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Dalhousie University
1.
Butler, Jared P.
Crustal subduction and the exhumation of
(ultra)high-pressure terranes: contrasting modes with examples from
the Alps and Caledonides.
Degree: PhD, Department of Earth Sciences, 2013, Dalhousie University
URL: http://hdl.handle.net/10222/35397 
► The widespread recognition of (ultra)high-pressure ((U)HP) metamorphic rocks in orogens worldwide suggests that subduction and exhumation of crustal rocks from mantle depths are normal processes…
(more)
▼ The widespread recognition of (ultra)high-pressure
((U)HP) metamorphic rocks in orogens worldwide suggests that
subduction and exhumation of crustal rocks from mantle depths are
normal processes at convergent plate margins. However, the dynamics
of these processes, in particular the comparative roles of erosion
and crustal extension, and the driving forces of extension during
(U)HP rock exhumation, remain controversial. This thesis presents
numerical modeling and field/analytical studies that address the
geodynamics of crustal subduction and exhumation in two intensely
studied orogens, the Alps and the Caledonides. The 2D
numerical
models show how different scales and durations of orogeny and plate
motions can lead to marked contrasts in the style of orogenic
growth, crustal subduction, and (U)HP exhumation. In the Western
Alps, rapid exhumation (1-3 cm/a) can be explained by local,
syn-orogenic extension driven by the buoyant ascent of deforming
(U)HP crust from the subduction channel. Later trans-crustal
exhumation probably resulted from the combined effects of
syn-convergent thrusting, local extension, and erosion. The low
temperatures (500-700°C) of Alpine (U)HP metamorphism are
attributable to the small size of the orogen and short duration of
subduction/exhumation. Contrary to recent suggestions, neither
erosion nor absolute extension is required to explain (U)HP
exhumation in the Alps. The Western Gneiss Region (WGR) (Norwegian
Caledonides), in contrast, can be explained by subduction to (U)HP
conditions followed by plate divergence. Gravitational spreading of
a thick, hot orogenic wedge leads to a short period of coeval
thrusting and extension. Exhumation of (U)HP crust from the
subduction channel is achieved by normal-sense shearing along the
top of the (U)HP terrane, with minor associated shortening.
Trans-crustal exhumation by vertical thinning of the orogenic wedge
results from continued absolute extension and erosion. The
comparatively high temperatures (700-800°C) achieved by Caledonian
(U)HP rocks reflect the orogen's greater size, slower exhumation
rates, and possible stalling of the (U)HP terrane at depth. These
contrasting models underscore the variety of possible mechanisms
responsible for (U)HP exhumation, and represent new benchmarks in
the understanding of Alpine and Caledonian tectonics and (U)HP rock
exhumation in general.
Advisors/Committee Members: Romain Bousquet (external-examiner), Nicholas Culshaw (graduate-coordinator), Djordje Grujic (thesis-reader), Nicholas Culshaw (thesis-reader), Christopher Beaumont and Rebecca A. Jamieson (thesis-supervisor), Not Applicable (ethics-approval), Yes (manuscripts), Yes (copyright-release).
Subjects/Keywords: metamorphism; tectonics; geodynamics; numerical modeling
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APA (6th Edition):
Butler, J. P. (2013). Crustal subduction and the exhumation of
(ultra)high-pressure terranes: contrasting modes with examples from
the Alps and Caledonides. (Doctoral Dissertation). Dalhousie University. Retrieved from http://hdl.handle.net/10222/35397
Chicago Manual of Style (16th Edition):
Butler, Jared P. “Crustal subduction and the exhumation of
(ultra)high-pressure terranes: contrasting modes with examples from
the Alps and Caledonides.” 2013. Doctoral Dissertation, Dalhousie University. Accessed January 22, 2021.
http://hdl.handle.net/10222/35397.
MLA Handbook (7th Edition):
Butler, Jared P. “Crustal subduction and the exhumation of
(ultra)high-pressure terranes: contrasting modes with examples from
the Alps and Caledonides.” 2013. Web. 22 Jan 2021.
Vancouver:
Butler JP. Crustal subduction and the exhumation of
(ultra)high-pressure terranes: contrasting modes with examples from
the Alps and Caledonides. [Internet] [Doctoral dissertation]. Dalhousie University; 2013. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10222/35397.
Council of Science Editors:
Butler JP. Crustal subduction and the exhumation of
(ultra)high-pressure terranes: contrasting modes with examples from
the Alps and Caledonides. [Doctoral Dissertation]. Dalhousie University; 2013. Available from: http://hdl.handle.net/10222/35397
Texas A&M University
2.
Luo, Jun.
Engineering, Financial and Net Energy Performance, and Risk Analysis for Parabolic Trough Solar Power Plants.
Degree: PhD, Mechanical Engineering, 2014, Texas A&M University
URL: http://hdl.handle.net/1969.1/153467
► An investigation was conducted to determine how technology innovations, potential risks, plant configuration and size, operating strategy, and financial incentives affect the electricity output, financial…
(more)
▼ An investigation was conducted to determine how technology innovations, potential risks, plant configuration and size, operating strategy, and financial incentives affect the electricity output, financial payback, and net energy performance of a concentrating solar power plant.
A set of engineering performance, financial and net energy models were developed as tools to predict a plant’s engineering performance, cost and energy payback. The models were validated by comparing the predicted results to operational data from an actual solar power plant. The models were used to analyze the effect of several combinations of design and operating parameters on the amount and cost of electrical output. In addition, they were used to assess the risk of particular component failures and their effect on plant engineering and financial performance, and to conduct an analysis to predict energy payback.
The results show some fundamental conclusions. First, the electricity production could be improved by adjusting plant configuration, increase the storage system size and increase the scale of plant. Second, the cost of electricity generated from a CSP plant will be higher (as much as 400%) than that of fossil fuel based power plants. Several methods could be used to lower the cost, such as constructing large plants, adopting new material and innovation components. However, the cost reduction will not be enough. Survival and future development of CSP plants may rely on external support, which might include incentives or supportive policies. Third, generally a CSP plant will have a positive net energy with an energy payback of approximately 5 years. Last, flex hoses are the most vulnerable components in the solar field. Performming regular maintenance work should be necessary to maintain the solar field’s performance level.
Advisors/Committee Members: Lalk, Thomas (advisor), Schuller, Michael (advisor), Pate, Michael (committee member), Wen, Sy-Bor (committee member).
Subjects/Keywords: Concentrating solar power; numerical modeling
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APA (6th Edition):
Luo, J. (2014). Engineering, Financial and Net Energy Performance, and Risk Analysis for Parabolic Trough Solar Power Plants. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/153467
Chicago Manual of Style (16th Edition):
Luo, Jun. “Engineering, Financial and Net Energy Performance, and Risk Analysis for Parabolic Trough Solar Power Plants.” 2014. Doctoral Dissertation, Texas A&M University. Accessed January 22, 2021.
http://hdl.handle.net/1969.1/153467.
MLA Handbook (7th Edition):
Luo, Jun. “Engineering, Financial and Net Energy Performance, and Risk Analysis for Parabolic Trough Solar Power Plants.” 2014. Web. 22 Jan 2021.
Vancouver:
Luo J. Engineering, Financial and Net Energy Performance, and Risk Analysis for Parabolic Trough Solar Power Plants. [Internet] [Doctoral dissertation]. Texas A&M University; 2014. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/1969.1/153467.
Council of Science Editors:
Luo J. Engineering, Financial and Net Energy Performance, and Risk Analysis for Parabolic Trough Solar Power Plants. [Doctoral Dissertation]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/153467
Texas A&M University
3.
Tankala, Chandan.
Numerical Analysis on the Generation of Equilibrium Aeolian Sedimentary Bed-Forms From Random Surfaces.
Degree: MS, Geophysics, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11532
► The formation of aeolian ripples has been modeled, quite successfully, using discrete approaches like cellular automaton models. Numerical analysis of continuum models to obtain similar…
(more)
▼ The formation of aeolian ripples has been modeled, quite successfully, using discrete approaches like cellular automaton models.
Numerical analysis of continuum models to obtain similar success in
modeling ripple evolution, however, has not been studied extensively. A
numerical model based on continuum theories expedites calculations, as opposed to discrete approaches which model trajectory of each and every sand grain, and are hence relatively more economical. The
numerical analysis strives to contribute to the field of study of aeolian ripple migration by an extensive comparison and discussion of modeled ripple evolution results with those of a particular laboratory based wind-tunnel experiment. This research also endeavors to under- stand the physics behind ripple generation and what parameters to be modified to account for multiple grain sizes. Incorporation of multiple grain sizes would enable us to study the stratigraphy of the generated bed-forms. To obtain smoother and realistic ripple surfaces, a sixth-order compact finite difference
numerical scheme is used for spatial derivates and fourth-order Runge-Kutta scheme for time derivates. The boundary conditions incorporated are periodic and the initial condition employed to generate ripple is a rough sand surface. The
numerical model is applied to study the effect of varying the angle, at which the sand bed gets impacted by sand grains, on the evolution of ripples. Ripples are analyzed qualitatively and quantitatively by considering the contribution of processes involved in the evolution process. The ripple profiles and the time taken to reach equilibrium state, obtained by
numerical experiments, are in close agreement with the ones obtained by the wind-tunnel experiment.
Advisors/Committee Members: Tice, Micheal (advisor), Weiss, Robert (advisor), Kaihatu, James (committee member).
Subjects/Keywords: Aeolian Sediment Transport; Numerical Modeling
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APA (6th Edition):
Tankala, C. (2012). Numerical Analysis on the Generation of Equilibrium Aeolian Sedimentary Bed-Forms From Random Surfaces. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11532
Chicago Manual of Style (16th Edition):
Tankala, Chandan. “Numerical Analysis on the Generation of Equilibrium Aeolian Sedimentary Bed-Forms From Random Surfaces.” 2012. Masters Thesis, Texas A&M University. Accessed January 22, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11532.
MLA Handbook (7th Edition):
Tankala, Chandan. “Numerical Analysis on the Generation of Equilibrium Aeolian Sedimentary Bed-Forms From Random Surfaces.” 2012. Web. 22 Jan 2021.
Vancouver:
Tankala C. Numerical Analysis on the Generation of Equilibrium Aeolian Sedimentary Bed-Forms From Random Surfaces. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11532.
Council of Science Editors:
Tankala C. Numerical Analysis on the Generation of Equilibrium Aeolian Sedimentary Bed-Forms From Random Surfaces. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11532
4.
Roumiguier, Lena.
Frittage par Spark Plasma Sintering de céramiques de carbure de bore : modélisation numérique du procédé et optimisation des nano-,microstructures pour l’amélioration des performances des absorbants en réacteurs à neutrons rapides : Spark Plasma Sintering of boron carbide ceramics : numerical modeling of process and optimization of nano,micro-structures to enhance absorber materials behavior in fast neutron reactors.
Degree: Docteur es, Matériaux céramiques et traitements de surface, 2019, Limoges
URL: http://www.theses.fr/2019LIMO0109
► Cette étude a pour objectif d’élaborer de nouveaux matériaux de carbure de bore utilisés en tant qu’absorbants neutroniques en réacteurs à neutrons rapides. La stratégie…
(more)
▼ Cette étude a pour objectif d’élaborer de nouveaux matériaux de carbure de bore utilisés en tant qu’absorbants neutroniques en réacteurs à neutrons rapides. La stratégie adoptée vise l’affinement de la microstructure des matériaux afin de limiter le phénomène de déformation anisotropique des grains sous irradiation qui est responsable de la dégradation des pastilles en fonctionnement. Deux nuances de matériaux ont été élaborées par le procédé SPS avec des microstructures submicroniques et nanométriques, permettant une diminution des tailles de grains par rapport au matériau de référence historiquement utilisé par le CEA. Les matériaux SPS ainsi que le matériau de référence ont été caractérisés et comparés du point de vue chimique, mécanique et thermique. Ce second volet de l’étude a permis de sélectionner le matériau SPS submicronique et d’approfondir les caractérisations en matière de résistance à la rupture et de tenue aux chocs thermiques. Il a ainsi été montré un gain de performance par rapport au matériau de référence. D’autre part, le comportement au fluage à haute température du matériau SPS a été évalué et les mécanismes de déformation associés identifiés. Par ailleurs, la fabrication des pastilles d’absorbant nécessitant un accroissement du rapport hauteur sur diamètre par rapport aux pastilles SPS classiques, un modèle numérique a été développé. L’acquisition des différentes données du procédé nécessaire à cette modélisation a reposé sur une instrumentation spécifique aux mesures thermiques et électriques. D’autre part, les paramètres de densification du matériau SPS ont été déterminés à partir d’un modèle d’écoulement visqueux non linéaire. Les phénomènes thermiques, électriques et mécaniques décrits par le modèle ont alors été validés par la confrontation au suivi expérimental du retrait d’un échantillon de carbure de bore.
This study aims at developing new boron carbide materials, used as neutron absorbers for fast neutron reactors. The defined strategy is to refine the microstructure to limit the anisotropic swelling of grains under irradiation, responsible for the premature deterioration of pellets. To this end, submicronic and nanometric powders were densified by Spark Plasma Sintering. Two materials were elaborated by Spark Plasma Sintering with submicronic or nanometric microstructures, allowing a reduction in grain sizes compared to the reference material historically used in fast reactors by the CEA. SPS and reference materials were characterized and compared in terms of chemical composition, mechanical and thermal properties. This study led to the selection of the submicronic material and to further investigation regarding flexural strength and thermal shock resistance. The performance was improved compared to the reference. Moreover, the creep behavior at high temperature was characterized and creep parameters were identified. Furthermore, the production of absorbent pellets require to increase the height/diameter ratio compared to classical SPS pellets. Process data necessary for this…
Advisors/Committee Members: Maître, Alexandre (thesis director), Antou, Guy (thesis director).
Subjects/Keywords: Modélisation numérique; Numerical modeling; 620.11
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APA (6th Edition):
Roumiguier, L. (2019). Frittage par Spark Plasma Sintering de céramiques de carbure de bore : modélisation numérique du procédé et optimisation des nano-,microstructures pour l’amélioration des performances des absorbants en réacteurs à neutrons rapides : Spark Plasma Sintering of boron carbide ceramics : numerical modeling of process and optimization of nano,micro-structures to enhance absorber materials behavior in fast neutron reactors. (Doctoral Dissertation). Limoges. Retrieved from http://www.theses.fr/2019LIMO0109
Chicago Manual of Style (16th Edition):
Roumiguier, Lena. “Frittage par Spark Plasma Sintering de céramiques de carbure de bore : modélisation numérique du procédé et optimisation des nano-,microstructures pour l’amélioration des performances des absorbants en réacteurs à neutrons rapides : Spark Plasma Sintering of boron carbide ceramics : numerical modeling of process and optimization of nano,micro-structures to enhance absorber materials behavior in fast neutron reactors.” 2019. Doctoral Dissertation, Limoges. Accessed January 22, 2021.
http://www.theses.fr/2019LIMO0109.
MLA Handbook (7th Edition):
Roumiguier, Lena. “Frittage par Spark Plasma Sintering de céramiques de carbure de bore : modélisation numérique du procédé et optimisation des nano-,microstructures pour l’amélioration des performances des absorbants en réacteurs à neutrons rapides : Spark Plasma Sintering of boron carbide ceramics : numerical modeling of process and optimization of nano,micro-structures to enhance absorber materials behavior in fast neutron reactors.” 2019. Web. 22 Jan 2021.
Vancouver:
Roumiguier L. Frittage par Spark Plasma Sintering de céramiques de carbure de bore : modélisation numérique du procédé et optimisation des nano-,microstructures pour l’amélioration des performances des absorbants en réacteurs à neutrons rapides : Spark Plasma Sintering of boron carbide ceramics : numerical modeling of process and optimization of nano,micro-structures to enhance absorber materials behavior in fast neutron reactors. [Internet] [Doctoral dissertation]. Limoges; 2019. [cited 2021 Jan 22].
Available from: http://www.theses.fr/2019LIMO0109.
Council of Science Editors:
Roumiguier L. Frittage par Spark Plasma Sintering de céramiques de carbure de bore : modélisation numérique du procédé et optimisation des nano-,microstructures pour l’amélioration des performances des absorbants en réacteurs à neutrons rapides : Spark Plasma Sintering of boron carbide ceramics : numerical modeling of process and optimization of nano,micro-structures to enhance absorber materials behavior in fast neutron reactors. [Doctoral Dissertation]. Limoges; 2019. Available from: http://www.theses.fr/2019LIMO0109
Delft University of Technology
5.
Wang, Yao (author).
The Impact of micro-tunnelling on adjacent pile foundations: Numerical modelling of micro-tunnel excavation in PLAXIS.
Degree: 2019, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:ad549ce5-4ce0-498b-a034-455fb3be572e
► A series of finite element simulations via PLAXIS were carried out to investigate the effects of micro- tunnelling on nearby pile foundations. A numerical model…
(more)
▼ A series of finite element simulations via PLAXIS were carried out to investigate the effects of micro- tunnelling on nearby pile foundations. A numerical model concerning the large diameter tunnel boring machine was first established based on identical properties of the centrifuge experiment executed by Loganathan et al. (2000). Results from numerical simulation were validated by measured data from the centrifuge test. After the validation of the numerical modelling method, the model was adjusted to match the case of micro-tunnel and a new model regarding the micro-tunnelling procedure was generated based on geotechnical conditions of the North/South Metro Line Amsterdam. The Hardening Soil constitutive model was chosen for all soil layers. In the model, the condition of single bored pile with working load was activated in the greenfield condition before the simulation of micro- tunnel. Advancement procedure of the micro-tunnel was simulated, and pile responses were collected under the plane strain condition. Based on the study of the model, two load transfer mechanisms of piles during tunnel-pile interaction process were identified. Impact of tunnel advancement on adjacent piles was also interpreted. A set of parametric studies were implemented to study changes of pile settlement and bearing capacity with increasing volume loss. An influence zone around the micro- tunnel respecting the potential of pile critical movements was established. Although the lack of field data makes the validation of results hard, comparison with analytical prediction and measured data from the centrifuge test shows good agreements for soil movements and pile responses. The results of this research remain to be validated by field data but it can provide insights into the problem of the impact of micro-tunnelling on piles.
Geo-Engineering
Advisors/Committee Members: Broere, Wout (mentor), Reinders, Kristina (mentor), de Nijs, Richard (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: Numerical modeling; Micro-tunnel; Plaxis
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APA (6th Edition):
Wang, Y. (. (2019). The Impact of micro-tunnelling on adjacent pile foundations: Numerical modelling of micro-tunnel excavation in PLAXIS. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:ad549ce5-4ce0-498b-a034-455fb3be572e
Chicago Manual of Style (16th Edition):
Wang, Yao (author). “The Impact of micro-tunnelling on adjacent pile foundations: Numerical modelling of micro-tunnel excavation in PLAXIS.” 2019. Masters Thesis, Delft University of Technology. Accessed January 22, 2021.
http://resolver.tudelft.nl/uuid:ad549ce5-4ce0-498b-a034-455fb3be572e.
MLA Handbook (7th Edition):
Wang, Yao (author). “The Impact of micro-tunnelling on adjacent pile foundations: Numerical modelling of micro-tunnel excavation in PLAXIS.” 2019. Web. 22 Jan 2021.
Vancouver:
Wang Y(. The Impact of micro-tunnelling on adjacent pile foundations: Numerical modelling of micro-tunnel excavation in PLAXIS. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Jan 22].
Available from: http://resolver.tudelft.nl/uuid:ad549ce5-4ce0-498b-a034-455fb3be572e.
Council of Science Editors:
Wang Y(. The Impact of micro-tunnelling on adjacent pile foundations: Numerical modelling of micro-tunnel excavation in PLAXIS. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:ad549ce5-4ce0-498b-a034-455fb3be572e
Delft University of Technology
6.
Mou, Y. (author).
Study on the impacts of floating seaweed on wind waves.
Degree: 2015, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:d48b0cc0-dc60-4e73-a8f0-6b5cedc81896
► As human beings are becoming more and more aware of importance of the environment, resorts to clean energy have provoked great interest for the past…
(more)
▼ As human beings are becoming more and more aware of importance of the environment, resorts to clean energy have provoked great interest for the past decades. As a sort of clean power, wind has been widely considered as an ideal energy source to generate electricity. That is why the offshore wind farm plans have been drawn up, specifically in North Sea in Europe. Besides, in order to comply with marine spatial planning which aims to make use of marine resources sustainably, seaweed aquaculture will also be operated among wind farm zone under wind turbines, which provides the food necessity for mankind. The introduction of seaweed aquaculture may have influences on local hydrodynamics as seaweed attenuates waves, which may further affect the environment. This effect has not been understood. Therefore this study is conducted to investigate the impact of seaweed aquaculture on wind waves. As a relatively young sector, few studies have been found on the effect of floating vegetation on waves. Since there is no ready-to-use hydrodynamic model which can deal with floating seaweed, it is required to set up a
numerical model and calibrate this model with experimental data. In this research the wave modelling program SWAN is used owing to the fact that there exists a vegetation model in SWAN. In this model the vegetation is schematised as stiff cylinders mounted at the bottom. The energy dissipation by vegetation is calculated as work carried out by the drag force induced by cylinders. However, the function of this vegetation model in SWAN is somewhat different from what is required for this study. Firstly, the SWAN deals with bottom-mounted vegetation while in this research floating vegetation is addressed. Secondly, in SWAN model stiff objects are considered while in current research the vegetation possesses flexibility. With flexibility the drag force will become smaller as the relative velocity between water particle and vegetation gets smaller. On the other hand, the inertial force may have an impact on the wave energy dissipation. Considering these two differences, corresponding measures need to be taken to meet the requirement of this study. To model the floating vegetation, the original vegetation model has been modified. In the beginning, the floating vegetation model is achieved by dividing the vegetation into two vertical layers and making the lower layer virtual. There is drawback in this model: only flatbed can be applied. For sensitivity analysis and calibration this model works well, but it is not applicable in the case study as non-flat seabed is implemented in the model setup. It leads to a second modification in the SWAN model. The method is to alter the interval of integration of dissipation term by vegetation, which results in further change in the source code. To account for the flexibility, the bulk drag coefficient is adjusted. This parameter accommodates the influence of flexibility of vegetation and uncertainty of other parameters related to the model. To test this floating vegetation model a…
Advisors/Committee Members: Reniers, A.J.H.M. (mentor), Schouten, J.J. (mentor), Zijlema, M. (mentor), Vuik, V. (mentor), Cao, H.J. (mentor).
Subjects/Keywords: floating seaweed; wave; numerical modeling
Record Details
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APA ·
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APA (6th Edition):
Mou, Y. (. (2015). Study on the impacts of floating seaweed on wind waves. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:d48b0cc0-dc60-4e73-a8f0-6b5cedc81896
Chicago Manual of Style (16th Edition):
Mou, Y (author). “Study on the impacts of floating seaweed on wind waves.” 2015. Masters Thesis, Delft University of Technology. Accessed January 22, 2021.
http://resolver.tudelft.nl/uuid:d48b0cc0-dc60-4e73-a8f0-6b5cedc81896.
MLA Handbook (7th Edition):
Mou, Y (author). “Study on the impacts of floating seaweed on wind waves.” 2015. Web. 22 Jan 2021.
Vancouver:
Mou Y(. Study on the impacts of floating seaweed on wind waves. [Internet] [Masters thesis]. Delft University of Technology; 2015. [cited 2021 Jan 22].
Available from: http://resolver.tudelft.nl/uuid:d48b0cc0-dc60-4e73-a8f0-6b5cedc81896.
Council of Science Editors:
Mou Y(. Study on the impacts of floating seaweed on wind waves. [Masters Thesis]. Delft University of Technology; 2015. Available from: http://resolver.tudelft.nl/uuid:d48b0cc0-dc60-4e73-a8f0-6b5cedc81896
Louisiana State University
7.
Basyal, Gyan Prasad.
Comparison of Land Building by Mississippi River Diversion Using One and Two Dimensional Numerical Models.
Degree: MSCE, Civil and Environmental Engineering, 2014, Louisiana State University
URL: etd-07142014-131712
;
https://digitalcommons.lsu.edu/gradschool_theses/2385
► River sediment diversions have been identified as one strategy for creating new land and offsetting Mississippi River delta plain land loss. Numerical modeling is one…
(more)
▼ River sediment diversions have been identified as one strategy for creating new land and offsetting Mississippi River delta plain land loss. Numerical modeling is one tool for estimating the amount of land, geomorphic features and ecological benefits from diversions. There are a number of models proposed to estimate sediment diversion land building, ranging from simplistic approaches that provide bulk characteristics and use little computational resources to process-based models that require a large amount of input parameters and computing power. This thesis aims to compare and contrast two approaches to simulating the land building processes in a simplified receiving basin: a 1D spatially averaged model; and a horizontal 2D, process-based Delft3D model. Four scenarios were run: three with varying amounts of non-cohesive sediment; and one with a mixture of non-cohesive and cohesive sediment. A number of simplifying assumptions were made for more direct comparisons of the bulk and detailed delta properties and the computational resources. These included the bulking of cohesive and non-cohesive sediments on deposition are assumed equal; erosion below the pre-delta strata is not allowed; and the river sediment diversion operates continuously at a given flow and sediment concentration. Note that this last assumption was made for easier model comparisons and not how any proposed diversions would be operated. Distributary channel network information, missing in the 1D model but important for ecohydrological processes, is extracted from the 2D model. The 1D model took less than one minute to simulate the same scenario that required over 20 hours on 32 processors using the 2D model. Results showed the 1D model delta radii and areas were always larger, but relatively close, to those simulated by the 2D model, particularly for non-cohesive sediments. The deltas formed from solely non-cohesive sediments had numerous short, but wide, channels and were roughly fan shaped, thus justifying the radial symmetry assumption of the 1D model. The ratios of the 2D to 1D model delta areas were 70% and 55% for non-cohesive and mixed scenarios, respectively. The 2D model results showed that presence of cohesive sediment promoted narrower and weakly sinuous channels that affect delta growth dynamics and result in increased vertical aggradation, thus limiting the area of land built.
Subjects/Keywords: numerical modeling; delta models
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APA (6th Edition):
Basyal, G. P. (2014). Comparison of Land Building by Mississippi River Diversion Using One and Two Dimensional Numerical Models. (Masters Thesis). Louisiana State University. Retrieved from etd-07142014-131712 ; https://digitalcommons.lsu.edu/gradschool_theses/2385
Chicago Manual of Style (16th Edition):
Basyal, Gyan Prasad. “Comparison of Land Building by Mississippi River Diversion Using One and Two Dimensional Numerical Models.” 2014. Masters Thesis, Louisiana State University. Accessed January 22, 2021.
etd-07142014-131712 ; https://digitalcommons.lsu.edu/gradschool_theses/2385.
MLA Handbook (7th Edition):
Basyal, Gyan Prasad. “Comparison of Land Building by Mississippi River Diversion Using One and Two Dimensional Numerical Models.” 2014. Web. 22 Jan 2021.
Vancouver:
Basyal GP. Comparison of Land Building by Mississippi River Diversion Using One and Two Dimensional Numerical Models. [Internet] [Masters thesis]. Louisiana State University; 2014. [cited 2021 Jan 22].
Available from: etd-07142014-131712 ; https://digitalcommons.lsu.edu/gradschool_theses/2385.
Council of Science Editors:
Basyal GP. Comparison of Land Building by Mississippi River Diversion Using One and Two Dimensional Numerical Models. [Masters Thesis]. Louisiana State University; 2014. Available from: etd-07142014-131712 ; https://digitalcommons.lsu.edu/gradschool_theses/2385
Colorado School of Mines
8.
Tijerina, Danielle T.
Improving U.S. national water modeling: an intercomparison of two high-resolution, continental scale models, ParFlow-CONUS and the National Water Model v1.2 configuration of WRF-Hydro.
Degree: MS(M.S.), Geology and Geological Engineering, 2018, Colorado School of Mines
URL: http://hdl.handle.net/11124/172400
► Development of integrated hydrology modeling systems, where subsurface, land-surface, and energy budget processes are represented, is an increasing trend. In hydrologic science, there is a…
(more)
▼ Development of integrated hydrology
modeling systems, where subsurface, land-surface, and energy budget processes are represented, is an increasing trend. In hydrologic science, there is a need for more intricate models for comprehensive hydrologic forecasting and water management over large spatial areas, specifically the Continental US (CONUS). We compare streamflow output from two models developed for the CONUS: ParFlow-CONUS, using the integrated model ParFlow and WRF-Hydro.NWM, a configuration of the National Water Model version 1.2 using the National Center for Atmospheric Research, Weather Research and Forecasting hydro extension package WRF-Hydro. Accurately representing large domains remains a challenge considering the difficult task of representing complex hydrologic processes, computational expense, and extensive data needs. Intercomparing models helps disentangle process, parameter, and formulation differences. Results show that WRF-Hydro.NWM and PF-CONUS generally capture flow magnitude, but WRF-Hydro.NWM better captures flow timing. Spatial differences exist as well—both models accurately simulate the humid east, but struggle with the Great Plains and intermountain west. Simulations such as these will help improve physical process representation in hydrologic models and give greater confidence in large-scale forecasts.
Advisors/Committee Members: Maxwell, Reed M. (advisor), Condon, Laura E. (committee member), Gochis, David (committee member), Zhou, Wendy (committee member).
Subjects/Keywords: hydrology; continental; numerical modeling
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APA (6th Edition):
Tijerina, D. T. (2018). Improving U.S. national water modeling: an intercomparison of two high-resolution, continental scale models, ParFlow-CONUS and the National Water Model v1.2 configuration of WRF-Hydro. (Masters Thesis). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/172400
Chicago Manual of Style (16th Edition):
Tijerina, Danielle T. “Improving U.S. national water modeling: an intercomparison of two high-resolution, continental scale models, ParFlow-CONUS and the National Water Model v1.2 configuration of WRF-Hydro.” 2018. Masters Thesis, Colorado School of Mines. Accessed January 22, 2021.
http://hdl.handle.net/11124/172400.
MLA Handbook (7th Edition):
Tijerina, Danielle T. “Improving U.S. national water modeling: an intercomparison of two high-resolution, continental scale models, ParFlow-CONUS and the National Water Model v1.2 configuration of WRF-Hydro.” 2018. Web. 22 Jan 2021.
Vancouver:
Tijerina DT. Improving U.S. national water modeling: an intercomparison of two high-resolution, continental scale models, ParFlow-CONUS and the National Water Model v1.2 configuration of WRF-Hydro. [Internet] [Masters thesis]. Colorado School of Mines; 2018. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/11124/172400.
Council of Science Editors:
Tijerina DT. Improving U.S. national water modeling: an intercomparison of two high-resolution, continental scale models, ParFlow-CONUS and the National Water Model v1.2 configuration of WRF-Hydro. [Masters Thesis]. Colorado School of Mines; 2018. Available from: http://hdl.handle.net/11124/172400
Delft University of Technology
9.
Nata, Spyridoula (author).
Integrated Modeling of Offshore Wind Turbines.
Degree: 2018, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:3efd95ae-5c9b-42ab-b311-ce003d05109d
► In order for the offshore wind industry to be competitive, the cost has to be driven down. One of the major factors that contribute to…
(more)
▼ In order for the offshore wind industry to be competitive, the cost has to be driven down. One of the major factors that contribute to the overall cost is the over-dimensioning of the substructure. The response of the structure under various loading conditions can provide valuable insight in the design phase so as to provide a structural design that is cost effective yet reliable, and can withstand the loads that are considered to act on the structure. The objective of the present thesis is the development of a 1D finite element model, that allows for a dynamic analysis of an offshore wind turbine under the combined actions of wind and wave or wind and ice. For this purpose, different models have been combined and improved or extended. Through this model the importance of accounting for non-linear and breaking waves, the effect of the kinematic stretching on the response and the manner in which the misalignment of the load affects the response can be investigated. A detailed design of the NREL-5MW offshore wind turbine supported by a monopile is subjected to wind, wave and ice action. The aerodynamic action is evaluated through a model valid for the above rated regime when pitch control is active, using a turbulent wind signal resulting from the Kaimal spectrum. The hydrodynamic action is calculated either with the Morison equation or the MacCamy and Fuchs equation with the use of either linear or nonlinear water particle kinematics. An approach towards the calculation of the load from a breaking wave is considered accounting for the wave skewness and asymmetry during such an event. The ice action is calculated through a model that evaluates the force while in the crushing regime. The soil is represented with linear soil springs. The structure’s response is investigated for all the loads separately at first. The next step is the combined analysis. Aligned and misaligned cases are considered. Results show that wind load is dominating the response in the aligned and misaligned wind and wave case regardless of the method used to calculate the hydrodynamic load in the case of a small wave height. In the case of a larger wave height, using Stokes theory and the Morison equation, the hydrodynamic load is contributing to the resulting response. Concerning the ice loading, the intermittent crushing and the continuous brittle crushing regimes occur for the turbine. The response to the combined wind and ice action appears to be affected by both loads in all examined cases.
Offshore and Dredging Engineering
Advisors/Committee Members: Metrikine, Andrei (graduation committee), van der Male, Pim (mentor), Hendrikse, Hayo (graduation committee), van Dalen, Karel (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: Offshore wind turbines; numerical modeling; integrated modeling
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APA (6th Edition):
Nata, S. (. (2018). Integrated Modeling of Offshore Wind Turbines. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:3efd95ae-5c9b-42ab-b311-ce003d05109d
Chicago Manual of Style (16th Edition):
Nata, Spyridoula (author). “Integrated Modeling of Offshore Wind Turbines.” 2018. Masters Thesis, Delft University of Technology. Accessed January 22, 2021.
http://resolver.tudelft.nl/uuid:3efd95ae-5c9b-42ab-b311-ce003d05109d.
MLA Handbook (7th Edition):
Nata, Spyridoula (author). “Integrated Modeling of Offshore Wind Turbines.” 2018. Web. 22 Jan 2021.
Vancouver:
Nata S(. Integrated Modeling of Offshore Wind Turbines. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Jan 22].
Available from: http://resolver.tudelft.nl/uuid:3efd95ae-5c9b-42ab-b311-ce003d05109d.
Council of Science Editors:
Nata S(. Integrated Modeling of Offshore Wind Turbines. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:3efd95ae-5c9b-42ab-b311-ce003d05109d
10.
Noetscher, Gregory Michael.
The VHP-F Computational Phantom and its Applications for Electromagnetic Simulations.
Degree: PhD, 2014, Worcester Polytechnic Institute
URL: etd-043014-110503
;
https://digitalcommons.wpi.edu/etd-dissertations/237
► Modeling of the electromagnetic, structural, thermal, or acoustic response of the human body to various external and internal stimuli is limited by the availability of…
(more)
▼ Modeling of the electromagnetic, structural, thermal, or acoustic response of the human body to various external and internal stimuli is limited by the availability of anatomically accurate and numerically efficient computational models. The models currently approved for use are generally of proprietary or fixed format, preventing new model construction or customization. 1. This dissertation develops a new Visible Human Project - Female (VHP-F) computational phantom, constructed via segmentation of anatomical cryosection images taken in the axial plane of the human body. Its unique property is superior resolution on human head. In its current form, the VHP-F model contains 33 separate objects describing a variety of human tissues within the head and torso. Each obejct is a non-intersecting 2-manifold model composed of contiguous surface triangular elements making the VHP-F model compatible with major commercial and academic
numerical simulators employing the Finite Element Method (FEM), Boundary Element Method (BEM), Finite Volume Method (FVM), and Finite-Difference Time-Domain (FDTD) Method. 2. This dissertation develops a new workflow used to construct the VHP-F model that may be utilized to build accessible custom models from any medical image data source. The workflow is customizable and flexible, enabling the creation of standard and parametrically varying models facilitating research on impacts associated with fluctuation of body characteristics (for example, skin thickness) and dynamic processes such as fluid pulsation. 3. This dissertation identifies, enables, and quantifies three new specific computational bioelectromagnetic problems, each of which is solved with the help of the developed VHP-F model: I. Transcranial Direct Current Stimulation (tDCS) of human brain motor cortex with extracephalic versus cephalic electrodes; II. RF channel characterization within cerebral cortex with novel small on-body directional antennas; III. Body Area Network (BAN) characterization and RF localization within the human body using the FDTD method and small antenna models with coincident phase centers. Each of those problems has been (or will be) the
subject of a separate dedicated MS thesis.
Advisors/Committee Members: Sergey N. Makarov, Advisor, Ara Nazarian, Committee Member, Vishwanath Iyer, Committee Member, Andrew Cavanaugh, Committee Member, Mikhail Kozlov, Committee Member.
Subjects/Keywords: Computational electromagnetics; Numerical modeling; Human body modeling
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APA (6th Edition):
Noetscher, G. M. (2014). The VHP-F Computational Phantom and its Applications for Electromagnetic Simulations. (Doctoral Dissertation). Worcester Polytechnic Institute. Retrieved from etd-043014-110503 ; https://digitalcommons.wpi.edu/etd-dissertations/237
Chicago Manual of Style (16th Edition):
Noetscher, Gregory Michael. “The VHP-F Computational Phantom and its Applications for Electromagnetic Simulations.” 2014. Doctoral Dissertation, Worcester Polytechnic Institute. Accessed January 22, 2021.
etd-043014-110503 ; https://digitalcommons.wpi.edu/etd-dissertations/237.
MLA Handbook (7th Edition):
Noetscher, Gregory Michael. “The VHP-F Computational Phantom and its Applications for Electromagnetic Simulations.” 2014. Web. 22 Jan 2021.
Vancouver:
Noetscher GM. The VHP-F Computational Phantom and its Applications for Electromagnetic Simulations. [Internet] [Doctoral dissertation]. Worcester Polytechnic Institute; 2014. [cited 2021 Jan 22].
Available from: etd-043014-110503 ; https://digitalcommons.wpi.edu/etd-dissertations/237.
Council of Science Editors:
Noetscher GM. The VHP-F Computational Phantom and its Applications for Electromagnetic Simulations. [Doctoral Dissertation]. Worcester Polytechnic Institute; 2014. Available from: etd-043014-110503 ; https://digitalcommons.wpi.edu/etd-dissertations/237
Dalhousie University
11.
Cui, Yan.
NUMERICAL AND EXPERIMENTAL STUDY OF GROUTED ROCK BOLTS AND
THEIR DEFECTS USING ULTRASONIC GUIDED WAVES.
Degree: PhD, Department of Civil Engineering, 2013, Dalhousie University
URL: http://hdl.handle.net/10222/22018
► A rock bolt installed in field has only one short exposed end on the rock surface. This condition has posed challenges in field instrumentation and…
(more)
▼ A rock bolt installed in field has only one short
exposed end on the rock surface. This condition has posed
challenges in field instrumentation and made it difficult to use
the ultrasonic guided wave method for rock bolt monitoring. In rock
bolt laboratory tests using ultrasonic guided waves, the input and
receiving transducers are typically installed at the two exposed
ends of a bolt. This is suitable to laboratory conditions but not
practical in the field because one of the ends of a rock bolt is
embedded in the rock mass. A method needs to be found to install
the receiving transducer at a suitable location in the field for
receiving valid wave data. In this thesis, a practical approach is
proposed for conducting field tests with the installation of the
receiving transducer on the grout surface near the exposed end of
the bolt. The effects of the installation location of the receiving
transducer are studied with
numerical modeling. Experiments are
conducted to verify the
numerical modeling results. The results
indicate that the data obtained from the receiving transducer
installed on the grout surface at a proper location are
representative and can be analyzed through the established
correlations to determine the required parameters. Previous
researches have mostly focused on the feasibility of the ultrasonic
guided wave method for rock bolt tests and on the behavior of
ultrasonic guided waves of fully grouted rock bolts in laboratory
conditions. No further study has been performed to identify the
grout defects in grouted rock bolts. Adequate understanding of the
behaviour of ultrasonic guided waves in rock bolts with defects is
therefore prerequisite for this method to be applied in practice.
This thesis investigates the effects of some typical defects (e.g.,
an insufficient rebar length, a missing grout at the ground end,
and a void in grout) in grouted rock bolts using the developed
field measurement method and
numerical modeling. The results are
verified by laboratory tests using the equipment set-up established
in this research. The results indicate that it is practically
possible to identify those grout defects using ultrasonic guided
waves.
Advisors/Committee Members: Dr. ManChen Ge (external-examiner), Dr. Lei Liu (graduate-coordinator), Dr. Farid Taheir (thesis-reader), Dr. Dmitry Garagah (thesis-reader), Dr. Steve Zou (thesis-supervisor), Not Applicable (ethics-approval), Not Applicable (manuscripts), Not Applicable (copyright-release).
Subjects/Keywords: Numerical modeling; Rock bolt; Guided wave
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APA (6th Edition):
Cui, Y. (2013). NUMERICAL AND EXPERIMENTAL STUDY OF GROUTED ROCK BOLTS AND
THEIR DEFECTS USING ULTRASONIC GUIDED WAVES. (Doctoral Dissertation). Dalhousie University. Retrieved from http://hdl.handle.net/10222/22018
Chicago Manual of Style (16th Edition):
Cui, Yan. “NUMERICAL AND EXPERIMENTAL STUDY OF GROUTED ROCK BOLTS AND
THEIR DEFECTS USING ULTRASONIC GUIDED WAVES.” 2013. Doctoral Dissertation, Dalhousie University. Accessed January 22, 2021.
http://hdl.handle.net/10222/22018.
MLA Handbook (7th Edition):
Cui, Yan. “NUMERICAL AND EXPERIMENTAL STUDY OF GROUTED ROCK BOLTS AND
THEIR DEFECTS USING ULTRASONIC GUIDED WAVES.” 2013. Web. 22 Jan 2021.
Vancouver:
Cui Y. NUMERICAL AND EXPERIMENTAL STUDY OF GROUTED ROCK BOLTS AND
THEIR DEFECTS USING ULTRASONIC GUIDED WAVES. [Internet] [Doctoral dissertation]. Dalhousie University; 2013. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10222/22018.
Council of Science Editors:
Cui Y. NUMERICAL AND EXPERIMENTAL STUDY OF GROUTED ROCK BOLTS AND
THEIR DEFECTS USING ULTRASONIC GUIDED WAVES. [Doctoral Dissertation]. Dalhousie University; 2013. Available from: http://hdl.handle.net/10222/22018
Anna University
12.
Maran P.
Numerical modeling and simulation of linear autogenous
gta welding;.
Degree: Numerical modeling and simulation of linear autogenous
gta welding, 2014, Anna University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/27268
► Gas Tungsten Arc GTA welding has long been used to join newlinematerials in aerospace marine and nuclear power industries Variations in the newlineheat input during…
(more)
▼ Gas Tungsten Arc GTA welding has long been used to
join newlinematerials in aerospace marine and nuclear power
industries Variations in the newlineheat input during GTA welding
of stainless steel have significant effects on newlinethe weld pool
weld bead geometry microstructure and hardness of the weld
newlinemetal and the heat affected zone Apart from melting the
metal heat input newlinecauses liquid motion in the molten weld
pool which in turn affects the bead newlineshape and size Since
1941 the simple conduction based numerical model for newlinewelding
problem has been improved by the proper selection of assumptions
newlinematerial properties boundary conditions and inclusion of all
possible driving newlineforces for weld pool convection To obtain
results for real welding problems newlinethe assumptions have been
minimized at various stages The developments in newlinethe computer
hardware industry during 1980s have accelerated the progress
newlineof modeling of welding Axisymmetric newline
Reference p.211-221
Advisors/Committee Members: Sornakumar T.
Subjects/Keywords: linear autogenous; mechanical engineering; Numerical modeling
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APA (6th Edition):
P, M. (2014). Numerical modeling and simulation of linear autogenous
gta welding;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/27268
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):
P, Maran. “Numerical modeling and simulation of linear autogenous
gta welding;.” 2014. Thesis, Anna University. Accessed January 22, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/27268.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
P, Maran. “Numerical modeling and simulation of linear autogenous
gta welding;.” 2014. Web. 22 Jan 2021.
Vancouver:
P M. Numerical modeling and simulation of linear autogenous
gta welding;. [Internet] [Thesis]. Anna University; 2014. [cited 2021 Jan 22].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/27268.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
P M. Numerical modeling and simulation of linear autogenous
gta welding;. [Thesis]. Anna University; 2014. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/27268
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
13.
Hutschenreuter, Katie Lynn.
Comparison of Results Using the Fine Resolution Environmental HydroDynamic Model with Laboratory PIV Analysis of Vortex Dynamics for Shallow Tidal Inlets.
Degree: MS, Civil Engineering, 2017, Texas A&M University
URL: http://hdl.handle.net/1969.1/161586
► Tidal flows through inlets with vortex formation have long been of great environmental importance. The transport mechanisms between the bay and the ocean must be…
(more)
▼ Tidal flows through inlets with vortex formation have long been of great environmental importance. The transport mechanisms between the bay and the ocean must be well understood to correctly predict the transport of sediment, pollutants, or living organisms. The results from the 3D Fine Resolution Environmental Hydrodynamic (FREHD) model with a hydrostatic pressure assumption and a one equation turbulence model are compared with experimental measurements of surface velocities. The one equation turbulence model was proven to be essential to the model performance. A constant viscosity turbulence model gave poor results in comparison to the experimental data. The FREHD model is able to predict the characteristics of the primary starting-jet vortices with relative accuracy including the trajectory and size of the vortex. The model has limitations on grid resolution which does not allow the high swirl strength in the center of the vortex or any secondary vortices formed by boundary layer separation from the inlet boundary to be predicted by the model. In the experimental data, secondary vortices form and eventually contribute to the total circulation within the primary vortex. Vortices with low circulation also decay faster than observed. The model is able, however, to predict the total circulation well during parts of the tidal cycle when the experimental data does not show secondary vortex formation. A third order upwind advection scheme improved the results of the FREHD model and allowed for higher swirl strength values which increased the amount of total circulation within the primary vortices.
Advisors/Committee Members: Socolofsky, Scott A (advisor), Kaihatu, James (committee member), Hetland, Robert (committee member).
Subjects/Keywords: Tidal vortices; numerical modeling; shallow flow
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APA (6th Edition):
Hutschenreuter, K. L. (2017). Comparison of Results Using the Fine Resolution Environmental HydroDynamic Model with Laboratory PIV Analysis of Vortex Dynamics for Shallow Tidal Inlets. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/161586
Chicago Manual of Style (16th Edition):
Hutschenreuter, Katie Lynn. “Comparison of Results Using the Fine Resolution Environmental HydroDynamic Model with Laboratory PIV Analysis of Vortex Dynamics for Shallow Tidal Inlets.” 2017. Masters Thesis, Texas A&M University. Accessed January 22, 2021.
http://hdl.handle.net/1969.1/161586.
MLA Handbook (7th Edition):
Hutschenreuter, Katie Lynn. “Comparison of Results Using the Fine Resolution Environmental HydroDynamic Model with Laboratory PIV Analysis of Vortex Dynamics for Shallow Tidal Inlets.” 2017. Web. 22 Jan 2021.
Vancouver:
Hutschenreuter KL. Comparison of Results Using the Fine Resolution Environmental HydroDynamic Model with Laboratory PIV Analysis of Vortex Dynamics for Shallow Tidal Inlets. [Internet] [Masters thesis]. Texas A&M University; 2017. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/1969.1/161586.
Council of Science Editors:
Hutschenreuter KL. Comparison of Results Using the Fine Resolution Environmental HydroDynamic Model with Laboratory PIV Analysis of Vortex Dynamics for Shallow Tidal Inlets. [Masters Thesis]. Texas A&M University; 2017. Available from: http://hdl.handle.net/1969.1/161586
Texas A&M University
14.
Ge, Jianchao.
Fractional Diffusion Modeling of Electromagnetic Induction in Fractured Rocks.
Degree: PhD, Geophysics, 2014, Texas A&M University
URL: http://hdl.handle.net/1969.1/153509
► The controlled-source electromagnetic (CSEM) technique is well-established for non-invasive geophysical survey. Due to the strong attenuation of earth materials to electromagnetic signals, the effective depth…
(more)
▼ The controlled-source electromagnetic (CSEM) technique is well-established for non-invasive geophysical survey. Due to the strong attenuation of earth materials to electromagnetic signals, the effective depth of most CSEM surveys is restricted to 1-2 km, a zone where pores and fractures over various length scales are highly complicated. Spatial confinement of fluid or electric charge transport by the fractal geometry gives rise to interesting dynamic processes within the pore space and fractures, such as anomalous diffusion.
Conventionally, CSEM data are interpreted in terms of a 1-D, 2-D or 3-D piecewise constant geological structure with uniform conductivity and thickness of each cell. A very fine grid, and hence a lot of computation time, are needed to build and evaluate a model that can explain the Earths actual 3D CSEM response. Good accuracy may not be captured, using the conventional approach, in the presence of multi-scale hierarchical geoelectrical structure. Alternatively, the CSEM response of such structures are easily evaluated if the physics of anomalous diffusion of electromagnetic
eddy currents is recognized and cast, for example, in terms of a continuous time random walk. Such a re-formulation leads to a generalization of Maxwell equations containing a fractional order time derivative. The fractional order of the derivative is equivalent to a roughening of the geological medium, introducing multi-scale variations of fractures and heterogeneities in a compact manner. This theory renders CSEM
modeling and inversion much more efficient, as only a few model parameters are now required to be fit. However the EM fractional diffusion theory is far from perfect, e.g. the correlation between the roughness of a fracture model with its fracture properties. In this research, I use
numerical modeling tool to answer this question and explore if classical piece-wise constant conductivity model can generate a fractional type response.
In this thesis, I will review the fundamental theory of traditional CSEM survey technique and the continuous time random walk approach, and review the derivation of the generalized Maxwell equation. More importantly, I propose the finite difference method to discrete the generalized Maxwell equation in 2D and 3D. I explore a classical fractured model response created from the von Karman random media approach. I will show that the von Karman fractured model generates a classical type response which is inconsistent with the fractional diffusion response. It is difficult
to generate a classical model numerically that is comparable with the rough natural model.
Advisors/Committee Members: Everett, Mark E (advisor), Gibson, Richard L. (committee member), Sun, Yuefeng (committee member), Pilant, Michael S (committee member), Zhan, Hongbin (committee member).
Subjects/Keywords: CSEM; numerical modeling; fractional diffusion; finite difference
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APA (6th Edition):
Ge, J. (2014). Fractional Diffusion Modeling of Electromagnetic Induction in Fractured Rocks. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/153509
Chicago Manual of Style (16th Edition):
Ge, Jianchao. “Fractional Diffusion Modeling of Electromagnetic Induction in Fractured Rocks.” 2014. Doctoral Dissertation, Texas A&M University. Accessed January 22, 2021.
http://hdl.handle.net/1969.1/153509.
MLA Handbook (7th Edition):
Ge, Jianchao. “Fractional Diffusion Modeling of Electromagnetic Induction in Fractured Rocks.” 2014. Web. 22 Jan 2021.
Vancouver:
Ge J. Fractional Diffusion Modeling of Electromagnetic Induction in Fractured Rocks. [Internet] [Doctoral dissertation]. Texas A&M University; 2014. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/1969.1/153509.
Council of Science Editors:
Ge J. Fractional Diffusion Modeling of Electromagnetic Induction in Fractured Rocks. [Doctoral Dissertation]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/153509
Penn State University
15.
Tipnis, Omkar Pravin.
Numerical and analytical modeling of concrete confined with Frp wraps.
Degree: 2015, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/26340
► This thesis is intended at studying and comparing empirical models that have been proposed for the modeling of the stress-strain response of a FRP confined…
(more)
▼ This thesis is intended at studying and comparing empirical models that have been proposed for the
modeling of the stress-strain response of a FRP confined concrete subjected to axial load. An attempt has been made to model the experimental set up for the compression test of a concrete cylinder confined with FRP sheet in AbaqusCAE. The results so obtained have been compared and analyzed against the experimental test results & the results obtained from a chosen mathematical model (Modified Lam & Teng). An attempt was made to create a new material model in Opensees that follows the chosen mathematical model. However, this was not achieved due to the reasons that will be explained in the later sections.
Reinforced concrete confined with steel is typically designed by considering the Manders model (Mander et al., 1988), which assumes a constant confining pressure. This is true with the case of steel as it is a ductile material and one assumes the steel to be yielded. However with the case of FRP jackets, this is not true. FRP is a linear elastic and brittle material and does not yield, which makes the Manders model inaccurate for its analysis. Many models have been proposed which take into account the increasing confining pressure due to the FRP wrap. A comparative study of the constitutive models proposed for FRP confined reinforced concrete has been done in this study.
Finally after a series of
numerical interpretations of different specimens and their comparison with the experimental data, the utility and accuracy of the new modified Lam & Teng’s model was validated. The validation process included comparison and analytical data obtained via finite element simulation in Abaqus, empirical model results and the experimental data.
The objective is achieved and restricted within the following scope of study:
1) Literature review to identify and choose the most relevant models for
modeling of concrete confined with fiber reinforced polymers in compression.
2) Modelling and finite element analysis of the confined concrete compression test in AbaqusCAE.
3) Developing the stress-strain curve from several proposed empirical model (Modified Lam & Teng).
4) Survey of experimental data on confined concrete with FRP in order to generate an experimental database.
5) Comparison of the analytical results in order to define the strengths and limitations of the empirical model chosen to study.
6) Validation of the model chosen and a study on its relevance for use in typical bridge columns retrofitted with FRP jackets.
7) Proposing changes to the empirical model for more accurate results.
8) Validate the effects of the proposed changes.
Advisors/Committee Members: Dr Maria Lopez De Murphy, Thesis Advisor/Co-Advisor.
Subjects/Keywords: FRP confined concrete; Numerical modeling; Abaqus
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APA (6th Edition):
Tipnis, O. P. (2015). Numerical and analytical modeling of concrete confined with Frp wraps. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/26340
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):
Tipnis, Omkar Pravin. “Numerical and analytical modeling of concrete confined with Frp wraps.” 2015. Thesis, Penn State University. Accessed January 22, 2021.
https://submit-etda.libraries.psu.edu/catalog/26340.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Tipnis, Omkar Pravin. “Numerical and analytical modeling of concrete confined with Frp wraps.” 2015. Web. 22 Jan 2021.
Vancouver:
Tipnis OP. Numerical and analytical modeling of concrete confined with Frp wraps. [Internet] [Thesis]. Penn State University; 2015. [cited 2021 Jan 22].
Available from: https://submit-etda.libraries.psu.edu/catalog/26340.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Tipnis OP. Numerical and analytical modeling of concrete confined with Frp wraps. [Thesis]. Penn State University; 2015. Available from: https://submit-etda.libraries.psu.edu/catalog/26340
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Penn State University
16.
Siddique, Ridwan.
IMPROVING MEDIUM-RANGE STREAMFLOW FORECASTING ACROSS U.S. MIDDLE ATLANTIC REGION.
Degree: 2017, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/13998rxs490
► Short- to medium-range (forecast lead times from 0 to 14 days) streamflow forecasts are subject to uncertainties from various sources. A major source of uncertainty…
(more)
▼ Short- to medium-range (forecast lead times from 0 to 14 days) streamflow forecasts are
subject to uncertainties from various sources. A major source of uncertainty is due to the weather or meteorological forcing. In turn, the uncertainties from the meteorological forcing are propagated into the streamflow forecasts when using the meteorological forecasts (i.e., the outputs from a
Numerical Weather Prediction (NWP) model) as forcing to hydrological models. Additionally, the hydrological models themselves are another important source of uncertainty, where uncertainty arises from model structure, parameters, initial and boundary conditions. To advance the science of hydrological
modeling and forecasting, these uncertainties need to be quantified and modeled, using novel statistical techniques and robust verification strategies, with the goal of improving the skill and reliability of streamflow forecasts. This, ultimately, may allow generating in advance (i.e., with longer lead times) more informative forecasts, which could eventually translate into better emergency preparedness and response.
The main research goal of this dissertation is to develop, implement and verify a new regional hydrological ensemble prediction system (RHEPS), comprised by a
numerical weather prediction (NWP) model, different hydrological models and different statistical bias-correction techniques. To implement and verify the new RHEPS, the U.S. middle Atlantic region (MAR) is selected as the study area. This is a region of high socio-economic value with populated cities and, at the same time, vulnerable to floods and other natural disasters. To meet my research goal, the following objectives are carried out: Objective 1 (O1) - To choose a relevant NWP model or system by evaluating and verifying the outputs from different meteorological forecasting systems (i.e., the outputs or forecasts from their underlying NWP models); Objective 2 (O2) - To verify streamflow forecasts generated by forcing a distributed hydrological model with meteorological ensembles, and to develop and evaluate a statistical postprocessor to quantify the uncertainty and adjust biases in the streamflow forecasts; Objective 3 (O3) - To develop, implement and rigorously verify a multimodel approach for short- to medium-range streamflow forecasting. The overarching hypothesis of this dissertation is that the combination and configuration of the different system components in the streamflow forecasting system can have a significant influence on forecast uncertainty and that hydrological multimodeling is able to significantly enhance the quality of streamflow forecasts. The RHEPS is used to test this hypothesis.
To meet O1, precipitation ensemble forecasts from two different NWP models are verified. The two NWP models are the National Centers for Environmental Prediction (NCEP) 11-member Global Ensemble Forecast System Reforecast version 2 (GEFSRv2) and the 21-member Short Range Ensemble Forecast (SREF) system. The verification results for O1 reveal the quality of the…
Advisors/Committee Members: Alfonso Mejia, Dissertation Advisor/Co-Advisor, Alfonso Mejia, Committee Chair/Co-Chair, Christopher Duffy, Committee Member, Xiaofeng Liu, Committee Member, Fuqing Zhang, Outside Member, Seann Reed, Special Member.
Subjects/Keywords: Hydrological modeling; Hydrological forecasting; Numerical weather prediction
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APA (6th Edition):
Siddique, R. (2017). IMPROVING MEDIUM-RANGE STREAMFLOW FORECASTING ACROSS U.S. MIDDLE ATLANTIC REGION. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/13998rxs490
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):
Siddique, Ridwan. “IMPROVING MEDIUM-RANGE STREAMFLOW FORECASTING ACROSS U.S. MIDDLE ATLANTIC REGION.” 2017. Thesis, Penn State University. Accessed January 22, 2021.
https://submit-etda.libraries.psu.edu/catalog/13998rxs490.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Siddique, Ridwan. “IMPROVING MEDIUM-RANGE STREAMFLOW FORECASTING ACROSS U.S. MIDDLE ATLANTIC REGION.” 2017. Web. 22 Jan 2021.
Vancouver:
Siddique R. IMPROVING MEDIUM-RANGE STREAMFLOW FORECASTING ACROSS U.S. MIDDLE ATLANTIC REGION. [Internet] [Thesis]. Penn State University; 2017. [cited 2021 Jan 22].
Available from: https://submit-etda.libraries.psu.edu/catalog/13998rxs490.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Siddique R. IMPROVING MEDIUM-RANGE STREAMFLOW FORECASTING ACROSS U.S. MIDDLE ATLANTIC REGION. [Thesis]. Penn State University; 2017. Available from: https://submit-etda.libraries.psu.edu/catalog/13998rxs490
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Waterloo
17.
Soltani, Madjid.
Numerical Modeling of Drug Delivery to Solid Tumor Microvasculature.
Degree: 2013, University of Waterloo
URL: http://hdl.handle.net/10012/7278
► Modeling interstitial fluid flow involves processes such as fluid diffusion, convective transport in the extracellular matrix, and extravasation from blood vessels. In all of these…
(more)
▼ Modeling interstitial fluid flow involves processes such as fluid diffusion, convective transport in the extracellular matrix, and extravasation from blood vessels. In all of these processes, computational fluid dynamics can play a crucial role in elucidating the mechanisms of fluid flow in solid tumors and surrounding tissues. To date, microvasculature flow modeling has been most extensively studied with simple tumor shapes and their capillaries at different levels and scales. With our proposed numerical model, however, more complex and realistic tumor shapes and capillary networks can be studied.
First, a mathematical model of interstitial fluid flow is developed, based on the application of the governing equations for fluid flow, i.e., the conservation laws for mass and momentum, to physiological systems containing solid tumors. Simulations of interstitial fluid transport in a homogeneous solid tumor demonstrate that, in a uniformly perfused tumor, i.e., one with no necrotic region, the interstitial pressure distribution results in a non-uniform distribution of drug particles. Pressure distribution for different values of necrotic radii is examined, and two new parameters, the critical tumor radius and critical necrotic radius, are defined. In specific ranges of these critical dimensions the interstitial fluid pressure is relatively lower, which in turn leads to a diminished opposing force against drug movement and a subsequently higher drug concentration and potentially enhanced therapeutic effects.
In this work, the numerical model of fluid flow in solid tumors is further developed to incorporate and investigate non-spherical tumor shapes such as prolate and oblate ones. Using this enhanced model, tumor shape and size effects on drug delivery to solid tumors are then studied. Based on the assumption that drug particles flow with the interstitial fluid, the pressure and velocity maps of the latter are used to illustrate the drug delivery pattern in a solid tumor. Additionally, the effects of the surface area per unit volume of the tissue, as well as vascular and interstitial hydraulic conductivity on drug delivery efficiency, are investigated.
Using a tumor-induced microvasculature architecture instead of a uniform distribution of vessels provides a more realistic model of solid tumors. To this end, continuous and discrete mathematical models of angiogenesis were utilized to observe the effect of matrix density and matrix degrading enzymes on capillary network formation in solid tumors. Additionally, the interactions between matrix-degrading enzymes, the extracellular matrix and endothelial cells are mathematically modeled. Existing continuous and discrete models of angiogenesis were modified to impose the effect of matrix density on the solution. The imposition has been performed by a specific function in movement potential. Implementing realistic boundary and initial conditions showed that, unlike in previous models, the endothelial cells accelerate as they migrate toward the tumor. Now, the…
Subjects/Keywords: Drug delivery; Solid tumor; Numerical modeling; Microvasculature
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APA ·
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MLA ·
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CSE |
Export
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Manager
APA (6th Edition):
Soltani, M. (2013). Numerical Modeling of Drug Delivery to Solid Tumor Microvasculature. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/7278
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):
Soltani, Madjid. “Numerical Modeling of Drug Delivery to Solid Tumor Microvasculature.” 2013. Thesis, University of Waterloo. Accessed January 22, 2021.
http://hdl.handle.net/10012/7278.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Soltani, Madjid. “Numerical Modeling of Drug Delivery to Solid Tumor Microvasculature.” 2013. Web. 22 Jan 2021.
Vancouver:
Soltani M. Numerical Modeling of Drug Delivery to Solid Tumor Microvasculature. [Internet] [Thesis]. University of Waterloo; 2013. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10012/7278.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Soltani M. Numerical Modeling of Drug Delivery to Solid Tumor Microvasculature. [Thesis]. University of Waterloo; 2013. Available from: http://hdl.handle.net/10012/7278
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Penn State University
18.
Zeinijahromi, Mohamad.
Development Of A Three-dimensional, Three-phase Coupled Model For Simulating Hydraulic Fracture Propagation And Long-term Recovery In Tight Gas Reservoirs.
Degree: 2013, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/19717
► In the past decades, development of tight gas reservoirs has become more important. These low permeability reservoirs need to be stimulated effectively with hydraulic fracturing…
(more)
▼ In the past decades, development of tight gas reservoirs has become more important. These low permeability reservoirs need to be stimulated effectively with hydraulic fracturing to produce economically. Stimulation design has improved with better understanding these unconventional reservoirs, advances in
modeling and study of flow mechanisms.
Conventional fracture propagation models predict fracture geometry based on fracture fluid mechanics, rock mechanics, petrophysics and empirical/analytical leak-off models. Reservoir flow simulators are then used to evaluate post-fracture well performances. These approaches are called de-coupled
modeling. It is a challenge to couple these two processes, particularly when dealing with large amounts of input data. Furthermore decoupled
modeling is a time-intensive job that requires a coordinated effort from stimulation and reservoir engineers. This approach may not work in low-permeability reservoirs because the hydraulic fracture propagation is complex, fracture fluid leak-off is pressure/reservoir/fracture dependent and there are changes in in-situ stress and permeability during and after a fracture treatment. It has been recognized that fluid loss can be computed directly by solving the multiphase flow equations in porous media. Such an approach is more general and does not have many of the assumptions in decoupled models. Models based on this approach are called coupled models. Hydraulic fracturing is an integrated process of injection of fracture fluid, fracture propagation, proppant transport, clean-up and multi-phase flow through the reservoir. Available coupled models are not fully integrated as they were developed to simulate just one or two of these steps.
The main objective of this research is to develop an integrated coupled model which is capable of fully simulating reservoir flow, fracture propagation, proppant distribution, flowback, long term gas recovery and resulted stress change through a stationary reservoir/stress grid system. The model uses a three-dimensional, three-phase finite difference reservoir flow simulator coupled with a finite difference geomechanics model where both are applied on the same grid system. The model has been validated with published data in the literature.
Using the developed model, parametric studies have been carried out to quantify important factors affecting fracture and recovery processes such as injection rate, treatment volume, proppant type, flowback rate and flowing bottom hole pressure (FBHP). The model enables us to simulate and compare different scenarios and suggest the optimized hydraulic fracturing design. The new findings lead to better understandings of hydraulic fracturing and well performances in tight gas reservoirs.
Advisors/Committee Members: Yilin Wang, Dissertation Advisor/Co-Advisor, Turgay Ertekin, Dissertation Advisor/Co-Advisor, Russell Taylor Johns, Committee Member, Terry Engelder, Committee Member.
Subjects/Keywords: Numerical Modelilng; Hydraulic Fracturing Modeling; Reservoir Simulation
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APA ·
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MLA ·
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Export
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APA (6th Edition):
Zeinijahromi, M. (2013). Development Of A Three-dimensional, Three-phase Coupled Model For Simulating Hydraulic Fracture Propagation And Long-term Recovery In Tight Gas Reservoirs. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/19717
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):
Zeinijahromi, Mohamad. “Development Of A Three-dimensional, Three-phase Coupled Model For Simulating Hydraulic Fracture Propagation And Long-term Recovery In Tight Gas Reservoirs.” 2013. Thesis, Penn State University. Accessed January 22, 2021.
https://submit-etda.libraries.psu.edu/catalog/19717.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Zeinijahromi, Mohamad. “Development Of A Three-dimensional, Three-phase Coupled Model For Simulating Hydraulic Fracture Propagation And Long-term Recovery In Tight Gas Reservoirs.” 2013. Web. 22 Jan 2021.
Vancouver:
Zeinijahromi M. Development Of A Three-dimensional, Three-phase Coupled Model For Simulating Hydraulic Fracture Propagation And Long-term Recovery In Tight Gas Reservoirs. [Internet] [Thesis]. Penn State University; 2013. [cited 2021 Jan 22].
Available from: https://submit-etda.libraries.psu.edu/catalog/19717.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Zeinijahromi M. Development Of A Three-dimensional, Three-phase Coupled Model For Simulating Hydraulic Fracture Propagation And Long-term Recovery In Tight Gas Reservoirs. [Thesis]. Penn State University; 2013. Available from: https://submit-etda.libraries.psu.edu/catalog/19717
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Toronto
19.
Radulj, Djordje.
Assessing the Hydraulic Transient Performance of Water and Wastewater Systems Using Field and Numerical Modeling Data.
Degree: 2010, University of Toronto
URL: http://hdl.handle.net/1807/24625
► A large proportion of water and wastewater systems have traditionally been analyzed and designed without the consideration of the nature, risk, and potential consequence of…
(more)
▼ A large proportion of water and wastewater systems have traditionally been analyzed and designed without the consideration of the nature, risk, and potential consequence of hydraulic transients. Recent advancements in numerical hydraulic modeling have spawned a specialty hydraulic field based on numerical transient analysis. The current practice within this field often lacks physical understanding and can be misguided by both the current knowledge, technology based limitations, and by the sole reliance on numerical models. This thesis aims to provide insights into some of the shortcomings of current practice and to develop the importance and application of field data based confirmations. The thesis examines the advances in the current field oriented technology for recording transient pressures, and provides examples and insights on how this data can be used both in conjunction with numerical modeling and on its own as a first step to a proposed frequency based transient risk assessment methodology. The thesis establishes definitions and a preliminary methodology for a Transient Risk Index.
MAST
Advisors/Committee Members: Karney, Bryan William, Civil Engineering.
Subjects/Keywords: hydraulic transients; numerical modeling; 0543; 0775
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MLA ·
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APA (6th Edition):
Radulj, D. (2010). Assessing the Hydraulic Transient Performance of Water and Wastewater Systems Using Field and Numerical Modeling Data. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/24625
Chicago Manual of Style (16th Edition):
Radulj, Djordje. “Assessing the Hydraulic Transient Performance of Water and Wastewater Systems Using Field and Numerical Modeling Data.” 2010. Masters Thesis, University of Toronto. Accessed January 22, 2021.
http://hdl.handle.net/1807/24625.
MLA Handbook (7th Edition):
Radulj, Djordje. “Assessing the Hydraulic Transient Performance of Water and Wastewater Systems Using Field and Numerical Modeling Data.” 2010. Web. 22 Jan 2021.
Vancouver:
Radulj D. Assessing the Hydraulic Transient Performance of Water and Wastewater Systems Using Field and Numerical Modeling Data. [Internet] [Masters thesis]. University of Toronto; 2010. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/1807/24625.
Council of Science Editors:
Radulj D. Assessing the Hydraulic Transient Performance of Water and Wastewater Systems Using Field and Numerical Modeling Data. [Masters Thesis]. University of Toronto; 2010. Available from: http://hdl.handle.net/1807/24625
Univerzitet u Beogradu
20.
Vujadinović Mandić, Mirjam P. 1982-.
Modeliranje hidrološkog ciklusa u integrisanom
geofizičkom sistemu.
Degree: Fizički fakultet, 2016, Univerzitet u Beogradu
URL: https://fedorabg.bg.ac.rs/fedora/get/o:11238/bdef:Content/get
► Dinamička meteorologija / Dynamical meteorology
Hidrološki ciklus u integrisanom geofizičkom sistemu ima ulogu da simulira procese vezane za kopnene vode i međusobne interakcije komponenti klimatskog…
(more)
▼ Dinamička meteorologija / Dynamical
meteorology
Hidrološki ciklus u integrisanom geofizičkom
sistemu ima ulogu da simulira procese vezane za kopnene vode i
međusobne interakcije komponenti klimatskog sistema koji opisuju
kruženje vode u prirodi. Numerički modeli za prognozu vremena i
simulaciju klime obuhvataju najveći deo ovih procesa i razvojem
računarskih resursa postaju kompleksniji i prerastaju u modele za
simulaciju celog geofizičkog sistema. Hidrološki ciklus u
operativnim modelima nije zatvoren zbog nedostatka dinamičkog
modela koji simulira kopneni oticaj vode. U ovom radu je
predstavljen numerički model za simulaciju i prognozu površinskog
oticaja koji direktno utiče na stanje podloge, što je donji
granični uslov za atmosferske procese i prognozu vremena. Model je
razvijen u skladu sa modelom za prognozu vremena poslednje
generacije, NMMB, koji ima sposobnost da simulira procese od
globalnih do lokalnih razmera. Testiranje numeričke ispravnosti
nove komponente hidrološkog ciklusa kvalifikovalo ga je za
povezivanje sa atmosferskim modelom. Povezani numerički model sa
zatvorenim hidrološkim ciklusom otvara mogućnost za poboljšanje
kvaliteta prognoza i klimatskih simulacija i uvodi nove
prognostičke produkte koji mogu naći upotrebu u sistemima najava i
upozorenja na ekstremne vremenske prilike. Upotreba ovakvog modela
u operativnoj prognozi demonstrirana je na primeru simulacije
majskih poplava 2014. godine u oblasti zapadnog Balkana. Povezani
model je uspešno reprodukovao hidrološki ciklus ove vremenske
nepogode, tj. intenzivne padavine, njihovo oticanje po površini i
akumulaciju, uključujući njegovu interakciju sa podlogom i
atmosferom, sve do porasta signala u rečnom toku, u skladu sa
osmatranjim
Advisors/Committee Members: Rajković, Borivoj. 1948-.
Subjects/Keywords: hydrological cycle; geophysical system; numerical
modeling
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APA (6th Edition):
Vujadinović Mandić, M. P. 1. (2016). Modeliranje hidrološkog ciklusa u integrisanom
geofizičkom sistemu. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:11238/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):
Vujadinović Mandić, Mirjam P 1982-. “Modeliranje hidrološkog ciklusa u integrisanom
geofizičkom sistemu.” 2016. Thesis, Univerzitet u Beogradu. Accessed January 22, 2021.
https://fedorabg.bg.ac.rs/fedora/get/o:11238/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):
Vujadinović Mandić, Mirjam P 1982-. “Modeliranje hidrološkog ciklusa u integrisanom
geofizičkom sistemu.” 2016. Web. 22 Jan 2021.
Vancouver:
Vujadinović Mandić MP1. Modeliranje hidrološkog ciklusa u integrisanom
geofizičkom sistemu. [Internet] [Thesis]. Univerzitet u Beogradu; 2016. [cited 2021 Jan 22].
Available from: https://fedorabg.bg.ac.rs/fedora/get/o:11238/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:
Vujadinović Mandić MP1. Modeliranje hidrološkog ciklusa u integrisanom
geofizičkom sistemu. [Thesis]. Univerzitet u Beogradu; 2016. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:11238/bdef:Content/get
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
21.
Jongedijk, C.E. (author).
Using a transfer matrix based on 10 CMIP5 models for ENSO prediction.
Degree: 2017, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:14af7c9f-b1c0-4af5-9a91-20b261493b15
► Additional Thesis work performed as part of the master Hydraulic Engineering at Delft University of Technology in collaboration with University of Southampton, Ocean and Earth…
(more)
▼ Additional Thesis work performed as part of the master Hydraulic Engineering at Delft University of Technology in collaboration with University of Southampton, Ocean and Earth Sciences, Physical Oceanography - In this research the outcome of several realisations of 10 different models from the CMIP5 program is used to predict the El Niño/Southern Oscillation (ENSO).With her extreme phases ’El Niño’ and ’La Niña’, ENSO is probably the most infamous oceanographic and climate phenomenon in the physical climate system with a great influence on the world’s climate and weather systems. Despite the fame amongst public and the high importance in research programmes throughout the last decades, the potential causes, cyclicity patterns and the possible forcing of ENSO are still not fully understood. Even with state of the art models its predictability (up to 12 months ahead) remains quite low compared to the time scale of the phenomenon (2-5 years). In this study a statistical model is developed to predict ENSO with a transfer operator framework based on model output from 10 models. This method is based on a recent study by Sévellec [19] and transforms a deterministic single time series evolution of sea surface temperature in the Tropical Pacific, extracted from existing coupled atmosphere-ocean model data, into a probabilistic method to determine the evolution of an observational initial condition in time. The main goal of this research is to explore and define by means of hindcasting (predicting the past) the predictive skills and reliability of this statistical method. The results show that the reliability is similar to previous studies. Where the most computational extensive coupled ocean-atmosphere models show a good prediction skill up to 9 months, with this quick model a similar skill is sustained up to a prediction window of 5 months. Since this is the first time this method applied on ENSO, recommendations are done for further development of the model as well as for the application on ENSO. Suggestions for potential other systems this model could be applied to are made.
Civil Engineering and Geosciences
Hydraulic Engineering
Environmental Fluid Mechanics
Advisors/Committee Members: Katsman, C. (mentor), Sévellec, F. (mentor), de Vries, S. (mentor), Drijfhout, S. (mentor).
Subjects/Keywords: physical oceanography; numerical modeling; climate variability; ENSO
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APA (6th Edition):
Jongedijk, C. E. (. (2017). Using a transfer matrix based on 10 CMIP5 models for ENSO prediction. (Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:14af7c9f-b1c0-4af5-9a91-20b261493b15
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):
Jongedijk, C E (author). “Using a transfer matrix based on 10 CMIP5 models for ENSO prediction.” 2017. Thesis, Delft University of Technology. Accessed January 22, 2021.
http://resolver.tudelft.nl/uuid:14af7c9f-b1c0-4af5-9a91-20b261493b15.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Jongedijk, C E (author). “Using a transfer matrix based on 10 CMIP5 models for ENSO prediction.” 2017. Web. 22 Jan 2021.
Vancouver:
Jongedijk CE(. Using a transfer matrix based on 10 CMIP5 models for ENSO prediction. [Internet] [Thesis]. Delft University of Technology; 2017. [cited 2021 Jan 22].
Available from: http://resolver.tudelft.nl/uuid:14af7c9f-b1c0-4af5-9a91-20b261493b15.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Jongedijk CE(. Using a transfer matrix based on 10 CMIP5 models for ENSO prediction. [Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:14af7c9f-b1c0-4af5-9a91-20b261493b15
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
22.
Cai, Ruolin (author).
Two-Dimensional Numerical Modeling and Design Optimization of a Moored Buoy Under Ice Load.
Degree: 2018, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:d8b1fc1d-c74c-4192-ba39-9a4b07d1899d
► A single point mooring (SPM) system is one of the possible mooring systems in the field of Arctic floating production. It consists of a moored…
(more)
▼ A single point mooring (SPM) system is one of the possible mooring systems in the field of Arctic floating production. It consists of a moored buoy to provide its anchoring unit with the capacity of mooring and ice sheltering. In the preliminary design phase, the performance of the mooring buoy must be assessed. This can be done by numerical modeling. This thesis provides a model for the two-dimensional numerical simulation of a moored buoy under ice loading, and it optimizes the buoy design based on the results of the numerical simulation. The model is constructed based on the discrete element method (DEM), where the elements consist of the elements describing the level ice, and one element describing the buoy. The numerical model is capable of simulating several ice-structure interaction mechanisms, including the ice compressive failure, the ice bending failure, and friction. The model consists of three parts. A compliant contact formulation describes the behavior of contacts between elements. Contact forces are solved implicitly using a Lagrange multiplier formulation. Lastly, the mooring system is described using the catenary equation. The model is validated against a number of analytical solutions, demonstrating that the model is capable of simulating the buoy-ice interaction. An example of the buoy design optimization process is demonstrated. The optimization aims to obtain a concept design of a satisfactorily performing moored buoy with minimized dimensions under a specific ice condition. Design criteria were determined for the maximum pitch angle and the maximum horizontal displacement of the buoy. Given the desired design criteria, one can obtain the most optimized buoy design after several phases of selection.
Offshore and Dredging Engineering
Advisors/Committee Members: Hoving, Jeroen (mentor), van den Berg, Marnix (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: two-dimensional; mooring system; numerical modeling; buoy
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to Zotero / EndNote / Reference
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APA (6th Edition):
Cai, R. (. (2018). Two-Dimensional Numerical Modeling and Design Optimization of a Moored Buoy Under Ice Load. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:d8b1fc1d-c74c-4192-ba39-9a4b07d1899d
Chicago Manual of Style (16th Edition):
Cai, Ruolin (author). “Two-Dimensional Numerical Modeling and Design Optimization of a Moored Buoy Under Ice Load.” 2018. Masters Thesis, Delft University of Technology. Accessed January 22, 2021.
http://resolver.tudelft.nl/uuid:d8b1fc1d-c74c-4192-ba39-9a4b07d1899d.
MLA Handbook (7th Edition):
Cai, Ruolin (author). “Two-Dimensional Numerical Modeling and Design Optimization of a Moored Buoy Under Ice Load.” 2018. Web. 22 Jan 2021.
Vancouver:
Cai R(. Two-Dimensional Numerical Modeling and Design Optimization of a Moored Buoy Under Ice Load. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Jan 22].
Available from: http://resolver.tudelft.nl/uuid:d8b1fc1d-c74c-4192-ba39-9a4b07d1899d.
Council of Science Editors:
Cai R(. Two-Dimensional Numerical Modeling and Design Optimization of a Moored Buoy Under Ice Load. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:d8b1fc1d-c74c-4192-ba39-9a4b07d1899d
Delft University of Technology
23.
Cejudo Grano de Oro, Jose Eduardo (author).
Coupling of isothermal models in gas networks.
Degree: 2019, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:52d16e2f-ea29-4092-b1c6-bb0980d54114
► This work is concerned with the simulation of gas networks using a hybrid modeling approach where different pipes are described withmodels belonging to the isothermal…
(more)
▼ This work is concerned with the simulation of gas networks using a hybrid
modeling approach where different pipes are described withmodels belonging to the isothermal model hierarchy. It makes special emphasis in the coupling of algebraic and transient models and their effects in both steady-state and transient regime. The transient behavior of simple networks is studied in both non-dissipative and dissipative regime with a perturbation analysis. Physical effects concerning transmission and reflection of perturbations are studied both
numerical and analytically. The transient response of the algebraic model is studied and compared with the results of
numerical experiments. Finally a perturbative approach for computing the attenuation coefficient for dissipative transport is proposed and the analytical results are compared with the
numerical experiments.
Advisors/Committee Members: Romate, Johan (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: gas networks; multiscale modeling; numerical methods
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APA (6th Edition):
Cejudo Grano de Oro, J. E. (. (2019). Coupling of isothermal models in gas networks. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:52d16e2f-ea29-4092-b1c6-bb0980d54114
Chicago Manual of Style (16th Edition):
Cejudo Grano de Oro, Jose Eduardo (author). “Coupling of isothermal models in gas networks.” 2019. Masters Thesis, Delft University of Technology. Accessed January 22, 2021.
http://resolver.tudelft.nl/uuid:52d16e2f-ea29-4092-b1c6-bb0980d54114.
MLA Handbook (7th Edition):
Cejudo Grano de Oro, Jose Eduardo (author). “Coupling of isothermal models in gas networks.” 2019. Web. 22 Jan 2021.
Vancouver:
Cejudo Grano de Oro JE(. Coupling of isothermal models in gas networks. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Jan 22].
Available from: http://resolver.tudelft.nl/uuid:52d16e2f-ea29-4092-b1c6-bb0980d54114.
Council of Science Editors:
Cejudo Grano de Oro JE(. Coupling of isothermal models in gas networks. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:52d16e2f-ea29-4092-b1c6-bb0980d54114
24.
Stephenson, Andrew Wataru.
Numerical Modeling Techniques of High-Speed Rail Bridge Structures.
Degree: 2020, University of Nevada – Reno
URL: http://hdl.handle.net/11714/7613
► High-speed rail (HSR) is a complex system incorporating various technical aspects such as infrastructure, rolling stock (specially-designed train sets), telecommunications, operating conditions, and equipment. The…
(more)
▼ High-speed rail (HSR) is a complex system incorporating various technical aspects such as infrastructure, rolling stock (specially-designed train sets), telecommunications, operating conditions, and equipment. The highly sophisticated technology combining these elements, as well as the elements themselves continue to evolve as the new transportation mode continues to expand and its intrinsic characteristics pose design issues unique to HSR systems. With the requirements for deflections, rotations, and natural frequencies of HSR bridge structures, comprehensive understanding of the HSR dynamic interactions is a topic of growing interest. Accordingly, many studies over the past few decades have been conducted, mostly internationally, with a focus on dynamic interaction between the different components of HSR train/bridge systems through sophisticated structural models. The focus of this research is to identify these
modeling features and inherent characteristics of HSR bridges, and to provide guidance and demonstration examples on how to develop such models in OpenSees. Such models will aid researchers and designers in conducting parametric studies to test the static, modal, and dynamic performance of future HSR bridge designs to formulate a national standard for HSR infrastructure in the United States.The main objective of this study was to create a comprehensive
modeling guideline for HSR bridge systems. To do so, a thorough literature review was conducted to synthesize various methods of
numerical modeling techniques used to model HSR systems. Literature published from national and international sources were reviewed and compiled to demonstrate how the individual components within a train system, track system, and bridge system have been modeled in previous studies. The synthesis also identified the similarities and differences regarding the different finite element
modeling techniques for different components. Based on the studies analyzed in the literature search, a prototype train system and track-bridge system were selected to construct a fully detailed example HSR bridge model. The prototypes were selected based on available information regarding the design of the prototype components to minimize assumptions necessary to model the prototype system. A step-by-step guide of the processes of formulating the model and analysis parameters from start to finish were documented, accompanied by snapshots from a sample OpenSees model input file for guidance and future use.To exemplify potential use of the developed model for informing future designs using OpenSees data output, sample static and dynamic analyses were performed with load cases without train loading and with train loading on the prototype HSR bridge. Additionally, a brief analytical study was performed to demonstrate the HSR bridge seismic performance using three different ground motions. The ground motions were retrieved from the PEER Ground Motion Database and were amplified to various degrees to perform nonlinear time history analysis. The nonlinear…
Advisors/Committee Members: Moustafa, Mohamed A (advisor), Seylabi, Elnaz E (committee member), Livani, Hanif (committee member).
Subjects/Keywords: High Speed Rail; HSR; Numerical Modeling
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Manager
APA (6th Edition):
Stephenson, A. W. (2020). Numerical Modeling Techniques of High-Speed Rail Bridge Structures. (Thesis). University of Nevada – Reno. Retrieved from http://hdl.handle.net/11714/7613
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):
Stephenson, Andrew Wataru. “Numerical Modeling Techniques of High-Speed Rail Bridge Structures.” 2020. Thesis, University of Nevada – Reno. Accessed January 22, 2021.
http://hdl.handle.net/11714/7613.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Stephenson, Andrew Wataru. “Numerical Modeling Techniques of High-Speed Rail Bridge Structures.” 2020. Web. 22 Jan 2021.
Vancouver:
Stephenson AW. Numerical Modeling Techniques of High-Speed Rail Bridge Structures. [Internet] [Thesis]. University of Nevada – Reno; 2020. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/11714/7613.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Stephenson AW. Numerical Modeling Techniques of High-Speed Rail Bridge Structures. [Thesis]. University of Nevada – Reno; 2020. Available from: http://hdl.handle.net/11714/7613
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
25.
Raimundo, Gabriela.
Numerical modelling of microplastics transport and accumulation throughout Portuguese coast
.
Degree: 2019, Universidade de Aveiro
URL: http://hdl.handle.net/10773/29445
► Microplastic (MP) accumulation and dispersal is a growing problem at a global marine scale. The accumulation of MPs in aquatic systems is increasing due to…
(more)
▼ Microplastic (MP) accumulation and dispersal is a growing problem at a global marine scale. The accumulation of MPs in aquatic systems is increasing due to their high perseverance and inadequate management, affecting all marine environments and adversely impacting ecosystem services and even human health. The study of these contaminants, namely their concentration and spatial distribution, as well as their physical characteristics, is fundamental to mitigate and reduce the associated risks. Due to the high population density on the Portuguese coast, this area is a zone of high contamination by MPs, being the rivers their main transport mode to coastal waters. In order to understand the distributions of MPs and the way they evolve in space and time, is essential to develop studies in this area. Thus, the purpose of this study is to simulate the transport and accumulation of MPs along the Portuguese coast and adjacent waters. The methodology followed comprised the development and implementation of a three-dimensional model using the Delft3D suite, coupling the Flow and particle-tracking (D-WAQ PART) models. Three scenarios were created: scenario 1 aims to comprehend the trajectory of the MPs of different diameters and types; scenario 2 was developed to understand the distribution and accumulation zones of MPs released per river; and scenario 3 aims to assess the effect of wind on the MPs fate. The simulations show that all MPs move to north in winter and tend to stay close to the release point in summer, following the local hydrodynamics. The higher density and larger MPs tend to sink more than those of lower density and smaller dimension, which in turn tend to travel longer distances. The effect of wind on the distribution of MPs, regardless of direction and season, favors the sinking of particles and dispersion off the platform. The main factors that influence the distribution and accumulation of MPs in the study area are the local hydrodynamic and geomorphology, followed by the diameter of the MPs. This study contributes to improve the understanding about the fate and transport of MPs along the Portuguese coast and to detect critical accumulation zones.
Advisors/Committee Members: Dias, João Miguel Sequeira Silva (advisor), Sousa, Magda Catarina Ferreira de (advisor).
Subjects/Keywords: Numerical modeling;
Microplastics;
Particles;
Portuguese coast;
Delft3D
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APA (6th Edition):
Raimundo, G. (2019). Numerical modelling of microplastics transport and accumulation throughout Portuguese coast
. (Thesis). Universidade de Aveiro. Retrieved from http://hdl.handle.net/10773/29445
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):
Raimundo, Gabriela. “Numerical modelling of microplastics transport and accumulation throughout Portuguese coast
.” 2019. Thesis, Universidade de Aveiro. Accessed January 22, 2021.
http://hdl.handle.net/10773/29445.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Raimundo, Gabriela. “Numerical modelling of microplastics transport and accumulation throughout Portuguese coast
.” 2019. Web. 22 Jan 2021.
Vancouver:
Raimundo G. Numerical modelling of microplastics transport and accumulation throughout Portuguese coast
. [Internet] [Thesis]. Universidade de Aveiro; 2019. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10773/29445.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Raimundo G. Numerical modelling of microplastics transport and accumulation throughout Portuguese coast
. [Thesis]. Universidade de Aveiro; 2019. Available from: http://hdl.handle.net/10773/29445
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Queens University
26.
Bryck, Sean.
Numerical Modeling of Thermal Enhancement of In Situ Chemical Oxidation (ISCO) and Enhanced In Situ Bioremediation (EISB)
.
Degree: Civil Engineering, 2014, Queens University
URL: http://hdl.handle.net/1974/8627
► A numerical model was utilized to assess the effects of elevated temperature on the application of in situ chemical oxidation (ISCO) and enhanced in situ…
(more)
▼ A numerical model was utilized to assess the effects of elevated temperature on the application of in situ chemical oxidation (ISCO) and enhanced in situ bioremediation (EISB) for the subsurface remediation of trichloroethene (TCE) and tetrachloroethene (PCE). Temperature adjustment of the contaminant physicochemical properties as well as the chemical/biological reactions associated with ISCO and EISB were accounted for in the model domain. ISCO reaction rates were estimated using Arrhenius principles; microbial growth rates for EISB were estimated using non-linear fits to published literature data. The results from this study showed that temperature did provide remedial benefits to ISCO and EISB treatment during the short-term timeframe of oxidant/substrate injection. During these time periods, heated ISCO and EISB treatment exhibited greater DNAPL mass removal and mass flux reduction compared to heated abiotic dissolution. In the long term, after oxidant/substrate injection was terminated, the treatment enhancements achieved by ISCO and EISB were negated. Permeability (k) reduction due to rind formation (ISCO) and bioclogging (EISB) inhibited DNAPL dissolution and contributed to greater dissolution tailing effects. Tailing effects caused by ISCO were more severe compared to EISB since rind formation contributed to permanent k reduction; partial k recovery was observed in the EISB scenarios due to biomass decay. Even though higher temperatures were beneficial to ISCO and EISB during the short-term oxidant/substrate injection period, treatment efficacy was ultimately controlled by the detrimental by-products (rind from ISCO and biomass from EISB) formed as a result of the associative chemical/biological reactions.
Subjects/Keywords: DNAPL
;
Subsurface Contamination
;
Groundwater
;
Numerical Modeling
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APA (6th Edition):
Bryck, S. (2014). Numerical Modeling of Thermal Enhancement of In Situ Chemical Oxidation (ISCO) and Enhanced In Situ Bioremediation (EISB)
. (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/8627
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):
Bryck, Sean. “Numerical Modeling of Thermal Enhancement of In Situ Chemical Oxidation (ISCO) and Enhanced In Situ Bioremediation (EISB)
.” 2014. Thesis, Queens University. Accessed January 22, 2021.
http://hdl.handle.net/1974/8627.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Bryck, Sean. “Numerical Modeling of Thermal Enhancement of In Situ Chemical Oxidation (ISCO) and Enhanced In Situ Bioremediation (EISB)
.” 2014. Web. 22 Jan 2021.
Vancouver:
Bryck S. Numerical Modeling of Thermal Enhancement of In Situ Chemical Oxidation (ISCO) and Enhanced In Situ Bioremediation (EISB)
. [Internet] [Thesis]. Queens University; 2014. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/1974/8627.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Bryck S. Numerical Modeling of Thermal Enhancement of In Situ Chemical Oxidation (ISCO) and Enhanced In Situ Bioremediation (EISB)
. [Thesis]. Queens University; 2014. Available from: http://hdl.handle.net/1974/8627
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Louisiana State University
27.
Scherr, Thomas Foster.
Numerical Investigation of Cryopreserved Zebrafish Sperm Cell Activation in Microchannels.
Degree: PhD, Chemical Engineering, 2014, Louisiana State University
URL: etd-04042014-211939
;
https://digitalcommons.lsu.edu/gradschool_dissertations/1782
► This aim of this research project is to probe the activation process of zebrafish spermatozoa. Zebrafish are a model species for biological engineering applications, and…
(more)
▼ This aim of this research project is to probe the activation process of zebrafish spermatozoa. Zebrafish are a model species for biological engineering applications, and the cryopreservation of their reproductive cells allows for inexpensive cataloging and maintenance of valuable biological material. Evaluation of cryopreservation protocols for aquatic sperm cells is typically accomplished by motility analysis after subjecting cells to a cryopreservation treatment. In zebrafish sperm cells, motility is initiated when cells come into contact with a hypo-osmotic environment. Subsequent activation analysis is currently done manually and brings with it an inherent difficulty and error. This process is slow and not ideal for high-throughput sample processing and analysis. As such, there is a critical need for an influx of enabling technologies to improve the throughput and optimization of these procedures. Microfluidics offers an intriguing solution to this problem. These devices, the size of a single 1-inch by 3-inch glass slide, offer automated, high-throughput, highly reproducible results. Additionally they utilize small sample volumes, which is important in minimizing valuable sample loss. Cells can be input into a micromixer which can rapidly dilute the extracellular environment, and then sent to an analysis chamber that acn determine the efficacy of a cryopreservation treatment. Despite its popularity in other fields, computational modeling of sperm cell activation has been nearly non-existent in literature. In this work, we model both the macroscopic aspects of particulate flow in a microchannel, and the microscopic mass transport across the cellular membrane. By tracking cells as they move throughout a simulated microdevice, we can find a history for each particle and predict cell outcomes. We are the first to introduce this combinatory model to the problem of cryoprotectant loading, where numerical modeling has well-established presence, and to the problem of zebrafish sperm cell activation. I envision the combination of microfluidics, with their controllable and reproducible flow patterns, and computational methods capturing both macro- and micro-transport, as two examples of the very enabling technologies that cryopreservation needs. While we apply these methods primarily to sperm cell analysis, the framework can be widely applied to a variety of cells and tissues.
Subjects/Keywords: numerical modeling; simulation; microfluidics; cryopreservation; transport phenomenon
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Manager
APA (6th Edition):
Scherr, T. F. (2014). Numerical Investigation of Cryopreserved Zebrafish Sperm Cell Activation in Microchannels. (Doctoral Dissertation). Louisiana State University. Retrieved from etd-04042014-211939 ; https://digitalcommons.lsu.edu/gradschool_dissertations/1782
Chicago Manual of Style (16th Edition):
Scherr, Thomas Foster. “Numerical Investigation of Cryopreserved Zebrafish Sperm Cell Activation in Microchannels.” 2014. Doctoral Dissertation, Louisiana State University. Accessed January 22, 2021.
etd-04042014-211939 ; https://digitalcommons.lsu.edu/gradschool_dissertations/1782.
MLA Handbook (7th Edition):
Scherr, Thomas Foster. “Numerical Investigation of Cryopreserved Zebrafish Sperm Cell Activation in Microchannels.” 2014. Web. 22 Jan 2021.
Vancouver:
Scherr TF. Numerical Investigation of Cryopreserved Zebrafish Sperm Cell Activation in Microchannels. [Internet] [Doctoral dissertation]. Louisiana State University; 2014. [cited 2021 Jan 22].
Available from: etd-04042014-211939 ; https://digitalcommons.lsu.edu/gradschool_dissertations/1782.
Council of Science Editors:
Scherr TF. Numerical Investigation of Cryopreserved Zebrafish Sperm Cell Activation in Microchannels. [Doctoral Dissertation]. Louisiana State University; 2014. Available from: etd-04042014-211939 ; https://digitalcommons.lsu.edu/gradschool_dissertations/1782
Louisiana State University
28.
Muley, Pranjali D.
Experimental and numerical investigation of pilot scale microwave assisted transesterification process for biodiesel production.
Degree: MSBAE, Engineering, 2011, Louisiana State University
URL: etd-02082012-092827
;
https://digitalcommons.lsu.edu/gradschool_theses/585
► The goal of this study was to design and test a pilot scale process for biodiesel production using advanced microwave technology and develop a numerical…
(more)
▼ The goal of this study was to design and test a pilot scale process for biodiesel production using advanced microwave technology and develop a numerical model for investigating various parameters affecting this process. Dielectric properties of materials play a major role in microwave design of a process. The dielectric properties (dielectric constant ε’ and dielectric loss ε”) of biodiesel precursors: soybean oil, alcohols and catalyst and their different mixtures were measured at four different temperatures (30°C, 45°C, 60°C and 75°C) and in the frequency range of 154 MHz to 4.5 GHz. Results indicate that the microwave dielectric properties of almost all components depend on both temperature and frequency. Addition of catalyst changed the properties of solvent due to the strong ionic nature. A scaled up version of a continuous microwave transesterification process was designed, built and tested. Experimental parameters were set based on previous laboratory scale results. Experiments were performed in a well controlled continuous pilot scale microwave reactor at temperatures of 60°C and 75°C and processing times of 5 to 15 minutes. Microwave power required to achieve the temperature of 60°C was 4000W and for 75°C was 4700W. Ethanol was used as a solvent with NaOH as a catalyst (< 0.2% by weight of oil). The conversion obtained was >99% for all experimental conditions. The final objective was to develop a basic numerical model of continuous electromagnetic heating of biodiesel precursors. A finite element model was built using COMSOL Multiphysics 4.2 software. High frequency electromagnetic problem was coupled with the non-isothermal flow problem. The model was tested for the two different power levels. The electric field, electromagnetic power flow and temperature profiles were studied. Resulting temperature profiles were verified by comparing to the experimental data. The presented study assists in understanding microwave heating application for biodiesel production. The dielectric property analysis gives a clear picture of interaction of biodiesel components with microwave irradiation, numerical model aids in understanding temperature distribution while experiments validate the results. This study can be applied to optimize the microwave assisted continuous biodiesel production process.
Subjects/Keywords: Numerical Modeling; Biodiesel; Dielectric Properties; Microwave Processing
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APA (6th Edition):
Muley, P. D. (2011). Experimental and numerical investigation of pilot scale microwave assisted transesterification process for biodiesel production. (Masters Thesis). Louisiana State University. Retrieved from etd-02082012-092827 ; https://digitalcommons.lsu.edu/gradschool_theses/585
Chicago Manual of Style (16th Edition):
Muley, Pranjali D. “Experimental and numerical investigation of pilot scale microwave assisted transesterification process for biodiesel production.” 2011. Masters Thesis, Louisiana State University. Accessed January 22, 2021.
etd-02082012-092827 ; https://digitalcommons.lsu.edu/gradschool_theses/585.
MLA Handbook (7th Edition):
Muley, Pranjali D. “Experimental and numerical investigation of pilot scale microwave assisted transesterification process for biodiesel production.” 2011. Web. 22 Jan 2021.
Vancouver:
Muley PD. Experimental and numerical investigation of pilot scale microwave assisted transesterification process for biodiesel production. [Internet] [Masters thesis]. Louisiana State University; 2011. [cited 2021 Jan 22].
Available from: etd-02082012-092827 ; https://digitalcommons.lsu.edu/gradschool_theses/585.
Council of Science Editors:
Muley PD. Experimental and numerical investigation of pilot scale microwave assisted transesterification process for biodiesel production. [Masters Thesis]. Louisiana State University; 2011. Available from: etd-02082012-092827 ; https://digitalcommons.lsu.edu/gradschool_theses/585
Louisiana State University
29.
Padilla, Joshua.
Glyphosate in Soils: Retention, Transport, and Effect of Phosphate.
Degree: MS, Hydrology, 2018, Louisiana State University
URL: https://digitalcommons.lsu.edu/gradschool_theses/4745
► Glyphosate [N-(phosphonomethyl) glycine)] (GPS) is currently the most commonly used herbicide worldwide, and is generally considered as immobile in soils. However, numerous reports of…
(more)
▼ Glyphosate [N-(phosphonomethyl) glycine)] (GPS) is currently the most commonly used herbicide worldwide, and is generally considered as immobile in soils. However, numerous reports of the environmental occurrence of the herbicide coupled with recent evidence of human toxicity require further investigation as to the behavior of GPS in the soil environment. The objectives of this study were to quantify GPS sorption and mobility in two Louisiana agricultural soils with varying physiochemical properties; Commerce silt loam and Sharkey clay. Results of batch sorption studies indicated a high affinity of both soils for solvated GPS, with 24-hour Freundlich partitioning coefficients of 158 and 396 L kg-1 for the Commerce and Sharkey soils, respectively. Sorption by the Commerce soil was likely facilitated by the relatively high amounts of amorphous Fe and Al oxides, whereas the high cation exchange capacity of the Sharkey soil likely allowed for complexation with surface exchangeable polyvalent cations. A two-site multi-reaction model incorporating time-dependent reversible and irreversible reactions provided an adequate description of the measured data.
The results of miscible displacement studies indicated that the mobility of GPS is highly limited in both soils, with only 2-3% of the applied herbicide mass recovered in the effluent solution. Similar to the batch study, a two-site multi-reaction transport model (MRTM) consisting of kinetic reversible and irreversible reactions provided a good description of the breakthrough data from both soils, and outperformed linear modeling approaches using CXTFIT.
Competitive batch experiments, where sorption of both GPS and phosphate was considered, suggested that competition between the two solutes for reactive sites in both soils is significant, with phosphate being preferentially sorbed. GPS mobility in the Commerce soil remained highly limited when applied in conjunction with and succeeding phosphate pulses. However, a phosphate pulse introduced to the column following a GPS pulse resulted in an additional 4% of the applied mass of the herbicide being recovered in a secondary breakthrough. These findings are significant, as they emphasize the importance of the timing of herbicide and fertilizer applications on the behavior and ultimate fate of GPS in soils.
Subjects/Keywords: Glyphosate; Retention; Solute Transport; Numerical Modeling
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Record Details
Similar Records
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APA ·
Chicago ·
MLA ·
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CSE |
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Manager
APA (6th Edition):
Padilla, J. (2018). Glyphosate in Soils: Retention, Transport, and Effect of Phosphate. (Masters Thesis). Louisiana State University. Retrieved from https://digitalcommons.lsu.edu/gradschool_theses/4745
Chicago Manual of Style (16th Edition):
Padilla, Joshua. “Glyphosate in Soils: Retention, Transport, and Effect of Phosphate.” 2018. Masters Thesis, Louisiana State University. Accessed January 22, 2021.
https://digitalcommons.lsu.edu/gradschool_theses/4745.
MLA Handbook (7th Edition):
Padilla, Joshua. “Glyphosate in Soils: Retention, Transport, and Effect of Phosphate.” 2018. Web. 22 Jan 2021.
Vancouver:
Padilla J. Glyphosate in Soils: Retention, Transport, and Effect of Phosphate. [Internet] [Masters thesis]. Louisiana State University; 2018. [cited 2021 Jan 22].
Available from: https://digitalcommons.lsu.edu/gradschool_theses/4745.
Council of Science Editors:
Padilla J. Glyphosate in Soils: Retention, Transport, and Effect of Phosphate. [Masters Thesis]. Louisiana State University; 2018. Available from: https://digitalcommons.lsu.edu/gradschool_theses/4745
Virginia Tech
30.
Wiersma, Codi Allen.
The Automation of Numerical Models of Coseismic Tsunamis.
Degree: MS, Geosciences, 2019, Virginia Tech
URL: http://hdl.handle.net/10919/93273
► Short term modeling of tsunamis generated by earthquakes is poorly explored. If an earthquake causes movement in a fault located underwater, and this movement will…
(more)
▼ Short term
modeling of tsunamis generated by earthquakes is poorly explored. If an earthquake causes movement in a fault located underwater, and this movement will then cause the water column above it to be displaced. Tsunami models are sensitive to how the fault moves, and an accurate representation of this movement often takes much more time that the duration of a tsunami. This lengthy process is ineffective for short term
modeling. This study instead estimates several possible scenarios of how the fault will behave, and model each of them. This will show how different locations of interest are sensitive to different geometries of fault failure. Initial results show that by varying this geometry, the tsunami wave behaves very differently, and will cause different amounts of run-up in the same location depending on which particular geometry is modeled. The automation of distinctly different earthquake sources serve as a good starting point for future work to be conducted to generate more accurate models.
Advisors/Committee Members: Weiss, Robert (committeechair), Warburton, Timothy (committee member), Stamps, D. Sarah (committee member), Chapman, Martin C. (committee member).
Subjects/Keywords: Numerical Modeling; Tsunami; GeoClaw; Finite Volume
Record Details
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Record Details
Similar Records
Cite
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APA ·
Chicago ·
MLA ·
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Manager
APA (6th Edition):
Wiersma, C. A. (2019). The Automation of Numerical Models of Coseismic Tsunamis. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/93273
Chicago Manual of Style (16th Edition):
Wiersma, Codi Allen. “The Automation of Numerical Models of Coseismic Tsunamis.” 2019. Masters Thesis, Virginia Tech. Accessed January 22, 2021.
http://hdl.handle.net/10919/93273.
MLA Handbook (7th Edition):
Wiersma, Codi Allen. “The Automation of Numerical Models of Coseismic Tsunamis.” 2019. Web. 22 Jan 2021.
Vancouver:
Wiersma CA. The Automation of Numerical Models of Coseismic Tsunamis. [Internet] [Masters thesis]. Virginia Tech; 2019. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10919/93273.
Council of Science Editors:
Wiersma CA. The Automation of Numerical Models of Coseismic Tsunamis. [Masters Thesis]. Virginia Tech; 2019. Available from: http://hdl.handle.net/10919/93273
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