, four different types of porous structures to explore the interaction with wave, the major categories: single, double and three-tier (two forms). FLOW-3D
simulations of wave boundary in this article is to simulate the wave plate to manufacture wave, FLOW-3D
simulations of wave with the previous studies are different with its built-in wave boundary. The results of simulation compare with experiment, and obtain water depth data both of them, and then programmatically wave analysis explore the differences between simulation and experiment.
The simulation results show that stroke set by the analog wave board need to reduce 10 percent of the original settings, and the simulation results are similar to experiment results. The differences between simulation and experiment are smaller when porous media parameter âbâ setting formula adjust to 0.03/D ( D is the particle diameter)and parameter âaâ setting formula changeless. Reducing wave of the four porous structures relate to the wave period. The wave period is bigger and more difficult to wave absorption, and the reflectivity is proportional to wave period.
Advisors/Committee Members: none (chair), none (chair), Chung-Pan Lee (committee member), none (chair), Yang-Yih Chen (chair).
Subjects/Keywords: porous media; reflectivity; numerical tank; experiments of hydraulic model
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APA (6th Edition):
Chen, C. (2012). Study on The Application of FLOW-3D for Wave Energy Dissipation by a Porous Structure. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0911112-160600
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Chen, Chun-Ho. “Study on The Application of FLOW-3D for Wave Energy Dissipation by a Porous Structure.” 2012. Thesis, NSYSU. Accessed January 17, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0911112-160600.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Chen, Chun-Ho. “Study on The Application of FLOW-3D for Wave Energy Dissipation by a Porous Structure.” 2012. Web. 17 Jan 2021.
Vancouver:
Chen C. Study on The Application of FLOW-3D for Wave Energy Dissipation by a Porous Structure. [Internet] [Thesis]. NSYSU; 2012. [cited 2021 Jan 17].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0911112-160600.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Chen C. Study on The Application of FLOW-3D for Wave Energy Dissipation by a Porous Structure. [Thesis]. NSYSU; 2012. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0911112-160600
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
16.
Emmerich, Michael T. M.
Single- and multi-objective
evolutionary design optimization assisted by gaussian random field
metamodels.
Degree: 2005, Technische Universität Dortmund
URL: http://hdl.handle.net/2003/21807
► In this thesis numerical optimization methods for single- and multi-objective design optimization with time-consuming computer experiments are studied in theory and practise. We show that…
(more)
▼ In this thesis
numerical
optimization methods for single- and multi-objective design
optimization with time-consuming computer
experiments are studied
in theory and practise. We show that the assistance by metamodeling
techniques (or: surrogates) can significantly accelerate
evolutionary (multi-objective) optimization algorithms (E(M)OA) in
the presence of time consuming evaluations. A further increase of
robustness can be achieved by taking confidence information for the
imprecise evaluations into account. Gaussian random field
metamodels, also referred to as Kriging techniques, can provide
such confidence information. The confidence information is used to
figure out ‘white spots’ in the functional landscape to be
explored. The thesis starts with a detailed discussion of
computational aspects related to the Kriging algorithm. Then,
algorithms for optimization with single objectives, constraints and
multiple objectives are introduced. For the latter, with the
S-metric selection EMOA (SMS-EMOA) a new powerful algorithm for
Pareto optimization is introduced, which outperforms established
techniques on standard benchmarks. The concept of a filter is
introduced to couple E(M)OA with metamodeling techniques. Various
filter concepts are compared, both by means of deducing their
properties theoretically and by
experiments on artificial
landscapes. For the latter studies we propose new analytical
indicators, like the inversion metric and the recall/precision
measure. Moreover, sufficient conditions for global convergence in
probability are established. Finally the practical benefit of the
new techniques is demonstrated by solving several industrial
optimization problems, including airfoil optimization,
solidification process design, metal forming, and electromagnetic
compatibility design and comparing the results to those obtained by
standard algorithms.
Advisors/Committee Members: Schwefel, H.-P..
Subjects/Keywords: Computer experiments;
Evolutionary algorithms; Kriging metamodels; Multicriteria
optimization; Numerical optimization; 004
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APA ·
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Export
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APA (6th Edition):
Emmerich, M. T. M. (2005). Single- and multi-objective
evolutionary design optimization assisted by gaussian random field
metamodels. (Thesis). Technische Universität Dortmund. Retrieved from http://hdl.handle.net/2003/21807
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Emmerich, Michael T M. “Single- and multi-objective
evolutionary design optimization assisted by gaussian random field
metamodels.” 2005. Thesis, Technische Universität Dortmund. Accessed January 17, 2021.
http://hdl.handle.net/2003/21807.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Emmerich, Michael T M. “Single- and multi-objective
evolutionary design optimization assisted by gaussian random field
metamodels.” 2005. Web. 17 Jan 2021.
Vancouver:
Emmerich MTM. Single- and multi-objective
evolutionary design optimization assisted by gaussian random field
metamodels. [Internet] [Thesis]. Technische Universität Dortmund; 2005. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/2003/21807.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Emmerich MTM. Single- and multi-objective
evolutionary design optimization assisted by gaussian random field
metamodels. [Thesis]. Technische Universität Dortmund; 2005. Available from: http://hdl.handle.net/2003/21807
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Windsor
17.
Maris, Christopher Joel Lyall.
Experimental determination of the forming limits of DP600
and AA5182 sheets in electrohydraulic free forming.
Degree: MA, Mechanical, Automotive, and Materials
Engineering, 2014, University of Windsor
URL: http://scholar.uwindsor.ca/etd/5130
► Electrohydraulic forming is a pulsed metal forming process that uses the discharge of electrical energy across a pair of electrodes submerged in fluid to…
(more)
▼ Electrohydraulic forming is a pulsed
metal forming process that uses the discharge of electrical energy
across a pair of electrodes submerged in fluid to form sheet metal.
Pulsed metal forming processes, including electrohydraulic forming,
have been shown to increase the formability of sheet metals, which
is of significant industrial interest. An experimental procedure
was developed to quantify the formability in electrohydraulic free
forming (EHFF) that is consistent with the quasi-static formability
assessment convention. Novel sheet metal specimen geometries were
created to quantify the formability across the entire minor strain
spectrum. The experimental EHFF forming limit curve (FLC) was
determined for both AA5182-O and DP600 sheets. Compared to their
respective quasi static FLCs, DP600 shows no formability
improvement in EHFF while AA5182-O shows formability improvement
over the entire range of minor strains including an 11% engineering
strain improvement at the plane strain intercept.
Numerical
modeling indicated that peak strain rates reach approximately 2500
to10,000 s-1 .
Advisors/Committee Members: Green, Daniel E..
Subjects/Keywords: Applied sciences; Electrohydraulic forming; Experiments; Formability; High strain-rate; Numerical model
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APA ·
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MLA ·
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CSE |
Export
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Manager
APA (6th Edition):
Maris, C. J. L. (2014). Experimental determination of the forming limits of DP600
and AA5182 sheets in electrohydraulic free forming. (Masters Thesis). University of Windsor. Retrieved from http://scholar.uwindsor.ca/etd/5130
Chicago Manual of Style (16th Edition):
Maris, Christopher Joel Lyall. “Experimental determination of the forming limits of DP600
and AA5182 sheets in electrohydraulic free forming.” 2014. Masters Thesis, University of Windsor. Accessed January 17, 2021.
http://scholar.uwindsor.ca/etd/5130.
MLA Handbook (7th Edition):
Maris, Christopher Joel Lyall. “Experimental determination of the forming limits of DP600
and AA5182 sheets in electrohydraulic free forming.” 2014. Web. 17 Jan 2021.
Vancouver:
Maris CJL. Experimental determination of the forming limits of DP600
and AA5182 sheets in electrohydraulic free forming. [Internet] [Masters thesis]. University of Windsor; 2014. [cited 2021 Jan 17].
Available from: http://scholar.uwindsor.ca/etd/5130.
Council of Science Editors:
Maris CJL. Experimental determination of the forming limits of DP600
and AA5182 sheets in electrohydraulic free forming. [Masters Thesis]. University of Windsor; 2014. Available from: http://scholar.uwindsor.ca/etd/5130
University of Windsor
18.
Maris, Christopher Joel Lyall.
Experimental determination of the forming limits of DP600 and AA5182 sheets in electrohydraulic free forming.
Degree: MA, Mechanical, Automotive, and Materials Engineering, 2014, University of Windsor
URL: https://scholar.uwindsor.ca/etd/5130
► Electrohydraulic forming is a pulsed metal forming process that uses the discharge of electrical energy across a pair of electrodes submerged in fluid to…
(more)
▼ Electrohydraulic forming is a pulsed metal forming process that uses the discharge of electrical energy across a pair of electrodes submerged in fluid to form sheet metal. Pulsed metal forming processes, including electrohydraulic forming, have been shown to increase the formability of sheet metals, which is of significant industrial interest. An experimental procedure was developed to quantify the formability in electrohydraulic free forming (EHFF) that is consistent with the quasi-static formability assessment convention. Novel sheet metal specimen geometries were created to quantify the formability across the entire minor strain spectrum. The experimental EHFF forming limit curve (FLC) was determined for both AA5182-O and DP600 sheets. Compared to their respective quasi static FLCs, DP600 shows no formability improvement in EHFF while AA5182-O shows formability improvement over the entire range of minor strains including an 11% engineering strain improvement at the plane strain intercept.
Numerical modeling indicated that peak strain rates reach approximately 2500 to10,000 s-1 .
Advisors/Committee Members: Green, Daniel E..
Subjects/Keywords: Applied sciences; Electrohydraulic forming; Experiments; Formability; High strain-rate; Numerical model
Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Maris, C. J. L. (2014). Experimental determination of the forming limits of DP600 and AA5182 sheets in electrohydraulic free forming. (Masters Thesis). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/5130
Chicago Manual of Style (16th Edition):
Maris, Christopher Joel Lyall. “Experimental determination of the forming limits of DP600 and AA5182 sheets in electrohydraulic free forming.” 2014. Masters Thesis, University of Windsor. Accessed January 17, 2021.
https://scholar.uwindsor.ca/etd/5130.
MLA Handbook (7th Edition):
Maris, Christopher Joel Lyall. “Experimental determination of the forming limits of DP600 and AA5182 sheets in electrohydraulic free forming.” 2014. Web. 17 Jan 2021.
Vancouver:
Maris CJL. Experimental determination of the forming limits of DP600 and AA5182 sheets in electrohydraulic free forming. [Internet] [Masters thesis]. University of Windsor; 2014. [cited 2021 Jan 17].
Available from: https://scholar.uwindsor.ca/etd/5130.
Council of Science Editors:
Maris CJL. Experimental determination of the forming limits of DP600 and AA5182 sheets in electrohydraulic free forming. [Masters Thesis]. University of Windsor; 2014. Available from: https://scholar.uwindsor.ca/etd/5130
19.
Llop Sayson, Javier Pelayo.
Numerical Simulation Assessment of a Ship Dynamic Behavior Against a SSPA Model Test
.
Degree: Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper, 2019, Chalmers University of Technology
URL: http://hdl.handle.net/20.500.12380/300298
► Shipping carbon emission impact will increase in the upcoming years, achieving more than 3% of CO2 world emissions by 2030. It is not unthinkable of…
(more)
▼ Shipping carbon emission impact will increase in the upcoming years, achieving more than 3% of CO2 world emissions by 2030. It is not unthinkable of incoming regulations limiting these emissions. To affront this challenge, significant changes in ship performance and construction are heavily needed to minimize energy consumption. For that reason, there is a stronger need for more efficient and simplified methods in the prediction and analysis of ship energy efficiency and dynamic behavior. This thesis emphasizes the analysis and assessment of a ship’s dynamic response to different sea states. The objective of this thesis is to compare a state-of-the-art simulation model with a segmented model test carried out at the SSPA wave basin. The simulation model is created for its use in DNV GL’s SESAM package software which assumed a rigid body motions model. SESAM GeniE has been used for the model calibrations, whereas Wasim SESAM is used in the seakeeping simulations. The assessment of the model consisted of the use of modal analysis for the structural behaviour and seakeeping analysis for the wave loads response. The wet vibration analysis gave an accurate result of the segmented model, concluding that the numerical model structure captures the behavior of the hammer test. The seakeeping simulations have proven good predictions on shear and bending moments, where the mean value is within 7% of the experimental value. It is concluded that with the current methodology and software, there is a satisfactory accuracy in the use of rigid numerical model to capture the vertical load behavior of a segmented experimental model in moderate sea states.
Subjects/Keywords: experiments; numerical simulation; seakeeping; segmented model; wave basin
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APA ·
Chicago ·
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Llop Sayson, J. P. (2019). Numerical Simulation Assessment of a Ship Dynamic Behavior Against a SSPA Model Test
. (Thesis). Chalmers University of Technology. Retrieved from http://hdl.handle.net/20.500.12380/300298
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Llop Sayson, Javier Pelayo. “Numerical Simulation Assessment of a Ship Dynamic Behavior Against a SSPA Model Test
.” 2019. Thesis, Chalmers University of Technology. Accessed January 17, 2021.
http://hdl.handle.net/20.500.12380/300298.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Llop Sayson, Javier Pelayo. “Numerical Simulation Assessment of a Ship Dynamic Behavior Against a SSPA Model Test
.” 2019. Web. 17 Jan 2021.
Vancouver:
Llop Sayson JP. Numerical Simulation Assessment of a Ship Dynamic Behavior Against a SSPA Model Test
. [Internet] [Thesis]. Chalmers University of Technology; 2019. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/20.500.12380/300298.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Llop Sayson JP. Numerical Simulation Assessment of a Ship Dynamic Behavior Against a SSPA Model Test
. [Thesis]. Chalmers University of Technology; 2019. Available from: http://hdl.handle.net/20.500.12380/300298
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
20.
Massmeyer, Anna.
Thermal instabilities in a yield-stress fluid : from the laboratory to the planetary scale : Instabilités thermiques dans un fluide à seuil : de l'échelle du laboratoire à celle de la planète.
Degree: Docteur es, Physique, 2013, Université Paris-Sud – Paris XI
URL: http://www.theses.fr/2013PA112068
► Des panaches sont connus pour migrer à travers le manteau ductile et quasi-Newtonien ; alors que les dikes se fracturent et se propagent dans la…
(more)
▼ Des panaches sont connus pour migrer à travers le manteau ductile et quasi-Newtonien ; alors que les dikes se fracturent et se propagent dans la lithosphère solide. Cependant, la lithosphère est en fait visco-élastique. Afin de déterminer ce qui se passe dans ce cas complexe, nous avons réalisé une étude expérimentale et numérique sur le développement de panaches thermiques dans des solutions aqueuses de Carbopol, un gel de polymères formant un réseau continu d'éponges microscopiques. Ce fluide est rhéofluidifiant et présente un seuil de contrainte σ₀, de sorte que l'écoulement ne se produit que si la contrainte locale dépasse cette valeur critique σ₀. En dessous de cette valeur, le fluide agit comme un solide élastique. Les propriétés rhéologiques des solutions peuvent être systématiquement ajustées en variant la concentration de Carbopol. Le dispositif consiste en une source locale de chaleur de puissance constante placée au centre d'une cuve cubique. Selon la valeur du rapport entre la contrainte d'origine thermique et la contrainte seuil, Y₀, on peut observer trois régimes différents. A faible Y₀<Yc₁, aucun mouvement n'est détecté ; tandis que pour Yc₁<Y₀<Yc₂ une cellule se développe, puis évolue vers un panache pour Y₀>Yc₂. Nous montrons que les paramètres critiques (Yc₁,Yc₂) dépendent fortement de la géométrie du chauffage. Des mesures simultanées de température et de champs de vitesse montrent que la morphologie du panache ressemble à un doigt, contrairement à la forme de champignon rencontrée dans les fluides newtoniens. Utilisant des
simulations numériques avec une description purement visqueuse, où la rhéologie du fluide est décrite par un modèle de Herschel-Bulkley régularisé, sont suffisantes pour rendre compte de la dynamique du panache. Une étude détaillée des paramètres indiquent que la dynamique du panache est gouvernée par la compétition entre la contrainte seuil, la contrainte induite par la flottabilité et les contraintes visqueuses. Nous avons identifié deux paramètres adimensionnés : le paramètre seuil Ψ comparant la contrainte induite par la flottabilité et la contrainte seuil, et le nombre de Bingham Bi comparant la contrainte seuil et les contraintes visqueuses. Un panache ne peut s'élever que si les deux paramètres sont supercritiques, i.e. la contrainte induite par la flottabilité et les contraintes visqueuses sont plus importantes que la contrainte seuil. Par conséquent, le panache peut s'arrêter avant d'atteindre la surface. Des lois d'échelles dans le conduit du panache ont été déterminées pour la vitesse, la température et la taille de la région cisaillée en régime permanent. Elles décrivent raisonnablement le comportement du conduit bien que seul l'effet rhéofluidifiant soit pris en compte. L'application de ces paramètres adimensionnés à la Terre contraignent significativement la limite de plasticité du manteau et de la lithosphère. La contrainte seuil maximale qui permet à une instabilité thermique de pénétrer dans la lithosphère ou le manteau supérieur est entre 100 kPa et 100 MPa, et…
Advisors/Committee Members: Davaille, Anne (thesis director).
Subjects/Keywords: Convection; Carbopol; Diapirisme; Panache; Simulations numériques; Expériences de laboratoire; Modèle de Herschel-Bulkley; Contrainte seuil; Convection; Carbopol; Diapirism; Plume; Numerical simulations; Laboratory experiments; Herschel-Bulkley model; Yield-stress
…Morphology . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
4. Numerical Simulations
4.1… …4.2.3. The Numerical Model and Boundary Conditions
4.2.4. The Laboratory Experiments… …in
the numerical simulations using Byerlee’s law where the yield stress is defined as
σY… …2.2.3. Development of a 3D Isotherm Visualization Method
2.3. Numerical Simulation… …2.4.4. Properties of Fluids used in the Plume Experiments . . . . . . . . .
2.4.4.1…
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APA (6th Edition):
Massmeyer, A. (2013). Thermal instabilities in a yield-stress fluid : from the laboratory to the planetary scale : Instabilités thermiques dans un fluide à seuil : de l'échelle du laboratoire à celle de la planète. (Doctoral Dissertation). Université Paris-Sud – Paris XI. Retrieved from http://www.theses.fr/2013PA112068
Chicago Manual of Style (16th Edition):
Massmeyer, Anna. “Thermal instabilities in a yield-stress fluid : from the laboratory to the planetary scale : Instabilités thermiques dans un fluide à seuil : de l'échelle du laboratoire à celle de la planète.” 2013. Doctoral Dissertation, Université Paris-Sud – Paris XI. Accessed January 17, 2021.
http://www.theses.fr/2013PA112068.
MLA Handbook (7th Edition):
Massmeyer, Anna. “Thermal instabilities in a yield-stress fluid : from the laboratory to the planetary scale : Instabilités thermiques dans un fluide à seuil : de l'échelle du laboratoire à celle de la planète.” 2013. Web. 17 Jan 2021.
Vancouver:
Massmeyer A. Thermal instabilities in a yield-stress fluid : from the laboratory to the planetary scale : Instabilités thermiques dans un fluide à seuil : de l'échelle du laboratoire à celle de la planète. [Internet] [Doctoral dissertation]. Université Paris-Sud – Paris XI; 2013. [cited 2021 Jan 17].
Available from: http://www.theses.fr/2013PA112068.
Council of Science Editors:
Massmeyer A. Thermal instabilities in a yield-stress fluid : from the laboratory to the planetary scale : Instabilités thermiques dans un fluide à seuil : de l'échelle du laboratoire à celle de la planète. [Doctoral Dissertation]. Université Paris-Sud – Paris XI; 2013. Available from: http://www.theses.fr/2013PA112068
Delft University of Technology
21.
Droutsas, Athanasios (author).
Effect of stochastic material properties on the structural response of laminated composite materials: following the building block approach.
Degree: 2018, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:4f6ba7f4-23ea-4d94-9765-834128f0bb51
► This report, which from now and onwards will be called the main body of the thesis, covers the core of the problem that has to…
(more)
▼ This report, which from now and onwards will be called the main body of the thesis, covers the core of the problem that has to be solved. Generally, the aim of this thesis is to investigate a laminated composite’s structural response, made of FRP, when its material properties are assumed stochastic instead of deterministic. The materials shown in this thesis are investigated as part of a bigger project that concerns the construction of several Mine Counter Measure Vessels. In this document, the main focus is given on the results of experiments and/or analytical calculations whereas the theories/methods used to extract these results are presented in the supporting document. As a result, readers that are familiar with statistics, classical lamination theory, FEA modeling among others, can easily read this report without coming across knowledge that they already have. In general, this document covers the writer’s contribution to academics whereas the supporting document gives an extensive explanation on what was used in this document.
Offshore and Dredging Engineering
Advisors/Committee Members: Kaminski, Mirek (mentor), Zarouchas, Dimitrios (graduation committee), Maljaars, Pieter (graduation committee), Schraven, Daan (graduation committee), Broekhuijsen, J. (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: Laminated composites; Stochastic Analysis; Coupon Experiments; Panel Experiments; Ansys mechanical; Numerical; Project Planning; Monte Carlo; Latin Hypercube; Material Properties; Ultimate Strength
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APA (6th Edition):
Droutsas, A. (. (2018). Effect of stochastic material properties on the structural response of laminated composite materials: following the building block approach. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:4f6ba7f4-23ea-4d94-9765-834128f0bb51
Chicago Manual of Style (16th Edition):
Droutsas, Athanasios (author). “Effect of stochastic material properties on the structural response of laminated composite materials: following the building block approach.” 2018. Masters Thesis, Delft University of Technology. Accessed January 17, 2021.
http://resolver.tudelft.nl/uuid:4f6ba7f4-23ea-4d94-9765-834128f0bb51.
MLA Handbook (7th Edition):
Droutsas, Athanasios (author). “Effect of stochastic material properties on the structural response of laminated composite materials: following the building block approach.” 2018. Web. 17 Jan 2021.
Vancouver:
Droutsas A(. Effect of stochastic material properties on the structural response of laminated composite materials: following the building block approach. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Jan 17].
Available from: http://resolver.tudelft.nl/uuid:4f6ba7f4-23ea-4d94-9765-834128f0bb51.
Council of Science Editors:
Droutsas A(. Effect of stochastic material properties on the structural response of laminated composite materials: following the building block approach. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:4f6ba7f4-23ea-4d94-9765-834128f0bb51
NSYSU
22.
Cheng, Ming-hung.
Laboratory and Numerical Study on Evolution of Interfacial Solitary Wave across Pseudo Slope-Shelf.
Degree: PhD, Marine Environment and Engineering, 2011, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0619111-142646
► While shoaling from deepwater in a stratified ocean, an interfacial solitary wave (ISW) may experience waveform inversion on a continental margin. Although many oceanographers have…
(more)
▼ While shoaling from deepwater in a stratified ocean, an interfacial solitary wave (ISW) may experience waveform inversion on a continental margin. Although many oceanographers have believed that the inversion from depression to elevation may commence at the turning point where the upper and bottom layers are equal in depth, this phenomenon has not been fully verified in field observations nor in a laboratory. In this study, a series of laboratory
experiments and
numerical modeling were conducted on the evolution of an ISW of depression across uniform slope joining a horizontal plateau which resembles pseudo slope-shelf topography, in order to clarify this fascinating phenomenon and the variations of wave properties associated with the process.
In the laboratory
experiments, a depression ISW was produced by a collapse mechanism in a stratified two-layer fluid system within a steel-framed wave flume (12 m long, 0.7 m high by 0.5 m wide) at the National Sun Yat-sen University in Taiwan. The fluid density in the upper (fresh) and bottom (brine) layers was 996 and 1030 kg/m3, respectively. A series of
experiments were conducted upon varying the magnitude of the most important physical factors (i.e., nominal thickness of pycnocline, depth ratio between upper and bottom layer, front gradient and shape of pseudo slope-shelf), from which the results are now discussed in four separate chapters in this thesis.
Present laboratory results indicate that the process of waveform inversion took place after an ISW had experienced internal run-down, hydraulic jump, vortex motion and surge-up on the front slope, prior to its propagation onto the plateau. Moreover, the fundamental wave period of leading wave on the plateau was significantly smaller than that in the preceding sections on the front slope and the incident stage earlier, thus representing frequency downshift. Amongst the factors involved, the depth ratio between the upper and bottom layer was the most significant one for waveform inversion. Only when the upper layer was thicker than the bottom layer on the plateau of pseudo slope-shelf, waveform inversion could occur, besides the length of the plateau. On the other hand, the front gradient and shape of pseudo slope-shelf also affected the magnitude of the transmitted wave over the plateau as the wave across this specific topography. In the case of a steeper front gradient, waveform inversion became insignificant due to stronger wave reflection and intense energy dissipation caused by turbulent mixing while a depression ISW propagated over a slope-shelf; particularly against a submerged vertical cliff. As a depression ISW across pseudo slope-shelf with short plateau, intense wave breaking might occur again with vortex motion at its rear end as the newly inversed waveform reentering deep water. In this region, the upper layer was smaller than the bottom layer, hence it could not support the continuous existence of an ISW in elevation. Again, energy dissipation occurred due to turbulent mixing beyond the rear end of a short…
Advisors/Committee Members: Ming-Kuang Hsu (chair), Ying-Jang Yang (chair), Yu-Huai Wang (chair), Tswen-Yung Tang (chair), John Rong Chung Hsu (committee member).
Subjects/Keywords: waveform inversion; flow field; slope-shelf; laboratory experiments; numerical model; Interfacial solitary wave
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APA ·
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APA (6th Edition):
Cheng, M. (2011). Laboratory and Numerical Study on Evolution of Interfacial Solitary Wave across Pseudo Slope-Shelf. (Doctoral Dissertation). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0619111-142646
Chicago Manual of Style (16th Edition):
Cheng, Ming-hung. “Laboratory and Numerical Study on Evolution of Interfacial Solitary Wave across Pseudo Slope-Shelf.” 2011. Doctoral Dissertation, NSYSU. Accessed January 17, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0619111-142646.
MLA Handbook (7th Edition):
Cheng, Ming-hung. “Laboratory and Numerical Study on Evolution of Interfacial Solitary Wave across Pseudo Slope-Shelf.” 2011. Web. 17 Jan 2021.
Vancouver:
Cheng M. Laboratory and Numerical Study on Evolution of Interfacial Solitary Wave across Pseudo Slope-Shelf. [Internet] [Doctoral dissertation]. NSYSU; 2011. [cited 2021 Jan 17].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0619111-142646.
Council of Science Editors:
Cheng M. Laboratory and Numerical Study on Evolution of Interfacial Solitary Wave across Pseudo Slope-Shelf. [Doctoral Dissertation]. NSYSU; 2011. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0619111-142646
Iowa State University
23.
Young, Nathan Lee.
An integrated framework for quantifying scale-dependent groundwater flow and solute transport in fractured till using field data and numerical modeling.
Degree: 2019, Iowa State University
URL: https://lib.dr.iastate.edu/etd/17371
► Previous work characterizing till in Iowa has identified the extensive fracture networks that can reach depths of 30 m. Preferential flow in those fractures can…
(more)
▼ Previous work characterizing till in Iowa has identified the extensive fracture networks that can reach depths of 30 m. Preferential flow in those fractures can result in groundwater velocities that are 1-4 orders of magnitude higher than those in the matrix and facilitate rapid advective transport. The effects of till fractures have been quantified by column tracer tests in the laboratory, but their effects on flow and transport at larger scales (e.g., field, watershed) are unknown, primarily due to the lack of data on fracture properties and a computationally-feasible method for including fractures in large-scale models. This research provides a methodology to address this problem and allow fractures to be incorporated into models at larger scales. Field fracture measurements, quantification of the Representative Elementary Volume (REV), development of a hydraulic conductivity (K) tensor estimation program (FracKFinder) and numerical modeling with the dual-continuum (D-C) model in HydroGeoSphere (HGS) were used to characterize the hydraulic properties of the matrix and fractures of the late Wisconsin Dows Formation till in central Iowa.
Determining bulk direction K values of ten different volumes of fractured till, ranging from 0.125 m3 to 7 m3, was the first step in this analysis. HGS simulations suggested that the REV of the Dows Formation ranges from 4 to 5 m3 at depths of one m where fractures are densest (P32 ≥ 27.5 m2/m3) and most transmissive, to 2 to 3 m3 at depths of 3.3 m where fracture transmissivity and fracture density are lower (P32 ≤ 24.4 m2/m3). A MATLAB program, FracKfinder, was used to compute a six-component K tensor from the REV. The resulting tensors showed that the till matrix is approximately anisotropic, while the fracture network had slightly greater (40 to 60 percent) K values in the z-direction, due to the predominantly vertical orientation of the fractures. Using the tensors, a D-C simulation of a previous large-column tracer experiment showed superior agreement to other well-documented modeling approaches (i.e., equivalent porous media; EPM; and discrete fracture network-matrix; DFM-M) with simulation times of under eight seconds. Sensitivity analysis using PEST showed that parameters K and porosity associated with the matrix are the most important to constrain with field data. Fracture spacing was shown to be important for computing input parameters for the second (fracture) continuum in the D-C model. When input parameters are taken from site-specific field and laboratory data, the D-C model is able to predict the experimental results with a high degree of accuracy (modified index of agreement > 0.95). Additionally, the ability of the D-C model to calibrate to empirically- or theoretically-derived parameters without good initial parameter estimates suggests that the D-C model is capturing the physics of groundwater flow and solute transport in fractured till.
Modeling results were supported by laboratory data from bromide tracer experiments conducted on samples (16-cm-wide by…
Subjects/Keywords: column experiments; groundwater; hydrogeosphere; numerical modeling; till fractures; upscaling; Environmental Sciences; Geology
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APA ·
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APA (6th Edition):
Young, N. L. (2019). An integrated framework for quantifying scale-dependent groundwater flow and solute transport in fractured till using field data and numerical modeling. (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/etd/17371
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Young, Nathan Lee. “An integrated framework for quantifying scale-dependent groundwater flow and solute transport in fractured till using field data and numerical modeling.” 2019. Thesis, Iowa State University. Accessed January 17, 2021.
https://lib.dr.iastate.edu/etd/17371.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Young, Nathan Lee. “An integrated framework for quantifying scale-dependent groundwater flow and solute transport in fractured till using field data and numerical modeling.” 2019. Web. 17 Jan 2021.
Vancouver:
Young NL. An integrated framework for quantifying scale-dependent groundwater flow and solute transport in fractured till using field data and numerical modeling. [Internet] [Thesis]. Iowa State University; 2019. [cited 2021 Jan 17].
Available from: https://lib.dr.iastate.edu/etd/17371.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Young NL. An integrated framework for quantifying scale-dependent groundwater flow and solute transport in fractured till using field data and numerical modeling. [Thesis]. Iowa State University; 2019. Available from: https://lib.dr.iastate.edu/etd/17371
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
24.
Dellinger, Guilhem.
Etude expérimentale et optimisation des performances hydrauliques des vis d'Archimède utilisées dans les micro centrales hydroélectriques : Experimental study and performance optimization of Archimedean screw turbine used in micro hydroelectric plants.
Degree: Docteur es, Génie civil, 2015, Université de Strasbourg
URL: http://www.theses.fr/2015STRAD046
► Le potentiel de production d'hydroélectricité à l'aide de micro centrales hydroélectriques est sous-exploité en Europe. L'exploitation de petites chutes d'eau, à l'aide des vis d'Archimède,…
(more)
▼ Le potentiel de production d'hydroélectricité à l'aide de micro centrales hydroélectriques est sous-exploité en Europe. L'exploitation de petites chutes d'eau, à l'aide des vis d'Archimède, est un moyen de production d'énergie renouvelable récent et en voie de développement. Cette thèse étudie les performances hydrauliques de ce type de turbine. Une première partie du travail a porté sur la mise en place d'un dispositif expérimental, à échelle réduite, permettant de tester pour des conditions hydrauliques et des paramètres géométriques variés les performances hydrauliques d'une vis d'Archimède. Un modèle théorique semi-analytique permettant de déterminer les performances de la vis a été développé puis validé à l'aide des résultats expérimentaux. Les écoulements complexes au sein de cette turbine sont étudiés par le biais d'une modélisation numérique 3D instationnaire, validée expérimentalement. La compréhension de la structure de l'écoulement a alors permis de développer un nouveau modèle théorique permettant de déterminer avec plus de précision le débit de fuite qui est à l'origine d'une perte significative de rendement. Ces résultats permettent d'envisager l'implémentation d'un modèle de dimensionnement industriel.
The potential for hydropower generation using micro-hydro plants is still under exploited in Europe. The Archimede Screw Generators are a growing technology convenient for low-head hydraulic sites. This thesis studies the hydraulic performance of this turbine. The first part of thiswork presents an experimental device using a laboratory screw scale. This device allows to test screw performance for various hydraulic conditions and geometrical parameters. A theoretical model predicting the screw performance has then been developed and validated with experimental results.The complex flows occurring within the screw are studied thanks to 3D and unsteady numerical simulations. The numerical results are validated experimentally. The insights provided on the flow structure permit to develop a new leakage model. These leakages are a major source of efficiency loss. Eventually, all these results will allow the implementation of an industrial dimensioning model.
Advisors/Committee Members: Ghenaim, Abdellah (thesis director), Terfous, Abdelali (thesis director).
Subjects/Keywords: Micro Centrale Hydroélectrique; Vis d'Archimède; Expérimentations; Modélisation; Simulation numérique; Mirco-hydro Plants; Archimedean Screw; Experiments; Modelisation; Numerical simulation; 532.5; 621.2
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APA ·
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Export
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Manager
APA (6th Edition):
Dellinger, G. (2015). Etude expérimentale et optimisation des performances hydrauliques des vis d'Archimède utilisées dans les micro centrales hydroélectriques : Experimental study and performance optimization of Archimedean screw turbine used in micro hydroelectric plants. (Doctoral Dissertation). Université de Strasbourg. Retrieved from http://www.theses.fr/2015STRAD046
Chicago Manual of Style (16th Edition):
Dellinger, Guilhem. “Etude expérimentale et optimisation des performances hydrauliques des vis d'Archimède utilisées dans les micro centrales hydroélectriques : Experimental study and performance optimization of Archimedean screw turbine used in micro hydroelectric plants.” 2015. Doctoral Dissertation, Université de Strasbourg. Accessed January 17, 2021.
http://www.theses.fr/2015STRAD046.
MLA Handbook (7th Edition):
Dellinger, Guilhem. “Etude expérimentale et optimisation des performances hydrauliques des vis d'Archimède utilisées dans les micro centrales hydroélectriques : Experimental study and performance optimization of Archimedean screw turbine used in micro hydroelectric plants.” 2015. Web. 17 Jan 2021.
Vancouver:
Dellinger G. Etude expérimentale et optimisation des performances hydrauliques des vis d'Archimède utilisées dans les micro centrales hydroélectriques : Experimental study and performance optimization of Archimedean screw turbine used in micro hydroelectric plants. [Internet] [Doctoral dissertation]. Université de Strasbourg; 2015. [cited 2021 Jan 17].
Available from: http://www.theses.fr/2015STRAD046.
Council of Science Editors:
Dellinger G. Etude expérimentale et optimisation des performances hydrauliques des vis d'Archimède utilisées dans les micro centrales hydroélectriques : Experimental study and performance optimization of Archimedean screw turbine used in micro hydroelectric plants. [Doctoral Dissertation]. Université de Strasbourg; 2015. Available from: http://www.theses.fr/2015STRAD046
25.
De Oliveira Campos, Leandro Dijon.
Mass transfer coefficients across dynamic liquid steel/slag interface : Identification des coefficients de transfert de masse à travers d’une interface acier liquide/laitier liquide dynamique.
Degree: Docteur es, Mécanique, 2017, Bordeaux
URL: http://www.theses.fr/2017BORD0554
► Afin de prédire l’évolution de la composition chimique du laitier dans différents procédés sidérurgiques, un modèle CFD a été développé. Les coefficients de transfert de…
(more)
▼ Afin de prédire l’évolution de la composition chimique du laitier dans différents procédés sidérurgiques, un modèle CFD a été développé. Les coefficients de transfert de masse sont estimés à partir des modèles basés sur les paramètres physico-chimiques et hydrodynamiques, comme par exemple la diffusivité des espèces chimiques et la divergence de l’interface. Ces modèles ont été développé pour la prédiction du transfert gaz-liquide où le les nombres de Schmidt (Sc=ν⁄D) sont relativement faible (Sc≈200). Par contre, les procédés industriels ont un nombre de Sc considérablement plus importante, de l’ordre de 103 à 104. Pour évaluer la pertinence de ces modèles, l’hydrodynamique au voisinage d’une interface liquide-liquide a été étudiée. Un modèle CFD et des mesures par l’anémométrie laser (LDA) ont été utilisés pour calculer et valider les champs de vitesse d’une maquette à eau d’une lingotière de coulée continue (CC).Le modèle de transfert de masse d’une lingotière de coulée continu industriel nous a montré que les coefficients de transfert de masse ne sont pas distribués de manière homogène, et les propriétés physiques du laitier ne doivent pas y être non plus. Cette distribution non-homogène a été confirmée par des essais physiques. Les écoulements calculés numériquement ont été utilisé pour prédire les coefficients de transfert de masse entre les deux phases liquide. Ces paramètres seront utilisés comme donnée d’entré pour un modèle de thermodynamique afin de prédire l’évolution de la composition chimique du laitier.
In order to characterize the mass transfer coefficients (MTC) of different species across liquid steel/slag interface, a multiphase Computational Fluid Dynamic (CFD) model was developed. MTC’s are estimated from models based on physicochemical and hydrodynamic parameters, such as mass diffusivity, interface shear and divergence strength. These models were developed for gas-liquid interactions with relative low Schmidt (Sc=ν⁄D) numbers (Sc≈200). However, the industrial processes involve mass transfer of chemical species with Sc number ranging from 103 to 104. To evaluate the applicability of these existing models, the fluid flow in the vicinity of a liquid/liquid interface is investigated. Computational Fluid Dynamic (CFD) and Laser Doppler Anemometry (LDA) were used to calculate and measure the velocity field on a continuous casting (CC) water model configuration. The work provides new insights and original measures to understand the fluid flow near liquid-liquid interfaces.The mass transfer model of an industrial continuous casting mold showed that the mass transfer coefficients are not homogeneously distributed, and slag properties should follow this trend. This non-homogeneity was confirmed by physical experiments performed with a water model of a CC configuration and its CFD representation. The calculated flow was used to predict the MTC and the interface area between phases, since the interface is constantly moving. These parameters will be the input of thermodynamic models to predict slag…
Advisors/Committee Members: Caltagirone, Jean-Paul (thesis director), Vincent, Stéphane (thesis director).
Subjects/Keywords: Transfert de masse; Interface; Écoulement multiphasique; Simulation numérique; CFD; Mass transfer; Interface; Multiphase flow; Numerical simulation; CFD; Experiments
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APA (6th Edition):
De Oliveira Campos, L. D. (2017). Mass transfer coefficients across dynamic liquid steel/slag interface : Identification des coefficients de transfert de masse à travers d’une interface acier liquide/laitier liquide dynamique. (Doctoral Dissertation). Bordeaux. Retrieved from http://www.theses.fr/2017BORD0554
Chicago Manual of Style (16th Edition):
De Oliveira Campos, Leandro Dijon. “Mass transfer coefficients across dynamic liquid steel/slag interface : Identification des coefficients de transfert de masse à travers d’une interface acier liquide/laitier liquide dynamique.” 2017. Doctoral Dissertation, Bordeaux. Accessed January 17, 2021.
http://www.theses.fr/2017BORD0554.
MLA Handbook (7th Edition):
De Oliveira Campos, Leandro Dijon. “Mass transfer coefficients across dynamic liquid steel/slag interface : Identification des coefficients de transfert de masse à travers d’une interface acier liquide/laitier liquide dynamique.” 2017. Web. 17 Jan 2021.
Vancouver:
De Oliveira Campos LD. Mass transfer coefficients across dynamic liquid steel/slag interface : Identification des coefficients de transfert de masse à travers d’une interface acier liquide/laitier liquide dynamique. [Internet] [Doctoral dissertation]. Bordeaux; 2017. [cited 2021 Jan 17].
Available from: http://www.theses.fr/2017BORD0554.
Council of Science Editors:
De Oliveira Campos LD. Mass transfer coefficients across dynamic liquid steel/slag interface : Identification des coefficients de transfert de masse à travers d’une interface acier liquide/laitier liquide dynamique. [Doctoral Dissertation]. Bordeaux; 2017. Available from: http://www.theses.fr/2017BORD0554
26.
Bignonnet, François.
Caractérisation expérimentale et modélisation micro-mécanique de la perméabilité et la résistance de roches argileuses : Experimental characterization and multi-scale modeling of the permeability and the strength of mudrocks.
Degree: Docteur es, Structures et Matériaux, 2014, Université Paris-Est
URL: http://www.theses.fr/2014PEST1060
► Ce mémoire s'intéresse aux propriétés de transfert, de résistance et de plasticité de roches argileuses. Deux enjeux industriels directs sont la détermination du potentiel de…
(more)
▼ Ce mémoire s'intéresse aux propriétés de transfert, de résistance et de plasticité de roches argileuses. Deux enjeux industriels directs sont la détermination du potentiel de production de gaz naturel des roches mères et de la capacité de rétention des roches de couvertures utilisées pour les stockages de gaz ou de déchets en milieu souterrain. Dans un premier temps, la perméabilité est décrite comme résultant de l'homogénéisation de l'écoulement d'un fluide visqueux dans le réseau poreux. Un cadre variationnel analogue à celui de Hashin et Shtrikman en élasticité est établi et mis à profit pour proposer une méthode numérique basée sur la Transformée de Fourier Rapide (FFT) pour le calcul efficace de bornes sur la perméabilité à partir de représentations tridimensionnelles voxelisées de milieux poreux. Par ailleurs, des techniques d'homogénéisation analytiques basées sur la définition de cellules perméables équivalentes sont proposées pour fournir des briques élémentaires pour la modélisation micro-mécanique de la perméabilité.Le phénomène de glissement du gaz aux parois est considéré pour rendre compte quantitativement d'effets du type Klinkenberg sur la perméabilité au gaz. L'effet d'une saturation partielle du réseau poreux sur la perméabilité et la pression de percée sont étudiés dans le cas de morphologies particulières des pores. En parallèle, une campagne expérimentale est conduite sur différentes roches argileuses issues de forages pour caractériser leur porosité et leur perméabilité sous diverses conditions de confinement mécanique et desaturation partielle en eau. Dans un second temps, les capacités de résistance sont étudiées sous hypothèse de rupture ductile. Une méthode numérique efficace basée sur la FFT est proposée pour encadrer par l'extérieur le domaine de résistance de milieux hétérogènes à géométrie complexe. D'autre part, une modélisation analytique à trois échelles de la résistance d'un matériau granulaire renforcé par inclusions rigides avec interfaces imparfaites est présentée. Enfin, une relecture élasto-plastique de ce modèle de résistance a abouti à un modèle purement micro-mécanique, dont l'interprétation macroscopique est analogue au modèle Cam-clay, avec écrouissage par changement de porosité et ligne d'états critiques
This thesis is focused on the strength, plasticity and transport properties of mudrocks. Two industrial applications are the shale gas production and the underground gas or waste storage. In a first part, the permeability is described as resulting from the homogenisation of the flow of a Newtonian fluid within the pore space. A Hashin-Shtrikman like framework is derived for the permeability upscaling and used to propose a FFT-based numerical method for the efficient computation of bounds on the permeability, directly compatible with a voxelised representation of the pore space. As an alternative, analytic homogenisation techniques based on the definition of equivalent permeable cells are developed to provide building blocks for the micro-mechanical modelling of…
Advisors/Committee Members: Dormieux, Luc (thesis director).
Subjects/Keywords: Roches argileuses; Multi-échelle; Expérimentation; Perméabilité; Résistance; Simulation numérique; Mudrocks; Multi-scale; Experiments; Permeability; Strength; Numerical simulation
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APA (6th Edition):
Bignonnet, F. (2014). Caractérisation expérimentale et modélisation micro-mécanique de la perméabilité et la résistance de roches argileuses : Experimental characterization and multi-scale modeling of the permeability and the strength of mudrocks. (Doctoral Dissertation). Université Paris-Est. Retrieved from http://www.theses.fr/2014PEST1060
Chicago Manual of Style (16th Edition):
Bignonnet, François. “Caractérisation expérimentale et modélisation micro-mécanique de la perméabilité et la résistance de roches argileuses : Experimental characterization and multi-scale modeling of the permeability and the strength of mudrocks.” 2014. Doctoral Dissertation, Université Paris-Est. Accessed January 17, 2021.
http://www.theses.fr/2014PEST1060.
MLA Handbook (7th Edition):
Bignonnet, François. “Caractérisation expérimentale et modélisation micro-mécanique de la perméabilité et la résistance de roches argileuses : Experimental characterization and multi-scale modeling of the permeability and the strength of mudrocks.” 2014. Web. 17 Jan 2021.
Vancouver:
Bignonnet F. Caractérisation expérimentale et modélisation micro-mécanique de la perméabilité et la résistance de roches argileuses : Experimental characterization and multi-scale modeling of the permeability and the strength of mudrocks. [Internet] [Doctoral dissertation]. Université Paris-Est; 2014. [cited 2021 Jan 17].
Available from: http://www.theses.fr/2014PEST1060.
Council of Science Editors:
Bignonnet F. Caractérisation expérimentale et modélisation micro-mécanique de la perméabilité et la résistance de roches argileuses : Experimental characterization and multi-scale modeling of the permeability and the strength of mudrocks. [Doctoral Dissertation]. Université Paris-Est; 2014. Available from: http://www.theses.fr/2014PEST1060
University of Houston
27.
Shi, Cheng.
Evaluation of Steel H-Piles with Localized Corrosion and Rehabilitation Using Friction-Type Bolted Steel Plates.
Degree: PhD, Civil Engineering, 2015, University of Houston
URL: http://hdl.handle.net/10657/5380
► The work presented in this dissertation has two major research objectives related to steel bridge piles with severe but localized corrosion: (1) development of a…
(more)
▼ The work presented in this dissertation has two major research objectives related to steel bridge piles with severe but localized corrosion: (1) development of a
numerical framework to predict the axial capacity of the corroded piles, and (2) development and evaluation of a friction-type bolted steel plate-based rehabilitation system to be used for the repair of corroded piles.
To accomplish the first research objective, an investigation of the remaining compressive capacity of H-piles with simulated corrosion was carried out. This included an experimental program and
numerical simulations. Seven 15-ft-long HP12×53 piles were machined to simulate the section loss due to corrosion and tested under uniaxial compression load. The results obtained from the experimental study of corroded piles were used (1) as a validation for the developed
numerical framework, and (2) as a control group of experimental investigation of the proposed repair system. A finite element model was developed and validated using the experimental results of this study. A parametric study was carried out using the model to investigate the effects of parameters including slenderness of the corroded flange and web, slenderness of the pile, location and extent of the corroded region, and the magnitude of residual stresses. The results indicated that flange thickness reduction is a critical factor influencing the remaining capacity of partially corroded H-piles. The results also demonstrated that increasing pile slenderness and residual stresses reduce the capacity of piles that fail by flexural buckling but have negligible effect on piles that fail by flange/web local buckling.
To achieve the second objective of this study, a friction-type bolted plate-based repair system was proposed. In this proposed method the applied axial load is transferred from the original pile to the steel repair plates through friction at the interface between the pile flanges and the steel repair plates.
The evaluation of the retrofitted piles consisted of both experimental and
numerical programs. Seven piles with the same configurations as the corroded control group were repaired and tested under axial compression. The experimental results demonstrated the effectiveness of the rehabilitation method by ensuring acceptable axial capacity and stiffness. A finite element analysis was conducted to study the factors that influence the efficiency of the repair system, including the length of the steel plates, the magnitude of bolt pretension and slip resistance. The findings indicated that increases of the length of the repair system, magnitude of bolt pretension and slip resistance can enhance the capacity of pile with local failure within the corroded region. These three factors do not have a significant strengthening effect if a pile fails by flexural buckling.
Advisors/Committee Members: Belarbi, Abdeldjelil (advisor), Dawood, Mina (advisor), Herman, Reagan (committee member), Ayoub, Ashraf S. (committee member), Bae, Sang-Wook (committee member).
Subjects/Keywords: Corroded H-piles; Remaining axial capacity; Full-scale experiments; Numerical framework; Friction-type bolted steel plate-based repair system
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APA ·
Chicago ·
MLA ·
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Export
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APA (6th Edition):
Shi, C. (2015). Evaluation of Steel H-Piles with Localized Corrosion and Rehabilitation Using Friction-Type Bolted Steel Plates. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/5380
Chicago Manual of Style (16th Edition):
Shi, Cheng. “Evaluation of Steel H-Piles with Localized Corrosion and Rehabilitation Using Friction-Type Bolted Steel Plates.” 2015. Doctoral Dissertation, University of Houston. Accessed January 17, 2021.
http://hdl.handle.net/10657/5380.
MLA Handbook (7th Edition):
Shi, Cheng. “Evaluation of Steel H-Piles with Localized Corrosion and Rehabilitation Using Friction-Type Bolted Steel Plates.” 2015. Web. 17 Jan 2021.
Vancouver:
Shi C. Evaluation of Steel H-Piles with Localized Corrosion and Rehabilitation Using Friction-Type Bolted Steel Plates. [Internet] [Doctoral dissertation]. University of Houston; 2015. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/10657/5380.
Council of Science Editors:
Shi C. Evaluation of Steel H-Piles with Localized Corrosion and Rehabilitation Using Friction-Type Bolted Steel Plates. [Doctoral Dissertation]. University of Houston; 2015. Available from: http://hdl.handle.net/10657/5380
Univerzitet u Beogradu
28.
Милићевић, Александар, 1987- 30638951.
Математичко моделирање и оптимизација процеса у ложишту
на спрашени угаљ при директном косагоревању са биомасом.
Degree: Mašinski fakultet, 2019, Univerzitet u Beogradu
URL: https://fedorabg.bg.ac.rs/fedora/get/o:20677/bdef:Content/get
► Машинство - Термотехника / Mechanical engineering - Thermal engineering
Using fossil fuels for energy purposes leads to continuous increase in the concentration of CO2, CO,…
(more)
▼ Машинство - Термотехника / Mechanical engineering -
Thermal engineering
Using fossil fuels for energy purposes leads to
continuous increase in the concentration of CO2, CO, SOx, NOx and
other harmful oxides in the atmosphere that cause global warming,
i.e. greenhouse effect, and other negative influences, like acid
rains and photochemical smog. The main motivation for co-firing
coal with biomass is to reduce CO2 emissions as the so-called
greenhouse gas because the greatest impact on global warming, but
also it could contribute to reduction of nitrogen and sulfur
oxides, depending on composition of the fuel. Co-firing coal and
biomass in coal-fired utility boilers for producing the electricity
represents efficient and low-cost option which contributes to the
utilization of biomass as a renewable energy
source...
Advisors/Committee Members: Tucaković, Dragan, 1965- 12706407.
Subjects/Keywords: mathematical modeling; co-firing; pulverized coal;
biomass; furnace; utility boiler; optimization of processes;
turbulent flow; numerical experiments; computer code
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APA (6th Edition):
Милићевић, Александар, 1. 3. (2019). Математичко моделирање и оптимизација процеса у ложишту
на спрашени угаљ при директном косагоревању са биомасом. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:20677/bdef:Content/get
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Милићевић, Александар, 1987- 30638951. “Математичко моделирање и оптимизација процеса у ложишту
на спрашени угаљ при директном косагоревању са биомасом.” 2019. Thesis, Univerzitet u Beogradu. Accessed January 17, 2021.
https://fedorabg.bg.ac.rs/fedora/get/o:20677/bdef:Content/get.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Милићевић, Александар, 1987- 30638951. “Математичко моделирање и оптимизација процеса у ложишту
на спрашени угаљ при директном косагоревању са биомасом.” 2019. Web. 17 Jan 2021.
Vancouver:
Милићевић, Александар 13. Математичко моделирање и оптимизација процеса у ложишту
на спрашени угаљ при директном косагоревању са биомасом. [Internet] [Thesis]. Univerzitet u Beogradu; 2019. [cited 2021 Jan 17].
Available from: https://fedorabg.bg.ac.rs/fedora/get/o:20677/bdef:Content/get.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Милићевић, Александар 13. Математичко моделирање и оптимизација процеса у ложишту
на спрашени угаљ при директном косагоревању са биомасом. [Thesis]. Univerzitet u Beogradu; 2019. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:20677/bdef:Content/get
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Universitat Politècnica de Catalunya
29.
Tamarit Sariol, Anna.
Singular phenomena in the length spectrum of analytic convex curves.
Degree: Departament de Matemàtica Aplicada I, 2015, Universitat Politècnica de Catalunya
URL: http://hdl.handle.net/10803/318372
► Considereu l'aplicació billard definida dins d'una corba tancada, analítica i estrictament convexa Q. Per q>2 i 0<p<q coprimers, existeixen almenys dues trajectòries (p,q)-periòdiques dins de…
(more)
▼ Considereu l'aplicació billard definida dins d'una corba tancada, analítica i estrictament convexa Q. Per q>2 i 0<p<q coprimers, existeixen almenys dues trajectòries (p,q)-periòdiques dins de Q. L'objectiu de la tesi és estudiar la diferència maximal entre longituds de trajectòries (p,q)-periòdiques del billar, D(p,q). La quantitat D(p,q) aporta informació dinàmica i geomètrica. Primer, caracteriza part de l'espectre de longituds de Q i per tant té relació amb la pregunta de Kac, "Can one hear the shape of a drum?''. Segon, D(p,q) es una fita superior de la DW(p/q) de Mather i quantifica el caos de la taula Q. Primer, ens fixem en l'estudi de la diferència maximal de longituds entre òrbites (1,q)-periòdiques. Aquestes òrbites s'apropen a la frontera del billar a mesura que q tendeix a infinit. L'estudi de D(1,q) es realitza des de dues perspectives. D'una banda, obtenim una fita superior exponencialment petita en el periode q per D(1,q). El resultat s'obté en el marc general de la diferència maximal de (p,q)-periòdiques accions entre òrbites (p,q)-periòdiques en aplicacions twist exactes i analítiques. En particular, establim una fita superior exponencialment petita per les diferències entre accions (p,q)-periòdiques quan l'aplicació és analítica en una corba invariant rotacional i (m,n)-resonant i p/q està "prou a prop'' de m/n. L'exponent en la fita superior està estretament lligat a la banda d'analiticitat en una variable angular concreta. El resultat s'obté en dos passos. Primer, provem un teorema tipus Neishtadt. Segon, apliquem el principi d'acció de MacKay-Meiss-Percival. Aquest resultat implica que les longituds de totes les trajectòries (1,q)-periodiques en dominis estrictament convexos i analítics són exponencialment properes en el periode q, fet que millora el resultat clàssic de Marvizi and Melrose sobre el cas regular. Però el resultat també pot aplicar-se en altres contextos de les aplicacions billar i billar dual. Per exemple, mostrem que les àrees de les trajectòries (1,q)-periòdiques del billar dual són exponencialment properes en el període q. Aquest resultat millora un resultat clàssic de Tabachnikov pel cas regular. De l'altra, analitzem formules asimptòtiques exponencialment petites per D(1,q) quan Q is una corba analítica, estrictament convexa i genèricament axisimètrica. En aquest context, conjecturem que les diferències es comporten asimptòticament com un factor q^(-3)*exp(-rq) per una funció constant o bé una funció periòdica. A més, l'exponent r és la meitat del radi de convergència de la transformada de Borel de la coneguda sèrie asimptòtica per les longituds de les trajectòries (1,q)-periòdiques. La conjecture es recolza fortament en els resultats numèrics obtinguts. Els càlculs necessiten aritmètica de precisió múltiple i són fets en PARI/GP. Els
experiments es restringeixen a perturbacions d'el¿lipses i cercles, que permeten comparar els resultat numèrics amb unes prediccions de Melnikov i detectar comportament no genèrics a causa de la presència de més simetries en alguns casos. Les…
Advisors/Committee Members: [email protected] (authoremail), false (authoremailshow), Ramírez Ros, Rafael (director), Martín de la Torre, Pablo (codirector), true (authorsendemail).
Subjects/Keywords: Billiards; Length spectrum; Exponentially small phenomena; Twist maps; Numerical experiments; High-precision computations; Dual billiards; 517
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APA ·
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Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Tamarit Sariol, A. (2015). Singular phenomena in the length spectrum of analytic convex curves. (Thesis). Universitat Politècnica de Catalunya. Retrieved from http://hdl.handle.net/10803/318372
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Tamarit Sariol, Anna. “Singular phenomena in the length spectrum of analytic convex curves.” 2015. Thesis, Universitat Politècnica de Catalunya. Accessed January 17, 2021.
http://hdl.handle.net/10803/318372.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Tamarit Sariol, Anna. “Singular phenomena in the length spectrum of analytic convex curves.” 2015. Web. 17 Jan 2021.
Vancouver:
Tamarit Sariol A. Singular phenomena in the length spectrum of analytic convex curves. [Internet] [Thesis]. Universitat Politècnica de Catalunya; 2015. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/10803/318372.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Tamarit Sariol A. Singular phenomena in the length spectrum of analytic convex curves. [Thesis]. Universitat Politècnica de Catalunya; 2015. Available from: http://hdl.handle.net/10803/318372
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
30.
Δημόπουλος, Χριστόφορος.
Ενίσχυση οπών ανθρωποθυρίδων σε χαλύβδινα κελύφη πυλώνων ανεμογεννητριών: πειραματική και αριθμητική διερεύνηση.
Degree: 2012, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ)
URL: http://hdl.handle.net/10442/hedi/27476
► Objective of this Ph.D. thesis is the study of the efficiency of various stiffening types of the manhole cut-out in steel wind turbine tower shells…
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▼ Objective of this Ph.D. thesis is the study of the efficiency of various stiffening types of the manhole cut-out in steel wind turbine tower shells and the determination of the necessary dimensions of the proposed stiffening types so as to achieve an acceptable strength for the tower. For this purpose, the investigation of the problem is performed first experimentally and then numerically. Τhe experiments led to useful conclusions concerning the effect of the manhole to the strength of the shell as well as the effect of the stiffener considered. Τhe experimental results were used to validate the efficiency of the numerical simulation with the ABAQUS finite element software. Αfter calibration of the numerical models, an excellent agreement between experimental and numerical results was achieved in terms of load-displacement curves and a good qualitative comparison in terms of deformations. With nonlinear numerical analyses (GMNIA) it was found that simple stiffening types such as a simple frame and especially two stringers with a ring stiffener are the more efficient ones. The basic advantages of the second stiffening type are two. First, with this stiffening type less amount of steel is necessary in order to restore the strength of a shell with cut-out to that of the corresponding shell without cut-out. Second, with a small increase of the cross-section area of the stiffeners, failure is transferred outside the cut-out region, and more specifically above the ring.
Σκοπός αυτής της διδακτορικής διατριβής είναι η μελέτη της αποδοτικότητας διαφόρων τύπων ενίσχυσης οπής ανθρωποθυρίδων χαλύβδινων κυλινδρικών πυλώνων ανεμογεννητριών και ο προσδιορισμός απαιτούμενων διαστάσεων των προτεινόμενων μορφών ενίσχυσης ώστε να επιτυγχάνεται αποδεκτή αντοχή του πυλώνα. Η διερεύνηση του προβλήματος έγινε με πειραματικές και αριθμητικές μεθόδους. Τα πειράματα οδήγησαν σε χρήσιμα συμπεράσματα ως προς την επίδραση της οπής στην αντοχή του κελύφους και την επιρροή της χρησιμοποιούμενης ενίσχυσης. Τα πειραματικά αποτελέσματα χρησιμοποιήθηκαν επίσης για τη βαθμονόμηση των
αριθμητικών προσομοιωμάτων πεπερασμένων στοιχείων με το εμπορικό πρόγραμμα ABAQUS από την οποία προέκυψε εξαιρετική σύγκλιση μεταξύ πειραματικών και αριθμητικών αποτελεσμάτων σε ότι αφορά τους δρόμους ισορροπίας και μια πολύ καλή ποιοτική σύγκριση σε όρους παραμορφώσεων. Με μη γραμμικές αναλύσεις (GMNIA) βρέθηκε ότι απλές μορφές ενίσχυσης όπως το απλό πλαίσιο και ειδικότερα τα δυο διαμήκη ελάσματα με δακτύλιο είναι οι πλέον ενδεικνυόμενες. Τα βασικά πλεονεκτήματα της δεύτερης μορφής είναι δύο. Πρώτον, με αυτή τη μορφή απαιτείται μικρότερη ποσότητα χάλυβα για την επαναφορά της αντοχής ενός κελύφους με οπή στην αντίστοιχη αντοχή του πλήρους κελύφους. Δεύτερον, με μικρή επιπλέον επαύξηση του εμβαδού της ενίσχυσης, η αστοχία μεταφέρεται εκτός της περιοχής αυτής και πιο συγκεκριμένα πάνω από τον δακτύλιο.
Subjects/Keywords: Πυλώνας ανεμογεννητριών; Χαλύβδινα κελύφη; Οπή; Ενίσχυση; Πειράματα; Αριθμητική ανάλυση; Wind turbine tower; Steel shells; Opening; Stiffening; Experiments; Numerical analysis
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APA (6th Edition):
Δημόπουλος, . . (2012). Ενίσχυση οπών ανθρωποθυρίδων σε χαλύβδινα κελύφη πυλώνων ανεμογεννητριών: πειραματική και αριθμητική διερεύνηση. (Thesis). National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Retrieved from http://hdl.handle.net/10442/hedi/27476
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Δημόπουλος, Χριστόφορος. “Ενίσχυση οπών ανθρωποθυρίδων σε χαλύβδινα κελύφη πυλώνων ανεμογεννητριών: πειραματική και αριθμητική διερεύνηση.” 2012. Thesis, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Accessed January 17, 2021.
http://hdl.handle.net/10442/hedi/27476.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Δημόπουλος, Χριστόφορος. “Ενίσχυση οπών ανθρωποθυρίδων σε χαλύβδινα κελύφη πυλώνων ανεμογεννητριών: πειραματική και αριθμητική διερεύνηση.” 2012. Web. 17 Jan 2021.
Vancouver:
Δημόπουλος . Ενίσχυση οπών ανθρωποθυρίδων σε χαλύβδινα κελύφη πυλώνων ανεμογεννητριών: πειραματική και αριθμητική διερεύνηση. [Internet] [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2012. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/10442/hedi/27476.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Δημόπουλος . Ενίσχυση οπών ανθρωποθυρίδων σε χαλύβδινα κελύφη πυλώνων ανεμογεννητριών: πειραματική και αριθμητική διερεύνηση. [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2012. Available from: http://hdl.handle.net/10442/hedi/27476
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
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