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Wesleyan University
1.
Parsa Moghaddam, Shima.
Rotational Dynamics of Rod Particles in Fluid Flows.
Degree: Physics, 2013, Wesleyan University
URL: https://wesscholar.wesleyan.edu/etd_diss/16 
► The primary aim of this research is to study the dynamics of rods in fluid flows, quantify the alignment of rods with the flow…
(more)
▼ The primary aim of this research is to study the dynamics of rods in fluid flows, quantify the alignment of rods with the flow and the effects of alignment on the rotation rates. We perform experimental measurements of the rotation of rods in three-dimensional
turbulence and resolve the rotational properties.
In a 2D chaotic flow we measured the translational and rotational dynamics of rods along with the velocity of the carrier flow. Rods are strongly aligned with the stretching direction of the Cauchy-Green deformation tensor.
We report the first three-dimensional measurements of the rotational dynamics of rod-like particles as they are advected in a turbulent fluid flow. Tracer rods preferentially sample the flow since their orientations become correlated with the velocity gradient tensor. The probability distribution of the mean square rotation rate has a long tail which implies the presence of rare events with large rotation rates. Rotation of particles is controlled by small scales of
turbulence that are nearly universal, these measurements provide a rich system where experiments can be directly compared with theory and simulations.
In another set of experiments we measured the rotational statistics of neutrally buoyant rods with lengths 2.8 < l/η < 72.9, where η is the Kolmogorov length scale, in
turbulence and quantify how their rotation rate depends on length. The mean square rotation rate of rods decreases as the length of the rods increases and for lengths in the inertial range. We derive an scaling of l
-4/3 for the mean square rotation rate and show that experimental measurements approach this scaling law. In comparison with the randomly oriented rods we see that all rod lengths develop alignment with the velocity gradient of the flow at the length of the rods. We have also measured the correlation time of the Lagrangian autocorrelation of rod rotation rate and find that the correlation time scales as the turn over time of eddies of the size of the rod. Measuring the rotational dynamics of single long rods provides a new way to access the spatial structure of the flow at different length scales.
Advisors/Committee Members: Greg A. Voth.
Subjects/Keywords: Turbulence
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APA (6th Edition):
Parsa Moghaddam, S. (2013). Rotational Dynamics of Rod Particles in Fluid Flows. (Doctoral Dissertation). Wesleyan University. Retrieved from https://wesscholar.wesleyan.edu/etd_diss/16
Chicago Manual of Style (16th Edition):
Parsa Moghaddam, Shima. “Rotational Dynamics of Rod Particles in Fluid Flows.” 2013. Doctoral Dissertation, Wesleyan University. Accessed February 27, 2021.
https://wesscholar.wesleyan.edu/etd_diss/16.
MLA Handbook (7th Edition):
Parsa Moghaddam, Shima. “Rotational Dynamics of Rod Particles in Fluid Flows.” 2013. Web. 27 Feb 2021.
Vancouver:
Parsa Moghaddam S. Rotational Dynamics of Rod Particles in Fluid Flows. [Internet] [Doctoral dissertation]. Wesleyan University; 2013. [cited 2021 Feb 27].
Available from: https://wesscholar.wesleyan.edu/etd_diss/16.
Council of Science Editors:
Parsa Moghaddam S. Rotational Dynamics of Rod Particles in Fluid Flows. [Doctoral Dissertation]. Wesleyan University; 2013. Available from: https://wesscholar.wesleyan.edu/etd_diss/16
Oregon State University
2.
Duncombe, Jenessa R.
Linear Theory of Roll Instabilities in the Ocean Surface Layer.
Degree: MS, 2017, Oregon State University
URL: http://hdl.handle.net/1957/61386
► This thesis describes the results of a linear stability analysis conducted on a simulated wind-forced ocean front. The ocean surface boundary layer regulates exchanges between…
(more)
▼ This thesis describes the results of a linear stability analysis conducted on a simulated wind-forced ocean front. The ocean surface boundary layer regulates exchanges between the ocean and atmosphere, and the presence of
turbulence in the surface layer can greatly impact climate and ocean life. Past research has shown that the combination of horizontal density gradients and wind stress can trigger turbulent roll instabilities in the boundary layer, but the underlying instability mechanisms are not well understood. In this thesis I assess the dominant instability mechanisms of roll instabilities from several Large Eddy Simulation (LES) numerical model solutions. I relate the numerical solutions to a simplified analytical model to draw conclusions about the underlying instability mechanisms. The results show that roll instabilities in the LES solutions convert energy from both ageostrophic and geostrophic shear of the mean flow. Both symmetric instability and Ekman inflection point instability contribute to roll growth, and in some cases, the combination of symmetric instability and Ekman instability form a mixed-mode instability with roll axis oriented obliquely to the front, consistent with the LES solutions. I conclude that wind-forced frontal zones are unstable to baroclinic, symmetric, and Ekman inflection point instabilities depending on the strength of the wind stress and the frontal temperature gradient. Future studies of wind-forced fronts should recognize the impact of Ekman inflection point instability on boundary layer energy dissipation and mixing, and emphasize its importance even in the presence of symmetrically unstable flow conditions.
Advisors/Committee Members: Skllingstad, Eric D. (advisor), Smyth, Bill D. (committee member).
Subjects/Keywords: Turbulence
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APA (6th Edition):
Duncombe, J. R. (2017). Linear Theory of Roll Instabilities in the Ocean Surface Layer. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/61386
Chicago Manual of Style (16th Edition):
Duncombe, Jenessa R. “Linear Theory of Roll Instabilities in the Ocean Surface Layer.” 2017. Masters Thesis, Oregon State University. Accessed February 27, 2021.
http://hdl.handle.net/1957/61386.
MLA Handbook (7th Edition):
Duncombe, Jenessa R. “Linear Theory of Roll Instabilities in the Ocean Surface Layer.” 2017. Web. 27 Feb 2021.
Vancouver:
Duncombe JR. Linear Theory of Roll Instabilities in the Ocean Surface Layer. [Internet] [Masters thesis]. Oregon State University; 2017. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1957/61386.
Council of Science Editors:
Duncombe JR. Linear Theory of Roll Instabilities in the Ocean Surface Layer. [Masters Thesis]. Oregon State University; 2017. Available from: http://hdl.handle.net/1957/61386
3.
Eremin, Aleksandr.
Numerical implementation of the wave-turbulence closure in a rotating channel : Implémentation numérique de la fermeture de turbulence d’ondes dans un canal rotatif.
Degree: Docteur es, Mécanique des fluides, 2019, Lyon
URL: http://www.theses.fr/2019LYSEC031
► L’étude porte sur un problème de turbulence dans un canal mis en rotation rapide. Dans ce cas, la non linéarité est dominée par la rotation,…
(more)
▼ L’étude porte sur un problème de
turbulence dans un canal mis en rotation rapide. Dans ce cas, la non linéarité est dominée par la rotation, ce qui suggère d’utiliser la théorie de la
turbulence d’ondes.La première partie de ce travail porte sur l’étude du modèle de fermeture pour la
turbulence d’ondes (WTC pour « wave-
turbulence closure »). Nous exprimons le champ de vitesse comme combinaison de modes de guide d’onde inertiels. Le confinement en canal implique aussi une discrétisation de la composante du vecteur d’onde normale à la paroi. Le transfert non linéaire est dominé par les interactions résonantes entre triades de vecteurs d’ondes. La viscosité, qui se manifeste par l’amortissement des modes, est la somme de deux contributions : l’une volumique, l’autre due à la paroi. Le taux d’amortissement en volume croît comme le carré du nombre d’onde, et inhibe la cascade d’énergie en-deçà d’une certaine échelle de longueur.L’implémentation numérique du modèle utilise un schéma d’avancement en temps qui assure la propriété de réalisabilité du modèle ainsi que la prise en compte des discontinuités spectrales prédites par la théorie de
turbulence d’ondes. Les résultats de notre étude numérique du modèle WTC montrent que l’évolution en temps de la
turbulence se produit en deux phases. Pendant la première phase, l’amortissement dû à la paroi est dominant, mais à la suite de la cascade d’énergie vers les petites échelles, l’amortissement volumique prend le dessus pendant la seconde phase. Lorsque le coefficient d’amortissement volumique est suffisamment petit, la transition entre les deux phases se produit brusquement à un instant qui est indépendant à la fois des coefficients d’amortissement volumique et de paroi, mais qui varie significativement avec le troisième paramètre du problème qu’est la largeur spectrale initiale. L’évolution du spectre révèle le développement d’une zone inertielle dont la pente se trouve presque indépendante des paramètres du problème. Le transfert d’énergie parallèlement aux parois du canal apparaît être plus efficace que dans la direction normale.En vue de réaliser des simulations numériques directes (DNS pour « Direct Numerical Simulations »), il a fallu développer une méthode appropriée à l’initialisation d’un champ de vitesse possédant les propriétés statistiques prescrites par le modèle. La comparaison des résultats de DNS et de WTC nécessite la construction de la matrice spectrale aux temps ultérieurs. Ceci a nécessité le développement de méthodes d’analyse spectrale et leur incorporation au sein du code de DNS existant. Malgré l’utilisation d’un super-calculateur et du calcul massivement parallèle, seuls trois calculs de DNS ont été possibles. Ces calculs utilisent les mêmes paramètres physiques mais différentes périodes spatiales pour la DNS, afin de vérifier la convergence en fonction des paramètres numériques. Idéalement, de nombreuses réalisations devraient être lancées et une moyenne d’ensemble prise pour calculer la matrice spectrale. Ceci n’étant pas possible avec un seul calcul,…
Advisors/Committee Members: Scott, Julian (thesis director).
Subjects/Keywords: Turbulence en rotation; Turbulence d’ondes; Turbulence confinée; Rotating turbulence; Wave turbulence; Confined turbulence
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APA (6th Edition):
Eremin, A. (2019). Numerical implementation of the wave-turbulence closure in a rotating channel : Implémentation numérique de la fermeture de turbulence d’ondes dans un canal rotatif. (Doctoral Dissertation). Lyon. Retrieved from http://www.theses.fr/2019LYSEC031
Chicago Manual of Style (16th Edition):
Eremin, Aleksandr. “Numerical implementation of the wave-turbulence closure in a rotating channel : Implémentation numérique de la fermeture de turbulence d’ondes dans un canal rotatif.” 2019. Doctoral Dissertation, Lyon. Accessed February 27, 2021.
http://www.theses.fr/2019LYSEC031.
MLA Handbook (7th Edition):
Eremin, Aleksandr. “Numerical implementation of the wave-turbulence closure in a rotating channel : Implémentation numérique de la fermeture de turbulence d’ondes dans un canal rotatif.” 2019. Web. 27 Feb 2021.
Vancouver:
Eremin A. Numerical implementation of the wave-turbulence closure in a rotating channel : Implémentation numérique de la fermeture de turbulence d’ondes dans un canal rotatif. [Internet] [Doctoral dissertation]. Lyon; 2019. [cited 2021 Feb 27].
Available from: http://www.theses.fr/2019LYSEC031.
Council of Science Editors:
Eremin A. Numerical implementation of the wave-turbulence closure in a rotating channel : Implémentation numérique de la fermeture de turbulence d’ondes dans un canal rotatif. [Doctoral Dissertation]. Lyon; 2019. Available from: http://www.theses.fr/2019LYSEC031
Delft University of Technology
4.
Gawandalkar, Udhav (author).
The effect of mildly rapid strain on turbulent pipe flow.
Degree: 2019, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:b5643448-3a33-46b1-8570-6015642eb492
► The way in which mean strain affects the turbulent structures is imperative to understand various natural flows such as flow over a hill, the flow…
(more)
▼ The way in which mean strain affects the turbulent structures is imperative to understand various natural flows such as flow over a hill, the flow of a river in the delta, jet streams in the upper atmosphere etc. Further, it also has industrial implications viz; flow over bodies such as airfoil, turbomachinery, gas pipelines. The strained pipe flows, in particular, have huge engineering interest due to its prevalence in industrial fittings wherein a larger pipe diameter is connected to a smaller one and vice versa. This subject also has a fundamental interest as strain highlights the interaction of various scales of turbulence. This scale interaction essentially dictates transfer of energy in turbulence and hence is fundamental in understanding turbulence dynamics itself. The present work deals with the experimental study of the response of pipe turbulence to axisymmetric, irrotational strain using high-resolution planar Particle Image Velocimetry (PIV). A mildly rapid strain (<i>s*s</i> ~ 3.2) is imposed on turbulence via a spatial contraction. It is seen that turbulence is suppressed upon straining. As a response to mean strain, transverse Reynold stress increases at the expense of streamwise Reynolds stress and anisotropy is induced in the turbulence. Despite strain being only mildly rapid, Rapid Distortion Theory (RDT) is found to predict the correct trend of normal Reynolds stress although traverse Reynolds stress is over-predicted. The effect of strain on different scales of turbulence is discerned. The large scales of turbulence are seen to get compressed in the radial direction although they do not get affected significantly in the streamwise direction. Near-wall coherent structures which were initially inclined w.r.t. the wall are seen to get aligned with the flow as they also get severely compressed in the radial direction. On the other hand, the small scales of turbulence are found to be spatially organised in the form of sheets or layers. Upon straining, these sheets are found to get aligned with the mean flow. Further, they get elongated in streamwise and compressed in the radial direction. It is observed that the small scales are more severely distorted than the large scales upon staining inside the contraction. At the Reynolds number (<i>Re</i>) range employed in this thesis, there is no substantial difference in which turbulence is strained inside the contraction at disparate Re. Downstream of the contraction, at the axis of the pipe, the anisotropy of Reynolds stress is found to recover slowly. Further, this relaxation is seen to be Re dependent with higher<i> Re</i> turbulence relaxing slightly faster.
Mechanical Engineering | Process and Energy Technology
Advisors/Committee Members: Westerweel, Jerry (mentor), Elsinga, Gerrit (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: pipe turbulence; strained turbulence; PIV
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APA (6th Edition):
Gawandalkar, U. (. (2019). The effect of mildly rapid strain on turbulent pipe flow. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:b5643448-3a33-46b1-8570-6015642eb492
Chicago Manual of Style (16th Edition):
Gawandalkar, Udhav (author). “The effect of mildly rapid strain on turbulent pipe flow.” 2019. Masters Thesis, Delft University of Technology. Accessed February 27, 2021.
http://resolver.tudelft.nl/uuid:b5643448-3a33-46b1-8570-6015642eb492.
MLA Handbook (7th Edition):
Gawandalkar, Udhav (author). “The effect of mildly rapid strain on turbulent pipe flow.” 2019. Web. 27 Feb 2021.
Vancouver:
Gawandalkar U(. The effect of mildly rapid strain on turbulent pipe flow. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Feb 27].
Available from: http://resolver.tudelft.nl/uuid:b5643448-3a33-46b1-8570-6015642eb492.
Council of Science Editors:
Gawandalkar U(. The effect of mildly rapid strain on turbulent pipe flow. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:b5643448-3a33-46b1-8570-6015642eb492
5.
Ouali, Sofiane.
Etude et simulation numérique de la combustion turbulente des flammes prémélangées suspendues de méthane-air pour des bruleurs à faible nombre de swirl.
Degree: 2015, Université M'Hamed Bougara Boumerdès
URL: http://dlibrary.univ-boumerdes.dz:8080/jspui/handle/123456789/982
► 126 p. : ill. ; 30 cm
Cette thèse s'inscrit dans le cadre de recherches portées sur la simulation numérique des flammes prémélangées turbulentes suspendues…
(more)
▼ 126 p. : ill. ; 30 cm
Cette thèse s'inscrit dans le cadre de recherches portées sur la simulation numérique des flammes prémélangées turbulentes suspendues de méthane-air stabilisées par swirl pour des brûleurs de configuration LSB (Low Swirl Burner). Le bec du brûleur a un rayon de 25 mm et se compose de deux parties distinctes ; la plaque perforée axiale d'un rayon de 15 mm où l'écoulement du pré-mélange réactif est purement axiale et de l'espace annulaire swirlé (10 mm) où l'écoulement du mélange réactif est swirlé tout en ayant deux composantes de vitesses ; axiale et tangentielle. L'étude s'est portée essentiellement sur l'effet de la richesse du méthane (CH4) À de 0.6 à 1.4 avec un pas de 0.2 et de l'effet du nombre de swirl S de 0.5 à 1.0 avec un pas de 0.1. La simulation numérique a été effectuée pour deux configurations ; 2D et 3D où l'effet de la richesse a été étudié pour les deux. Tandis que l'effet du nombre de swirl a été étudié uniquement en configuration 3D. Plusieurs paramètres considérés comme étant régisseurs des structures de flammes sont analysés et comparés aux résultats expérimentaux disponibles dans la littérature, à savoir; les champs de vitesse, température, la distribution du méthane (CH4) et la formation des polluants (NOx et CO). La turbulence a été prise en considération en utilisant le modèle RANS (Reynolds Average Navier-Stokes) k-À STANDARD. Tandis que la combustion a été étudié en utilisant deux modèles ; EDM (Eddy Dissipation Model) et Partially-Premixed. De par la validation des résultats obtenus, le modèle Partially-Premixed a été retenue pour l'analyse de l'effet de la richesse et de l'intensité du swirl. La comparaison des résultats obtenus par la simulation numérique avec ceux qui sont disponibles dans la littérature a montré un accord satisfaisant pour tous les paramètres de flammes étudiées. L'intérêt particulier de cette étude est de trouver un compromis entre le maximum de température qui puisse être atteint et la limite du nombre de swirl et de la richesse qui puissent être imposés avec le minimum d'émissions de NOx et de CO tout en assurant le maintien de la stabilité et la localisation de la flamme. En outre, les caractéristiques spécifiques des brûleurs à faible nombre de swirl LSB ont été retrouvée
Subjects/Keywords: Turbulence; Méthane
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APA (6th Edition):
Ouali, S. (2015). Etude et simulation numérique de la combustion turbulente des flammes prémélangées suspendues de méthane-air pour des bruleurs à faible nombre de swirl. (Thesis). Université M'Hamed Bougara Boumerdès. Retrieved from http://dlibrary.univ-boumerdes.dz:8080/jspui/handle/123456789/982
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):
Ouali, Sofiane. “Etude et simulation numérique de la combustion turbulente des flammes prémélangées suspendues de méthane-air pour des bruleurs à faible nombre de swirl.” 2015. Thesis, Université M'Hamed Bougara Boumerdès. Accessed February 27, 2021.
http://dlibrary.univ-boumerdes.dz:8080/jspui/handle/123456789/982.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ouali, Sofiane. “Etude et simulation numérique de la combustion turbulente des flammes prémélangées suspendues de méthane-air pour des bruleurs à faible nombre de swirl.” 2015. Web. 27 Feb 2021.
Vancouver:
Ouali S. Etude et simulation numérique de la combustion turbulente des flammes prémélangées suspendues de méthane-air pour des bruleurs à faible nombre de swirl. [Internet] [Thesis]. Université M'Hamed Bougara Boumerdès; 2015. [cited 2021 Feb 27].
Available from: http://dlibrary.univ-boumerdes.dz:8080/jspui/handle/123456789/982.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ouali S. Etude et simulation numérique de la combustion turbulente des flammes prémélangées suspendues de méthane-air pour des bruleurs à faible nombre de swirl. [Thesis]. Université M'Hamed Bougara Boumerdès; 2015. Available from: http://dlibrary.univ-boumerdes.dz:8080/jspui/handle/123456789/982
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Alberta
6.
Munroe, James Ross.
Internal wave generation by intrusions, topography, and
turbulence.
Degree: PhD, Department of Physics, 2009, University of Alberta
URL: https://era.library.ualberta.ca/files/7w62f8811
► Internal gravity waves transport energy and momentum in both the atmosphere and the ocean. This physical process occurs at such small length scales that it…
(more)
▼ Internal gravity waves transport energy and momentum
in both the atmosphere and the ocean. This physical process occurs
at such small length scales that it is not captured by coarse
resolution numerical models of weather and climate. A series of
experiments is presented that model the generation of
non-hydrostatic internal gravity waves by intrusions and by the
forcing of wind driven turbulent eddies in the surface mixed layer
of the ocean. In a first set of experiments, gravity currents
intrude into a uniformly stratified ambient fluid and the internal
waves that are launched are examined with a finite-volume,
full-depth, lock-release setup. In a second set of experiments,
isolated rough topography is towed through stratified fluid and the
interaction between the turbulent wake and internal waves is
investigated. In a third set of experiments, a turbulent shear
layer is forced by a conveyor belt affixed with flat plates near
the surface of a stratified fluid and downward propagating internal
waves are generated. The turbulence in the shear layer is
characterized using particle image velocimetry to measure the
kinetic energy as well as length and time scales. The internal
waves are measured using synthetic schlieren to determine the
amplitudes, frequencies, and the energy of the generated waves.
Finally, numerical simulations are used to validate and extend the
results of laboratory experiments. The thesis will address the
question of what fraction of the turbulent kinetic energy of a
shear turbulent mixed layer is radiated away by internal waves.
Implications for internal waves propagating into the ocean are
discussed.
Subjects/Keywords: waves; turbulence
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APA (6th Edition):
Munroe, J. R. (2009). Internal wave generation by intrusions, topography, and
turbulence. (Doctoral Dissertation). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/7w62f8811
Chicago Manual of Style (16th Edition):
Munroe, James Ross. “Internal wave generation by intrusions, topography, and
turbulence.” 2009. Doctoral Dissertation, University of Alberta. Accessed February 27, 2021.
https://era.library.ualberta.ca/files/7w62f8811.
MLA Handbook (7th Edition):
Munroe, James Ross. “Internal wave generation by intrusions, topography, and
turbulence.” 2009. Web. 27 Feb 2021.
Vancouver:
Munroe JR. Internal wave generation by intrusions, topography, and
turbulence. [Internet] [Doctoral dissertation]. University of Alberta; 2009. [cited 2021 Feb 27].
Available from: https://era.library.ualberta.ca/files/7w62f8811.
Council of Science Editors:
Munroe JR. Internal wave generation by intrusions, topography, and
turbulence. [Doctoral Dissertation]. University of Alberta; 2009. Available from: https://era.library.ualberta.ca/files/7w62f8811
Oregon State University
7.
Schnautz, John Adelbert.
Effect of turbulence intensity on mass transfer from plates, cylinders, and spheres in air streams.
Degree: PhD, Chemical Engineering, 1957, Oregon State University
URL: http://hdl.handle.net/1957/51008
Subjects/Keywords: Turbulence
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APA ·
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MLA ·
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Manager
APA (6th Edition):
Schnautz, J. A. (1957). Effect of turbulence intensity on mass transfer from plates, cylinders, and spheres in air streams. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/51008
Chicago Manual of Style (16th Edition):
Schnautz, John Adelbert. “Effect of turbulence intensity on mass transfer from plates, cylinders, and spheres in air streams.” 1957. Doctoral Dissertation, Oregon State University. Accessed February 27, 2021.
http://hdl.handle.net/1957/51008.
MLA Handbook (7th Edition):
Schnautz, John Adelbert. “Effect of turbulence intensity on mass transfer from plates, cylinders, and spheres in air streams.” 1957. Web. 27 Feb 2021.
Vancouver:
Schnautz JA. Effect of turbulence intensity on mass transfer from plates, cylinders, and spheres in air streams. [Internet] [Doctoral dissertation]. Oregon State University; 1957. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1957/51008.
Council of Science Editors:
Schnautz JA. Effect of turbulence intensity on mass transfer from plates, cylinders, and spheres in air streams. [Doctoral Dissertation]. Oregon State University; 1957. Available from: http://hdl.handle.net/1957/51008
Oregon State University
8.
Newberger, Priscilla.
Turbulence in the bottom boundary layer.
Degree: PhD, Oceanography, 1980, Oregon State University
URL: http://hdl.handle.net/1957/27948
Subjects/Keywords: Turbulence
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APA (6th Edition):
Newberger, P. (1980). Turbulence in the bottom boundary layer. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/27948
Chicago Manual of Style (16th Edition):
Newberger, Priscilla. “Turbulence in the bottom boundary layer.” 1980. Doctoral Dissertation, Oregon State University. Accessed February 27, 2021.
http://hdl.handle.net/1957/27948.
MLA Handbook (7th Edition):
Newberger, Priscilla. “Turbulence in the bottom boundary layer.” 1980. Web. 27 Feb 2021.
Vancouver:
Newberger P. Turbulence in the bottom boundary layer. [Internet] [Doctoral dissertation]. Oregon State University; 1980. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1957/27948.
Council of Science Editors:
Newberger P. Turbulence in the bottom boundary layer. [Doctoral Dissertation]. Oregon State University; 1980. Available from: http://hdl.handle.net/1957/27948
9.
Ouali, Sofiane.
Etude et simulation numérique de la combustion turbulente des flammes prémélangées suspendues de méthane-air pour des bruleurs à faible nombre de swirl.
Degree: 2015, Université M'Hamed Bougara Boumerdès
URL: http://dlibrary.univ-boumerdes.dz:8080/jspui/handle/123456789/2003
► 126 p. : ill. ; 30 cm
Cette thèse s'inscrit dans le cadre de recherches portées sur la simulation numérique des flammes prémélangées turbulentes suspendues…
(more)
▼ 126 p. : ill. ; 30 cm
Cette thèse s'inscrit dans le cadre de recherches portées sur la simulation numérique des flammes prémélangées turbulentes suspendues de méthane-air stabilisées par swirl pour des brûleurs de configuration LSB (Low Swirl Burner). Le bec du brûleur a un rayon de 25 mm et se compose de deux parties distinctes ; la plaque perforée axiale d'un rayon de 15 mm où l'écoulement du pré-mélange réactif est purement axiale et de l'espace annulaire swirlé (10 mm) où l'écoulement du mélange réactif est swirlé tout en ayant deux composantes de vitesses ; axiale et tangentielle. L'étude s'est portée essentiellement sur l'effet de la richesse du méthane (CH4) À de 0.6 à 1.4 avec un pas de 0.2 et de l'effet du nombre de swirl S de 0.5 à 1.0 avec un pas de 0.1. La simulation numérique a été effectuée pour deux configurations ; 2D et 3D où l'effet de la richesse a été étudié pour les deux. Tandis que l'effet du nombre de swirl a été étudié uniquement en configuration 3D. Plusieurs paramètres considérés comme étant régisseurs des structures de flammes sont analysés et comparés aux résultats expérimentaux disponibles dans la littérature, à savoir; les champs de vitesse, température, la distribution du méthane (CH4) et la formation des polluants (NOx et CO). La turbulence a été prise en considération en utilisant le modèle RANS (Reynolds Average Navier-Stokes) k-À STANDARD. Tandis que la combustion a été étudié en utilisant deux modèles ; EDM (Eddy Dissipation Model) et Partially-Premixed. De par la validation des résultats obtenus, le modèle Partially-Premixed a été retenue pour l'analyse de l'effet de la richesse et de l'intensité du swirl. La comparaison des résultats obtenus par la simulation numérique avec ceux qui sont disponibles dans la littérature a montré un accord satisfaisant pour tous les paramètres de flammes étudiées. L'intérêt particulier de cette étude est de trouver un compromis entre le maximum de température qui puisse être atteint et la limite du nombre de swirl et de la richesse qui puissent être imposés avec le minimum d'émissions de NOx et de CO tout en assurant le maintien de la stabilité et la localisation de la flamme. En outre, les caractéristiques spécifiques des brûleurs à faible nombre de swirl LSB ont été retrouvée
Subjects/Keywords: Turbulence; Méthane
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APA (6th Edition):
Ouali, S. (2015). Etude et simulation numérique de la combustion turbulente des flammes prémélangées suspendues de méthane-air pour des bruleurs à faible nombre de swirl. (Thesis). Université M'Hamed Bougara Boumerdès. Retrieved from http://dlibrary.univ-boumerdes.dz:8080/jspui/handle/123456789/2003
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):
Ouali, Sofiane. “Etude et simulation numérique de la combustion turbulente des flammes prémélangées suspendues de méthane-air pour des bruleurs à faible nombre de swirl.” 2015. Thesis, Université M'Hamed Bougara Boumerdès. Accessed February 27, 2021.
http://dlibrary.univ-boumerdes.dz:8080/jspui/handle/123456789/2003.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ouali, Sofiane. “Etude et simulation numérique de la combustion turbulente des flammes prémélangées suspendues de méthane-air pour des bruleurs à faible nombre de swirl.” 2015. Web. 27 Feb 2021.
Vancouver:
Ouali S. Etude et simulation numérique de la combustion turbulente des flammes prémélangées suspendues de méthane-air pour des bruleurs à faible nombre de swirl. [Internet] [Thesis]. Université M'Hamed Bougara Boumerdès; 2015. [cited 2021 Feb 27].
Available from: http://dlibrary.univ-boumerdes.dz:8080/jspui/handle/123456789/2003.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ouali S. Etude et simulation numérique de la combustion turbulente des flammes prémélangées suspendues de méthane-air pour des bruleurs à faible nombre de swirl. [Thesis]. Université M'Hamed Bougara Boumerdès; 2015. Available from: http://dlibrary.univ-boumerdes.dz:8080/jspui/handle/123456789/2003
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
10.
Tian, Jing.
Study of Nonlinear Analysis and Chaos in Vibrations and Fluids.
Degree: PhD, Mathematics, 2016, Texas A&M University
URL: http://hdl.handle.net/1969.1/157947
► Chaos and turbulence are two important topics in nonlinear dynamics. In this study, two problems related to chaos and turbulence modelling are presented. They are…
(more)
▼ Chaos and
turbulence are two important topics in nonlinear dynamics. In this study, two problems related to chaos and
turbulence modelling are presented. They are the chaotic vibration phenomenon in high-dimensional partial differential equations and the emergence of the Navier-Stokes-alpha model for channel flows.
The study of the chaotic vibration phenomenon in high-dimensional partial differential equations is explained from both the numerical and theoretical aspects. In the numerical perspective, we have studied the chaotic vibration phenomenon of the 2D wave equation through numerical simulations. Based on the finite-volume method, we have built our own solver “img2Foam" in the Computational Fluid Dynamics software OpenFOAM (Open source Field Operation and Manipulation). We have implemented several numerical simulations containing both chaotic and non-chaotic cases. As for the theoretical perspective, we give a rigorous proof for the chaotic vibration phenomenon of the 2D non-strictly hyperbolic equation. After introducing two linear operators, the initial system of the 2D non-strictly hyperbolic equation is converted into a system of two coupled first order equations. By using the method of characteristics, we have found the explicit solution formulas of the new system. We have also found a regime of the parameters when the chaotic vibration phenomenon occurs by applying the period-doubling bifurcation theorem. Numerical simulations are presented to validate the theoretical results.
Inspired by the concept of the regular part of the weak attractor of the 3D Navier- Stokes equations, we concentrate on a restricted class of fluid flows to explore the transition from the Navier-Stokes equations to the Navier-Stokes-alpha model for channel flows. The Navier-Stokes equations have been widely used to describe the motion of viscous incompressible fluid flows. As an averaged version of the Navier- Stokes equations, the Navier-Stokes-alpha model has solid mathematical properties as well as reliable experimental matches. Therefore, the Navier-Stokes-alpha model is taken as an approximation for the dynamics of appropriately averaged turbulent fluid flows. We are interested in finding a connection between Navier-Stokes equations and the Navier-Stokes-alpha model in terms of the physical properties of the fluid flow. Given the hypothesis that the
turbulence described by the Navier-Stokes-alpha model was partly due to the roughness of the walls, the transition from the Navier-Stokes equations into the Navier-Stokes-alpha model is presented by introducing a Reynolds type averaging.
Advisors/Committee Members: Chen, Goong (advisor), Chin, Siu A (committee member), Daripa, Prabir (committee member), Howard, Peter (committee member).
Subjects/Keywords: chaos; turbulence
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APA (6th Edition):
Tian, J. (2016). Study of Nonlinear Analysis and Chaos in Vibrations and Fluids. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/157947
Chicago Manual of Style (16th Edition):
Tian, Jing. “Study of Nonlinear Analysis and Chaos in Vibrations and Fluids.” 2016. Doctoral Dissertation, Texas A&M University. Accessed February 27, 2021.
http://hdl.handle.net/1969.1/157947.
MLA Handbook (7th Edition):
Tian, Jing. “Study of Nonlinear Analysis and Chaos in Vibrations and Fluids.” 2016. Web. 27 Feb 2021.
Vancouver:
Tian J. Study of Nonlinear Analysis and Chaos in Vibrations and Fluids. [Internet] [Doctoral dissertation]. Texas A&M University; 2016. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1969.1/157947.
Council of Science Editors:
Tian J. Study of Nonlinear Analysis and Chaos in Vibrations and Fluids. [Doctoral Dissertation]. Texas A&M University; 2016. Available from: http://hdl.handle.net/1969.1/157947
11.
Srinivasan, Ravi.
Closure and complete integrability in Burgers
turbulence.
Degree: PhD, Applied Mathematics, 2009, Brown University
URL: https://repository.library.brown.edu/studio/item/bdr:158/
► Burgers turbulence (1-D inviscid Burgers equation with random initial data) is a fundamental non-equilibrium model of stochastic coalescence. In this work we demonstrate that at…
(more)
▼ Burgers
turbulence (1-D inviscid Burgers equation with
random initial data) is a fundamental non-equilibrium model of
stochastic coalescence. In this work we demonstrate that at the
level of the 2-point correlation function, the entropy solution to
Burgers equation yields a closed, completely integrable system. We
show that the statistical evolution is given by a Lax pair.
Finally, we demonstrate that this equation has an equivalent
kinetic description with a rich family of self-similar solutions,
and in particular admits an explicit solution derived by Groeneboom
in nonparametric statistics. Finally, the closure property and
complete integrability are shown to hold in the general case of 1-D
scalar conservation laws with strictly convex flux.
Advisors/Committee Members: Menon, Govind (director), Menon, Govind (reader), Dafermos, Constantine (reader), Rozovsky, Boris (reader).
Subjects/Keywords: Burgers turbulence
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APA (6th Edition):
Srinivasan, R. (2009). Closure and complete integrability in Burgers
turbulence. (Doctoral Dissertation). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:158/
Chicago Manual of Style (16th Edition):
Srinivasan, Ravi. “Closure and complete integrability in Burgers
turbulence.” 2009. Doctoral Dissertation, Brown University. Accessed February 27, 2021.
https://repository.library.brown.edu/studio/item/bdr:158/.
MLA Handbook (7th Edition):
Srinivasan, Ravi. “Closure and complete integrability in Burgers
turbulence.” 2009. Web. 27 Feb 2021.
Vancouver:
Srinivasan R. Closure and complete integrability in Burgers
turbulence. [Internet] [Doctoral dissertation]. Brown University; 2009. [cited 2021 Feb 27].
Available from: https://repository.library.brown.edu/studio/item/bdr:158/.
Council of Science Editors:
Srinivasan R. Closure and complete integrability in Burgers
turbulence. [Doctoral Dissertation]. Brown University; 2009. Available from: https://repository.library.brown.edu/studio/item/bdr:158/
Oregon State University
12.
Chan, Pui Yuen.
Turbulent mixing across adjacent subchannels in packed rod bundles using conductivity measurement.
Degree: MS, Chemical Engineering, 1975, Oregon State University
URL: http://hdl.handle.net/1957/44289
► Turbulent mixing across adjacent subchannels in packed rod bundles was studied using conductivity measurement and sodium chloride solution as the tracer. Single phase water was…
(more)
▼ Turbulent mixing across adjacent subchannels in packed rod
bundles was studied using conductivity measurement and sodium
chloride solution as the tracer. Single phase water was the fluid
investigated.
The packed rod bundles were seven stainless steel tubes,
1.905 cm in diameter and 152.4 cm long, arranged in hexagonal close-packed
configuration and housed inside a 7.551 cm acrylic plastic
tube. The geometric configuration enabled simultaneous investigation
of turbulent mixing between triangular-triangular, triangular-trapezoidal
and trapezoidal-trapezoidal channels.
A set of coupled differential equations describing the mass
transport between adjacent channels in rod bundles was written using
the "lumped-parameter" approach which treated the large intersticies
between the rods as the differential elements. The channel lumping technique resulted in a 4-channel model
and a 2-channel model, reducing the number of differential equations
that had to be investigated.
A modified matrix method, made possible by successive data
collected, was used in evaluating the crossflow mixing coefficients.
The flow rate of water covered a range from 1000 cm³
to
5000 cm³. The gap spacing studied was 0.47 cm. The Reynolds number
covered was from 6 x 10³ to 2.5 x 10⁴.
The following were the result of the investigation:
1) The probe and the conductivity measurement is a very
promising means of tracer technique if some improvement is
made on the data-taking scheme.
2) The modified matrix technique evaluates the crossflow
mixing coefficient directly from the input and output concentration
data, provided there is very little or no error
associated with the concentration data.
3) The turbulent mixing coefficient is shown to be a strong
function of the subchannel Reynolds number.
4) Comparison with the works of the previous investigator shows
that the turbulent mixing coefficient is not a strong function
of gap spacing, it is indistinguishable within statistical
significance.
5) The turbulent mixing coefficient is shown to be a weak
function of subchannel geometry.
Advisors/Committee Members: Knudsen, James G. (advisor).
Subjects/Keywords: Turbulence
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APA (6th Edition):
Chan, P. Y. (1975). Turbulent mixing across adjacent subchannels in packed rod bundles using conductivity measurement. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/44289
Chicago Manual of Style (16th Edition):
Chan, Pui Yuen. “Turbulent mixing across adjacent subchannels in packed rod bundles using conductivity measurement.” 1975. Masters Thesis, Oregon State University. Accessed February 27, 2021.
http://hdl.handle.net/1957/44289.
MLA Handbook (7th Edition):
Chan, Pui Yuen. “Turbulent mixing across adjacent subchannels in packed rod bundles using conductivity measurement.” 1975. Web. 27 Feb 2021.
Vancouver:
Chan PY. Turbulent mixing across adjacent subchannels in packed rod bundles using conductivity measurement. [Internet] [Masters thesis]. Oregon State University; 1975. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1957/44289.
Council of Science Editors:
Chan PY. Turbulent mixing across adjacent subchannels in packed rod bundles using conductivity measurement. [Masters Thesis]. Oregon State University; 1975. Available from: http://hdl.handle.net/1957/44289
Oregon State University
13.
Jovanovic, Goran N.
Natural and forced turbulent mixing in rod bundles.
Degree: MS, Chemical Engineering, 1974, Oregon State University
URL: http://hdl.handle.net/1957/44768
► The effects of mass flow rate and subchannel configuration on the turbulent interchange between adjacent subchannel in simulated rod bundle were investigated. The simulated rod…
(more)
▼ The effects of mass flow rate and subchannel configuration on
the turbulent interchange between adjacent subchannel in simulated
rod bundle were investigated.
The simulated rod bundle was made by arranging seven 1.913 cm
diameter acrylic plastic rods in an equilateral triangular pattern in a
tube 8.89 cm inside diameter.
The overall test section was 152.4 cm in length with a 60.96 cm
long mixing section. Design of the test section allowed a study of
turbulent lateral mixing between triangular-triangular, triangular-trapezoidal
and trapezoidal-trapezoidal subchannels configuration.
A tracer technique was used with Rhodamine B dye as tracer.
Dye concentration was measured with two sets of hypodermic needles.
The tracer initially injected in one of the adjacent subchannels was
free to diffuse into the other subchannels. Using a lumped parameter approach, an analytical model was
developed to describe axial change of concentration along the test
section.
Measured concentration and subchannel mass flow rate were
used for numerical calculation of turbulent mixing rate.
Turbulent mixing rate in the rod bundle with wire wrap was also
investigated. Following are the results of this study:
1. Turbulent mixing is a function of the subchannel mass flow
rate, and increases when subchannel Reynolds number
increases.
2, Turbulent mixing is not significant function of the subchannel
configuration.
3. Subchannel mixing can be compared to turbulent mixing in the
turbulent core of a fluid flowing in a circular tube.
4. The flow conditions in the vicinity of the gap space are very
important, especially when mean velocities in adjacent
subchannels are not equal.
5. The friction factor for the rod bundle matrix with smooth
rods follows Blasius' equation.
6. Wire wraps on the rods increased mixing especially for the
higher Reynolds numbers.
Advisors/Committee Members: Knudsen, James G. (advisor).
Subjects/Keywords: Turbulence
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APA ·
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APA (6th Edition):
Jovanovic, G. N. (1974). Natural and forced turbulent mixing in rod bundles. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/44768
Chicago Manual of Style (16th Edition):
Jovanovic, Goran N. “Natural and forced turbulent mixing in rod bundles.” 1974. Masters Thesis, Oregon State University. Accessed February 27, 2021.
http://hdl.handle.net/1957/44768.
MLA Handbook (7th Edition):
Jovanovic, Goran N. “Natural and forced turbulent mixing in rod bundles.” 1974. Web. 27 Feb 2021.
Vancouver:
Jovanovic GN. Natural and forced turbulent mixing in rod bundles. [Internet] [Masters thesis]. Oregon State University; 1974. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1957/44768.
Council of Science Editors:
Jovanovic GN. Natural and forced turbulent mixing in rod bundles. [Masters Thesis]. Oregon State University; 1974. Available from: http://hdl.handle.net/1957/44768
Oregon State University
14.
Scheel, Randall Lee.
Turbulent mixing between adjacent triangular channels : measurement by two techniques.
Degree: MS, Chemical Engineering, 1973, Oregon State University
URL: http://hdl.handle.net/1957/45234
Subjects/Keywords: Turbulence
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APA ·
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APA (6th Edition):
Scheel, R. L. (1973). Turbulent mixing between adjacent triangular channels : measurement by two techniques. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/45234
Chicago Manual of Style (16th Edition):
Scheel, Randall Lee. “Turbulent mixing between adjacent triangular channels : measurement by two techniques.” 1973. Masters Thesis, Oregon State University. Accessed February 27, 2021.
http://hdl.handle.net/1957/45234.
MLA Handbook (7th Edition):
Scheel, Randall Lee. “Turbulent mixing between adjacent triangular channels : measurement by two techniques.” 1973. Web. 27 Feb 2021.
Vancouver:
Scheel RL. Turbulent mixing between adjacent triangular channels : measurement by two techniques. [Internet] [Masters thesis]. Oregon State University; 1973. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1957/45234.
Council of Science Editors:
Scheel RL. Turbulent mixing between adjacent triangular channels : measurement by two techniques. [Masters Thesis]. Oregon State University; 1973. Available from: http://hdl.handle.net/1957/45234
Oregon State University
15.
Wasowski, Stanley Francis.
Measurements of turbulent velocities and an examination of their effects on mixing and suspension of particulate matter.
Degree: MS, Oceanography, 1973, Oregon State University
URL: http://hdl.handle.net/1957/22966
► An experiment was conducted in which a three component drag probe was used to measure the three directional components of turbulent velocity. While velocity measurements…
(more)
▼ An experiment was conducted in which a three component drag probe was used to measure the three directional components of turbulent velocity. While velocity measurements were being made, water samples were taken and analyzed for salinity and suspended particulate matter. Three dimensional energy spectra were computed from the velocity records between .1 and 5 Hz. These were compared with theoretical values. In the wave-number ranges corresponding to the
inertial subrange the spectra showed good agreement with the -5/3 power law. Reynolds stress tensors were computed. The norms of the Reynolds' stresses were used in a multilinear Regression model for particulate matter concentration and vertical variability of particulate matter concentrations. Although crude, the models accounted for over 60 percent of the variability in measured concentrations and over half the variability in vertical coefficient of variation.
Advisors/Committee Members: Pak, Ha Song (advisor), Corder, S. (committee member).
Subjects/Keywords: Turbulence
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APA ·
Chicago ·
MLA ·
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Export
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Manager
APA (6th Edition):
Wasowski, S. F. (1973). Measurements of turbulent velocities and an examination of their effects on mixing and suspension of particulate matter. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/22966
Chicago Manual of Style (16th Edition):
Wasowski, Stanley Francis. “Measurements of turbulent velocities and an examination of their effects on mixing and suspension of particulate matter.” 1973. Masters Thesis, Oregon State University. Accessed February 27, 2021.
http://hdl.handle.net/1957/22966.
MLA Handbook (7th Edition):
Wasowski, Stanley Francis. “Measurements of turbulent velocities and an examination of their effects on mixing and suspension of particulate matter.” 1973. Web. 27 Feb 2021.
Vancouver:
Wasowski SF. Measurements of turbulent velocities and an examination of their effects on mixing and suspension of particulate matter. [Internet] [Masters thesis]. Oregon State University; 1973. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1957/22966.
Council of Science Editors:
Wasowski SF. Measurements of turbulent velocities and an examination of their effects on mixing and suspension of particulate matter. [Masters Thesis]. Oregon State University; 1973. Available from: http://hdl.handle.net/1957/22966
17.
Yang, Haodong.
Advanced turbulence models for recirculating flows.
Degree: Mechanical Engineering, 1994, Texas Tech University
URL: http://hdl.handle.net/2346/8951
► The standard k-e model has been widely used due to the simplicity and realistic predictions it makes. However, the standard k-e model has its disadvantage.…
(more)
▼ The standard k-e model has been widely used due to the simplicity and realistic predictions it makes. However, the standard k-e model has its disadvantage. It can only be applied in the high Reynolds number region of the flow where the viscous effect is less important. For flow close to a wall, where local Reynolds number is low and viscous effect dominates, the standard k-e model will not perform satisfactorily. The drawback has limited the first grid adjacent to the wall to be placed in the fully turbulent region which is not close enough to the wall to predict the wall effect on the flow. To tackle this near wall region, the common practice is to use an empirical wall function to approximate turbulence quantities for the grid adjacent to the wall and the standard k-e model for the rest of the grids. The wall function is a logarithmic profile correlated from boundary layer data.
Moreover, most of the success of the standard k-e model is limited to simple turbulent flows, such as boundary layer flows and flows in a plane duct with no recirculation. However, industrially, the most important flow, the turbulent flow, is separated in the presence of adverse pressure gradient, creating a recirculating region. In recirculating flows where the flow at a point is influenced by flow conditions upstream and downstream, the standard k-e model is known for underpredicting the recirculation region. This drawback in the standard k-e model has led researchers to look for a better turbulence model to predict recirculating flow.
In this study, some efforts were made to move from the standard k-e model to the higher level turbulence models that can predict recirculating flows. Basically, there are two ways to approach this purpose. Both approaches were pursued in this study. The first way is an easier approach, and this approach modifies the standard k-e model so that it works on both viscous and fully turbulent regions. The second way is to get rid of the unrealistic eddy-viscosity concept and study the multi-equation Reynolds stress model. A new Reynolds stress model, the SSG model of Speziale, Sarkar and Gatski [8], was investigated in this study. The original version of SSG model cannot predict recirculating flow. After a simple modification was made, it can work for predicting recirculating flow. However, the modified SSG model still has very poor performance in predicting recirculating flow. Further efforts are made to improve the SSG model, and a new SSG model is proposed in this study.
Subjects/Keywords: Turbulence
…Fluxes in x and y directions, respectively
h
Channel height or step height
k
Turbulence… …rate of turbulence energy
P'
Pressure correction
P^j
Production rate of Reynolds… …closed system. The system can be closed only
with the aid of "turbulence modeling."… …Launder and Spalding [19] stated that "a model of
turbulence means a set of… …x5D;.
Numerous turbulence models available in the literature. From lower to higher level…
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APA (6th Edition):
Yang, H. (1994). Advanced turbulence models for recirculating flows. (Thesis). Texas Tech University. Retrieved from http://hdl.handle.net/2346/8951
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):
Yang, Haodong. “Advanced turbulence models for recirculating flows.” 1994. Thesis, Texas Tech University. Accessed February 27, 2021.
http://hdl.handle.net/2346/8951.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Yang, Haodong. “Advanced turbulence models for recirculating flows.” 1994. Web. 27 Feb 2021.
Vancouver:
Yang H. Advanced turbulence models for recirculating flows. [Internet] [Thesis]. Texas Tech University; 1994. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/2346/8951.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Yang H. Advanced turbulence models for recirculating flows. [Thesis]. Texas Tech University; 1994. Available from: http://hdl.handle.net/2346/8951
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
18.
Fiscaletti, D.
Small-scale motions in turbulent boundary-free shear flows.
Degree: 2016, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:b5e1b250-8134-418e-8354-c75c86c37a9c
;
urn:NBN:nl:ui:24-uuid:b5e1b250-8134-418e-8354-c75c86c37a9c
;
urn:NBN:nl:ui:24-uuid:b5e1b250-8134-418e-8354-c75c86c37a9c
;
http://resolver.tudelft.nl/uuid:b5e1b250-8134-418e-8354-c75c86c37a9c
► The present work is an experimental and numerical investigation of the small-scale motions in turbulent free-shear flows. In the far-field turbulence of a jet at…
(more)
▼ The present work is an experimental and numerical investigation of the small-scale motions in turbulent free-shear flows. In the far-field
turbulence of a jet at high Reynolds number (Re? = 350) hot-wire anemometry (HWA) is applied to measure time series of flow velocity. By filtering these time series, large- and small-scale velocity fluctuations are obtained. Both the amplitude and the frequency of the small-scale signals are locally stronger (weaker) for positive (negative) fluctuations of the large-scale signal, which is refered to as amplitude and frequency modulation. The local amplitude and frequency of the small-scale signals increase monotonically with the strength of the large-scale velocity fluctuations. The same flow is also investigated with long-range ?PIV (microscopic Particle Image Velocimetry). The measurement is validated against the HWA signals by comparison of the
turbulence statistics. A validation based on the topological content is also performed. The coherent structures of vorticity and of intense dissipation are adequately resolved, and their characteristic size is assessed. It is found that the size of the vortical structures does not change significantly when conditioned on strongly-positive or strongly-negative large-scale velocity fluctuations. Using the PIV results the amplitude and frequency modulation observed from HWA signals is explained as an inhomogeneous distribution of the small-scale structures within the flow. In particular, the analysis of ?PIV data reveals that the intense vortical and dissipation structures tend to be preferentially located in high-velocity regions, hence they are characterized by convection velocities higher than the mean velocity of the flow. Furthermore, the spatially resolved velocity vector fields allow to quantify amplitude modulation directly in physical space. From this direct estimation in physical space, amplitude modulation is only 25% of the value measured from hot-wire anemometry. The remaining 75% comes from the fixed spectral band filter used to obtain the large- and the small-scale signals, which does not consider the local convection velocity (Taylor hypothesis of frozen
turbulence). A very similar overestimation of amplitude modulation when quantified in the time-frame is also confirmed analytically. Based on the experimental analysis on the jet an explanation for amplitude and frequency modulation is developed, which can be extended to other free-shear flows. The validity of this interpretation is assessed based on the analysis of Direct Numerical Simulations of a mixing layer, at the Reynolds number based on the Taylor microscale (Re? =) of 250. The local vorticity rms, taken as a measure of the small-scale activity, is found to be modulated by the large-scale velocity fluctuations depending on the position within the flow. In particular, on the low-speed side of the mixing layer, positive large-scale velocity fluctuations correspond to a stronger vorticity rms, whereas on the high-speed side, they correspond to a weaker vorticity rms.…
Advisors/Committee Members: Westerweel, J..
Subjects/Keywords: turbulence
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APA (6th Edition):
Fiscaletti, D. (2016). Small-scale motions in turbulent boundary-free shear flows. (Doctoral Dissertation). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:b5e1b250-8134-418e-8354-c75c86c37a9c ; urn:NBN:nl:ui:24-uuid:b5e1b250-8134-418e-8354-c75c86c37a9c ; urn:NBN:nl:ui:24-uuid:b5e1b250-8134-418e-8354-c75c86c37a9c ; http://resolver.tudelft.nl/uuid:b5e1b250-8134-418e-8354-c75c86c37a9c
Chicago Manual of Style (16th Edition):
Fiscaletti, D. “Small-scale motions in turbulent boundary-free shear flows.” 2016. Doctoral Dissertation, Delft University of Technology. Accessed February 27, 2021.
http://resolver.tudelft.nl/uuid:b5e1b250-8134-418e-8354-c75c86c37a9c ; urn:NBN:nl:ui:24-uuid:b5e1b250-8134-418e-8354-c75c86c37a9c ; urn:NBN:nl:ui:24-uuid:b5e1b250-8134-418e-8354-c75c86c37a9c ; http://resolver.tudelft.nl/uuid:b5e1b250-8134-418e-8354-c75c86c37a9c.
MLA Handbook (7th Edition):
Fiscaletti, D. “Small-scale motions in turbulent boundary-free shear flows.” 2016. Web. 27 Feb 2021.
Vancouver:
Fiscaletti D. Small-scale motions in turbulent boundary-free shear flows. [Internet] [Doctoral dissertation]. Delft University of Technology; 2016. [cited 2021 Feb 27].
Available from: http://resolver.tudelft.nl/uuid:b5e1b250-8134-418e-8354-c75c86c37a9c ; urn:NBN:nl:ui:24-uuid:b5e1b250-8134-418e-8354-c75c86c37a9c ; urn:NBN:nl:ui:24-uuid:b5e1b250-8134-418e-8354-c75c86c37a9c ; http://resolver.tudelft.nl/uuid:b5e1b250-8134-418e-8354-c75c86c37a9c.
Council of Science Editors:
Fiscaletti D. Small-scale motions in turbulent boundary-free shear flows. [Doctoral Dissertation]. Delft University of Technology; 2016. Available from: http://resolver.tudelft.nl/uuid:b5e1b250-8134-418e-8354-c75c86c37a9c ; urn:NBN:nl:ui:24-uuid:b5e1b250-8134-418e-8354-c75c86c37a9c ; urn:NBN:nl:ui:24-uuid:b5e1b250-8134-418e-8354-c75c86c37a9c ; http://resolver.tudelft.nl/uuid:b5e1b250-8134-418e-8354-c75c86c37a9c
Virginia Tech
19.
Goody, Michael.
An Experimental Investigation of Pressure Fluctuations in Three-Dimensional Turbulent Boundary Layers.
Degree: PhD, Aerospace and Ocean Engineering, 1999, Virginia Tech
URL: http://hdl.handle.net/10919/29908
► This dissertation presents experimental measurements and analysis of the surface pressure fluctuations beneath several turbulent boundary layers of practical interest. Pressure fluctuations in turbulent boundary…
(more)
▼ This dissertation presents experimental measurements and analysis of the surface pressure fluctuations beneath several turbulent boundary layers of practical interest. Pressure fluctuations in turbulent boundary layers are a source of noise and vibration that can accelerate structural fatigue. Pressure fluctuations and their correlation with velocity fluctuations is an important diffusive mechanism of
turbulence transport. The approach was to study the statistics of both the surface pressure and the velocity field through new measurements of the fluctuating surface pressure and existing measurements of the velocity field and the covariance of the surface pressure and fluctuating velocity components.
Measurements were made in three types of flows. The first type of flow was a zero pressure gradient, two-dimensional, turbulent boundary layer (Re(theta) = 7300 and Re(theta) = 23400). The two-dimensional flows serve as a baseline for comparison to the other three-dimensional flows and validate the experimental techniques used in the present study through comparison with existing measurements. The second type of flow was a three-dimensional, pressure-driven, turbulent boundary layer that forms away from a wing-body junction. Two of this type of boundary layer were studied - Re(theta) = 5940 and Re(theta) = 23200. The third type of flow was the separating flow about the leeside of a 6:1 prolate spheroid at angle of attack. Measurements were made at two angles of attack, 10° and 20°, and two axial locations, x/L = 0.600 and x/L = 0.772, in this type of flow.
Spectral scaling is discussed and various scaling combinations of the spectral power density of surface pressure fluctuations beneath two-dimensional boundary layers that cover a wide range of Reynolds number (1400 < Re(theta) < 23400) are presented. The spectral power density of surface pressure fluctuations beneath the separating flow on the leeside of a 6:1 prolate spheroid at 10° angle of attack collapse when normalized using viscous scales. However, the spectral power density of surface pressure fluctuations beneath highly three-dimensional flow contain nearly constant spectral levels within a middle to high frequency range. The nearly constant spectral levels are due to a lack of overlapping frequency structure between the large-scale motions and the viscous-dominated motions since each of these types of motion may have different flow histories due to the three-dimensional flow structure. This effect amplifies the importance of the middle frequency range to p' as compared to two-dimensional flows. In terms of instrumentation, accurate p' measurements in a three-dimensional flow require accurate high frequency (f > 20 kHz) p measurements.
The lack of similarity in the shape of the spectral power density preclude a direct extension of "universal" generalizations that are true for surface pressure fluctuations beneath two-dimensional boundary layers. The resulting RMS surface pressure fluctuation distributions reflect the importance of the high frequency wall…
Advisors/Committee Members: Simpson, Roger L. (committeechair), Olcmen, Semih M. (committee member), Devenport, William J. (committee member), Schetz, Joseph A. (committee member), Grossman, Bernard M. (committee member).
Subjects/Keywords: turbulence
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APA (6th Edition):
Goody, M. (1999). An Experimental Investigation of Pressure Fluctuations in Three-Dimensional Turbulent Boundary Layers. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/29908
Chicago Manual of Style (16th Edition):
Goody, Michael. “An Experimental Investigation of Pressure Fluctuations in Three-Dimensional Turbulent Boundary Layers.” 1999. Doctoral Dissertation, Virginia Tech. Accessed February 27, 2021.
http://hdl.handle.net/10919/29908.
MLA Handbook (7th Edition):
Goody, Michael. “An Experimental Investigation of Pressure Fluctuations in Three-Dimensional Turbulent Boundary Layers.” 1999. Web. 27 Feb 2021.
Vancouver:
Goody M. An Experimental Investigation of Pressure Fluctuations in Three-Dimensional Turbulent Boundary Layers. [Internet] [Doctoral dissertation]. Virginia Tech; 1999. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10919/29908.
Council of Science Editors:
Goody M. An Experimental Investigation of Pressure Fluctuations in Three-Dimensional Turbulent Boundary Layers. [Doctoral Dissertation]. Virginia Tech; 1999. Available from: http://hdl.handle.net/10919/29908
University of British Columbia
20.
Riahi, Ardeshir.
Turbulent swirling flow in short cylindrical chambers.
Degree: PhD, Mechanical Engineering, 1990, University of British Columbia
URL: http://hdl.handle.net/2429/30810
► The effects of aspect ratio (L/D) on the rate of decay of swirl in a cylindrical chamber were experimentally studied using the Laser-Doppler-Anemometry technique. Preliminary…
(more)
▼ The effects of aspect ratio (L/D) on the rate of decay of swirl in a cylindrical chamber were experimentally studied using the Laser-Doppler-Anemometry technique. Preliminary measurements revealed that water should be used as working fluid; the results pertaining to air were inferred from Reynolds number similarity.
The steady-state measurements revealed that a solid body type of rotation can be generated by a disc whose surface has been uniformly roughened. The effect of aspect ratio on the rate of decay of such flow field was studied in three chambers with aspect ratios in the range of interest to engine combustion. Experimental results showed a faster decay rate in the shorter chamber (i.e. smaller aspect ratio). This was attributed to the stronger swirl driven secondary flow pattern in the shorter chamber.
A mathematical model describing axi-symmetric, decaying, turbulent swirling flow inside a short cylindrical chamber was also developed. The model was numerically solved, using the control-volume analysis, to provide insight on swirl decay in engines. The model validation was based on experimental observations.
Turbulence parameters were represented by a two-equation turbulence model, modified for streamline curvature effects. The ad-hoc curvature modification of the standard k-e model proposed by Launder et al. and the mixing energy model developed by Saffman-Wilcox-Traci (SWT) were used to account for curvature effects. The analysis of steady flow between two long concentric cylinders, established the superiority of the latter over the former method. The SWT model was also successfully used in reproducing previously published experimental results, pertaining to decaying swirling flow field (mean velocity and turbulence intensity) in a short cylinder. The calculated turbulence intensity profile revealed that swirl promotes anisotropic turbulence.
The validated numerical model was used to predict the effect of aspect ratio on the rate of decay of the flow field observed by the experimental measurements in the present study. The overall prediction of decay rate was successful, leading to the conclusion that Wilcox and Chambers model can be used in predicting the behaviour of two-dimensional transient turbulent swirling flows.
Subjects/Keywords: Turbulence
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APA (6th Edition):
Riahi, A. (1990). Turbulent swirling flow in short cylindrical chambers. (Doctoral Dissertation). University of British Columbia. Retrieved from http://hdl.handle.net/2429/30810
Chicago Manual of Style (16th Edition):
Riahi, Ardeshir. “Turbulent swirling flow in short cylindrical chambers.” 1990. Doctoral Dissertation, University of British Columbia. Accessed February 27, 2021.
http://hdl.handle.net/2429/30810.
MLA Handbook (7th Edition):
Riahi, Ardeshir. “Turbulent swirling flow in short cylindrical chambers.” 1990. Web. 27 Feb 2021.
Vancouver:
Riahi A. Turbulent swirling flow in short cylindrical chambers. [Internet] [Doctoral dissertation]. University of British Columbia; 1990. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/2429/30810.
Council of Science Editors:
Riahi A. Turbulent swirling flow in short cylindrical chambers. [Doctoral Dissertation]. University of British Columbia; 1990. Available from: http://hdl.handle.net/2429/30810
University of British Columbia
21.
Wilson, John Ronald.
Some observed statistical properties of small scale turbulence.
Degree: PhD, Physics, 1974, University of British Columbia
URL: http://hdl.handle.net/2429/19211
► The purpose of this work was to investigate the characteristics of the small scales of the turbulent velocity and temperature fields in the atmospheric boundary…
(more)
▼ The purpose of this work was to investigate the characteristics of the small scales of the turbulent velocity and temperature fields in the atmospheric boundary layer. Of particular interest were the distributions of the spatial derivatives, the behaviour of the structure functions and the nature of the interactions leading to the inertial transfer of energy between the larger and smaller scales of the turbulent flow.
The observed statistical distributions of the differentiated downstream and X-wire signals did not accurately conform to the theoretically predicted logarithmic normal model although there was good general agreement. The distribution of the sum of the squares of the differentiated X-wire signals was described extremely well by the log normal model.
The temperature derivatives followed the log normal distribution somewhat better than did the velocity derivatives, but a poor signal to noise ratio prevented conclusive results.
The observed structure functions conformed to present theory for the velocity and temperature data.
The inertial transfer of energy in the downstream component was found to behave as would be intuitively expected. Specifically the net rate of arrival of energy was zero for wavenumbers where viscosity was unimportant and positive where viscosity was important. Interactions of scale sizes differing by more than a factor of ten in size did not contribute significantly to the energy transfers. The flow of downstream energy was observed to be from larger to smaller scale sizes for horizontal scales as large as twenty meters.
The mean inertial transfer of energy associated with interactions between downstream components only, was found to be approximately equal to the mean rate of energy loss due to the corresponding dissipation term.
Subjects/Keywords: Turbulence
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APA (6th Edition):
Wilson, J. R. (1974). Some observed statistical properties of small scale turbulence. (Doctoral Dissertation). University of British Columbia. Retrieved from http://hdl.handle.net/2429/19211
Chicago Manual of Style (16th Edition):
Wilson, John Ronald. “Some observed statistical properties of small scale turbulence.” 1974. Doctoral Dissertation, University of British Columbia. Accessed February 27, 2021.
http://hdl.handle.net/2429/19211.
MLA Handbook (7th Edition):
Wilson, John Ronald. “Some observed statistical properties of small scale turbulence.” 1974. Web. 27 Feb 2021.
Vancouver:
Wilson JR. Some observed statistical properties of small scale turbulence. [Internet] [Doctoral dissertation]. University of British Columbia; 1974. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/2429/19211.
Council of Science Editors:
Wilson JR. Some observed statistical properties of small scale turbulence. [Doctoral Dissertation]. University of British Columbia; 1974. Available from: http://hdl.handle.net/2429/19211
University of British Columbia
22.
Webster, Ian Taylor.
Study of isotropic structure in atmospheric boundary layer turbulence.
Degree: MS- MSc, Physics, 1972, University of British Columbia
URL: http://hdl.handle.net/2429/33707
► The two purposes of this study were to determine at what turbulent scales in a high Reynold's number shear flow the transition to isotropy occurs…
(more)
▼ The two purposes of this study were to determine at what turbulent scales in a high Reynold's number shear flow the transition to isotropy occurs and at what scales Taylor's 'frozen field' hypothesis is applicable. The flow studied was the wind at a height of z = 2 m. above a flat land surface. Four hot wire anemometers were mounted in a three dimensional array to collect data on the downwind turbulent velocity fluctuations. Cross spectra were computed from the observed data between three pairs of hot wires having the same spacing in different directions; these were varied between 1.8 m. and 2 cm. Knowing the observed spectrum of downwind velocity fluctuations and assuming the turbulence is isotropic, incompressible,
and obeys Taylor's hypothesis, theoretical cross spectra were computed.
The results of the comparison between the observed and theoretical cross spectra for different spacings revealed that in the flow studied the behaviour of the turbulence is consistent with the assumptions of both isotropy and Taylor's hypothesis for k₁z > 20, but for wave numbers less than this range either or both of the assumptions are not valid. However, between k₁z = 4 and k₁z = 20 the turbulence appears to be at least axisymmetric about the downstream direction and for k₁z > 3 that part of Taylor's hypothesis relating observed frequency at a stationary sensor to the downstream wave number component appears to be justified.
Subjects/Keywords: Turbulence
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APA (6th Edition):
Webster, I. T. (1972). Study of isotropic structure in atmospheric boundary layer turbulence. (Masters Thesis). University of British Columbia. Retrieved from http://hdl.handle.net/2429/33707
Chicago Manual of Style (16th Edition):
Webster, Ian Taylor. “Study of isotropic structure in atmospheric boundary layer turbulence.” 1972. Masters Thesis, University of British Columbia. Accessed February 27, 2021.
http://hdl.handle.net/2429/33707.
MLA Handbook (7th Edition):
Webster, Ian Taylor. “Study of isotropic structure in atmospheric boundary layer turbulence.” 1972. Web. 27 Feb 2021.
Vancouver:
Webster IT. Study of isotropic structure in atmospheric boundary layer turbulence. [Internet] [Masters thesis]. University of British Columbia; 1972. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/2429/33707.
Council of Science Editors:
Webster IT. Study of isotropic structure in atmospheric boundary layer turbulence. [Masters Thesis]. University of British Columbia; 1972. Available from: http://hdl.handle.net/2429/33707
University of British Columbia
23.
Pui, Nam Kiong.
The plane mixing region between parallel streams.
Degree: Master of Applied Science - MASc, Mechanical Engineering, 1969, University of British Columbia
URL: http://hdl.handle.net/2429/34589
► An experimental study of a mixing layer between two uniform parallel streams is undertaken for three velocity ratios: 0.81, 0.75 and 0.65. It is found…
(more)
▼ An experimental study of a mixing layer between two uniform parallel streams is undertaken for three velocity ratios: 0.81, 0.75 and 0.65. It is found that the mixing layer grows linearly with streamwise distance in each case, as anticipated. Except in the very intermittent region, the mean velocity profiles agree with Görtler's theoretical prediction based on the assumption that the eddy viscosity is constant across the flow. The measurement of turbulent intensities and shear stress provide
evidence that the flow becomes self preserving. The non-dimensional longitudinal intensity is symmetrical about the average velocity point, and is independent of the velocity ratio; although other non-dimensional Reynolds stress distributions are roughly independent of velocity ratio, they are not symmetrical. The shear stress calculated from the two dimensional mean equation of motion agrees well with measured values.
Subjects/Keywords: Turbulence.
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APA (6th Edition):
Pui, N. K. (1969). The plane mixing region between parallel streams. (Masters Thesis). University of British Columbia. Retrieved from http://hdl.handle.net/2429/34589
Chicago Manual of Style (16th Edition):
Pui, Nam Kiong. “The plane mixing region between parallel streams.” 1969. Masters Thesis, University of British Columbia. Accessed February 27, 2021.
http://hdl.handle.net/2429/34589.
MLA Handbook (7th Edition):
Pui, Nam Kiong. “The plane mixing region between parallel streams.” 1969. Web. 27 Feb 2021.
Vancouver:
Pui NK. The plane mixing region between parallel streams. [Internet] [Masters thesis]. University of British Columbia; 1969. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/2429/34589.
Council of Science Editors:
Pui NK. The plane mixing region between parallel streams. [Masters Thesis]. University of British Columbia; 1969. Available from: http://hdl.handle.net/2429/34589
24.
Cheng, Ye, 1983-.
A study of the fine-scale three-dimensional flow structures in turbulence using time-resolved stereoscopic scanning particle image velocimetry.
Degree: Mechanical and Aerospace Engineering, 2011, Rutgers University
URL: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000063353
Subjects/Keywords: Turbulence
…4
1.4 REVIEW OF PIV TECHNIQUES USED IN THE STUDY OF TURBULENCE… …68
Chapter 5 Statistical Analysis of Turbulence… …importance, as turbulence has the
ability to transport and mix fluid very effectively. The study of… …turbulence is also of great
interest to researchers as it occurs in many natural and manmade flows… …and the
understanding of mass, momentum and energy transport in turbulence has both…
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APA (6th Edition):
Cheng, Ye, 1. (2011). A study of the fine-scale three-dimensional flow structures in turbulence using time-resolved stereoscopic scanning particle image velocimetry. (Thesis). Rutgers University. Retrieved from http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000063353
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):
Cheng, Ye, 1983-. “A study of the fine-scale three-dimensional flow structures in turbulence using time-resolved stereoscopic scanning particle image velocimetry.” 2011. Thesis, Rutgers University. Accessed February 27, 2021.
http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000063353.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Cheng, Ye, 1983-. “A study of the fine-scale three-dimensional flow structures in turbulence using time-resolved stereoscopic scanning particle image velocimetry.” 2011. Web. 27 Feb 2021.
Vancouver:
Cheng, Ye 1. A study of the fine-scale three-dimensional flow structures in turbulence using time-resolved stereoscopic scanning particle image velocimetry. [Internet] [Thesis]. Rutgers University; 2011. [cited 2021 Feb 27].
Available from: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000063353.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Cheng, Ye 1. A study of the fine-scale three-dimensional flow structures in turbulence using time-resolved stereoscopic scanning particle image velocimetry. [Thesis]. Rutgers University; 2011. Available from: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000063353
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Aberdeen
25.
Newlands, Kristin.
Numerical investigation of the flow structure in an annular channel with inter-rod spacing.
Degree: PhD, 2014, University of Aberdeen
URL: https://abdn.alma.exlibrisgroup.com/view/delivery/44ABE_INST/12152989890005941
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.629400
► Component failures due to excessive flow-induced vibration in reactor cores and steam generators affect the performance and reliability of nuclear power stations around the world.…
(more)
▼ Component failures due to excessive flow-induced vibration in reactor cores and steam generators affect the performance and reliability of nuclear power stations around the world. Numerous investigations on the axial flow within tube bundles have identified the presence of potentially damaging low frequency, large-scale co- herent patterns. This Thesis reports a first detailed investigation into the effect of a streamwise separation between each pair of consecutive rod bundles on the flow structure. Turbulent flow in an annular channel with a sudden expansion between the inner cylinders is studied numerically. The calculations are performed using wall-resolved Large Eddy Simulation (LES) for which the generation of turbulent inlet conditions is achieved through the development and evaluation of the precur- sor and recycling inlet methods in the framework of Code Saturne. Results are presented for a fully concentric configuration in which three streamwise separation lengths based on the inner rod diameter, Drod, are considered, namely 2 × Drod (‘2Dc' case), 4×Drod (‘4Dc' case) and 6×Drod (‘6Dc' case). It is shown that the flow structure in the inter-rod spacing is highly dependent on the length of the streamwise gap. The characteristic flow features discerned in the narrow ‘2Dc' case suggest a striking similarity with flow over d-type rib-roughness, whereas the larger gap lengths in the ‘4Dc' and ‘6Dc' configurations lead to flow patterns comparable to those in k-type roughness. The effect of downstream eccentricity is examined for configurations with a streamwise gap length of 2 × Drod (‘2De' case) and 6 × Drod (‘6De' case). The results reveal that the misalignment of the downstream rod with respect to the upstream cylinder has a significant impact on the flow behaviour in the narrow ‘2De' case, whilst the ‘6De' case presents reasonable agreement with its concentric counterpart.
Subjects/Keywords: 620; Turbulence
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APA (6th Edition):
Newlands, K. (2014). Numerical investigation of the flow structure in an annular channel with inter-rod spacing. (Doctoral Dissertation). University of Aberdeen. Retrieved from https://abdn.alma.exlibrisgroup.com/view/delivery/44ABE_INST/12152989890005941 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.629400
Chicago Manual of Style (16th Edition):
Newlands, Kristin. “Numerical investigation of the flow structure in an annular channel with inter-rod spacing.” 2014. Doctoral Dissertation, University of Aberdeen. Accessed February 27, 2021.
https://abdn.alma.exlibrisgroup.com/view/delivery/44ABE_INST/12152989890005941 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.629400.
MLA Handbook (7th Edition):
Newlands, Kristin. “Numerical investigation of the flow structure in an annular channel with inter-rod spacing.” 2014. Web. 27 Feb 2021.
Vancouver:
Newlands K. Numerical investigation of the flow structure in an annular channel with inter-rod spacing. [Internet] [Doctoral dissertation]. University of Aberdeen; 2014. [cited 2021 Feb 27].
Available from: https://abdn.alma.exlibrisgroup.com/view/delivery/44ABE_INST/12152989890005941 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.629400.
Council of Science Editors:
Newlands K. Numerical investigation of the flow structure in an annular channel with inter-rod spacing. [Doctoral Dissertation]. University of Aberdeen; 2014. Available from: https://abdn.alma.exlibrisgroup.com/view/delivery/44ABE_INST/12152989890005941 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.629400
26.
Hassaini, Roumaissa.
Etude de la turbulence d'ondes élastiques et gravito-capillaires : de l'idéal théorique aux conditions réelles ? : Study of turbulence of elastic and gravity-capillary waves : beyond the weak turbulence theory ?.
Degree: Docteur es, Mécanique des fluides Energétique, Procédés, 2018, Université Grenoble Alpes (ComUE)
URL: http://www.theses.fr/2018GREAI064
► La turbulence d'onde faible (TTF) est une théorie statistique appliquée à un ensemble d'ondes aléatoires non cohérentes et dispersives. En supposant un domaine infini et…
(more)
▼ La turbulence d'onde faible (TTF) est une théorie statistique appliquée à un ensemble d'ondes aléatoires non cohérentes et dispersives. En supposant un domaine infini et une nonlinéarité infinitésimale, une prédiction sur la cascade d'énergie entre échelles par le biais d'interactions résonantes des échelles d'injection aux échelles dissipatives est alors possible. La théorie semble souvent mise en défaut par la confrontation expérimentale pour les ondes de surface. Une explication potentielle de cette divergence entre expérience et théorie est l'aspect fortement restrictif des hypothèses nécessaires à la validité de la théorie. Nous proposons dans cette thèse d'explorer l'impact du non-respect de certaines de ces hypothèses sur les propriétés statistiques de la turbulence. Des expériences à l'interface de deux liquides non-miscibles ont été entreprises afin d'étudier l'impact de l'augmentation de la dissipation visqueuse et donc de la réduction du temps dissipatif sur la mise en place de la cascade d'énergie. Une expérience à la surface de l'eau avec un confinement progressif de la largeur de la cuve a été effectuée afin d'observer une potentielle coexistence de la turbulence discrète, dans la direction confinée, et continue, dans la direction non confinée. Une analyse expérimentale des ondes gravito-capillaires où la dispersion a été réduite a permis de mettre en lumière une transition d'un régime de TTF vers un régime contenant des structures cohérentes localisées que sont les solitons. Afin de vérifier si une telle transition peut être visible sur un système physique différent, une étude expérimentale et numérique ont été conduites sur les ondes dans une plaque élastique précontrainte. Dans ce milieu l'effet de dispersion des ondes de flexion et en compétition avec le caractère non-dispersif des ondes de tension. Nous nous intéresserons par ailleurs numériquement aux régimes faiblement et fortement non-linéaires des ondes purement non-dispersives dans la membrane.
Weak wave turbulence (WTT) is a statistical theory applied to a large number of incoherent and dispersive waves. Based on the hypothesis of small non-linearity and infinite domain the theory predicts an energy cascade from the forcing scales to the dissipative scales. The confrontation of WTT to experiment for surface waves raises many inconsistencies. The strong hypotheses on which is developed the WWT may be the explanation of such disparity between experiment and theory. The aim of this Thesis is to investigate the impact of the invalidation of some of these conditions on the statistical properties of turbulence. Experiments of interfacial waves between two non-miscible fluids with different viscosities have been carried out to characterize the effect of the increase of viscous dissipation on the energy cascade. An experiment at the surface of water with an increasing confinement of the width of the vessel has been done in order to possibly observe a co-existence between discrete turbulence and classical turbulence. An experimental study of…
Advisors/Committee Members: Mordant, Nicolas (thesis director).
Subjects/Keywords: Turbulence; Ondes élastiques; Ondes capillaires; Turbulence faible; Turbulence forte; Turbulence; Elastic waves; Capillary waves; Strong turbulence; Weak turbulence; 530
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APA (6th Edition):
Hassaini, R. (2018). Etude de la turbulence d'ondes élastiques et gravito-capillaires : de l'idéal théorique aux conditions réelles ? : Study of turbulence of elastic and gravity-capillary waves : beyond the weak turbulence theory ?. (Doctoral Dissertation). Université Grenoble Alpes (ComUE). Retrieved from http://www.theses.fr/2018GREAI064
Chicago Manual of Style (16th Edition):
Hassaini, Roumaissa. “Etude de la turbulence d'ondes élastiques et gravito-capillaires : de l'idéal théorique aux conditions réelles ? : Study of turbulence of elastic and gravity-capillary waves : beyond the weak turbulence theory ?.” 2018. Doctoral Dissertation, Université Grenoble Alpes (ComUE). Accessed February 27, 2021.
http://www.theses.fr/2018GREAI064.
MLA Handbook (7th Edition):
Hassaini, Roumaissa. “Etude de la turbulence d'ondes élastiques et gravito-capillaires : de l'idéal théorique aux conditions réelles ? : Study of turbulence of elastic and gravity-capillary waves : beyond the weak turbulence theory ?.” 2018. Web. 27 Feb 2021.
Vancouver:
Hassaini R. Etude de la turbulence d'ondes élastiques et gravito-capillaires : de l'idéal théorique aux conditions réelles ? : Study of turbulence of elastic and gravity-capillary waves : beyond the weak turbulence theory ?. [Internet] [Doctoral dissertation]. Université Grenoble Alpes (ComUE); 2018. [cited 2021 Feb 27].
Available from: http://www.theses.fr/2018GREAI064.
Council of Science Editors:
Hassaini R. Etude de la turbulence d'ondes élastiques et gravito-capillaires : de l'idéal théorique aux conditions réelles ? : Study of turbulence of elastic and gravity-capillary waves : beyond the weak turbulence theory ?. [Doctoral Dissertation]. Université Grenoble Alpes (ComUE); 2018. Available from: http://www.theses.fr/2018GREAI064
27.
Mezemate, Yacine.
Analyse et modélisation multifractales des interactions ondes-turbulence-biologie dans un lac urbain : Multifractal analysis and simulation of turbulence, waves and biochemistry interactions in small urban lakes.
Degree: Docteur es, Sciences et Techniques de l'Environnement, 2014, Université Paris-Est
URL: http://www.theses.fr/2014PEST1166
► Les recherches en milieu lacustre ont généralement porté sur les grands lacs naturels et les barrages. Or les défis scientifiques que présentent les lacs urbains…
(more)
▼ Les recherches en milieu lacustre ont généralement porté sur les grands lacs naturels et les barrages. Or les défis scientifiques que présentent les lacs urbains sont nombreux du fait de leur faible profondeur et de leur extension .Le travail que nous présentons ici s'inscrit dans le cadre du projet Petits Lacs Urbains Mesures Modèles Multi-Echelles (PLUMMME), projet financé par la région Île-de-France (programme DIM R2DS).Ce projet a permis l'équipement du lac de Créteil en mesures à haute résolution. Ce sont ces mesures physiques et biologiques qui sont essentiellement exploitées dans cette thèse, parfois en comparaison avec celles du lac du Bourget. La première étape de cette thèse a été ainsi d'enrichir la base de données déjà disponible. Pour cela, nous avons mis en place une station de mesure en continu (capteurs de température, chlorophylle et luminosité, données météorologique telles que vitesse du vent et température atmosphérique), ainsi que deux chaînes de mesures comportant différents capteurs. Des campagnes de mesures spécifiques ont également été réalisées pour l'étude de hydrodynamique à l'aide d'un courantomètre de type Acoustic Doppler Velocimeter (ADV), ainsi qu'un profileur de type Acoustic Doppler Current Profilers (ADCP) à deux points différents du lac (point central et point du rejet d'eaux pluviales). L'analyse des différents champs montre que le lac présente des stratifications avec une période d'une semaine. Nous avons également identifié les modes d'oscillations des ondes internes lorsque ces dernières se produisent sous l'effet du vent. L'analyse spectrale a permis de mettre en évidence une première propriété d'invariance d'échelle des différents champs mesurés. Les différents processus physique (
turbulence, stratification, écoulement proche de la paroi) opérant le long de la colonne d'eau ont également été caractérisés. L'analyse spectrale ne permet pas de mettre en évidence le caractère intermittent des fluctuations des champs mesurés, ces dernières peuvent par contre être analysées à l'aide des techniques multifractales. Dans cette thèse nous avons montré que lorsqu'il existe une dépendance entre deux champs, celle ci est multi-échelle. L'utilisation du modèle multifractal universel (UM) a permis de quantifier le degré de cette dépendance. La qualité de l'estimation des paramètres UM dépend fortement de celle de l'invariance d'échelle observée: des séries temporelles présentant des tendances ne respectent pas cette invariance. Les effets de ces dernières sur l'estimation des paramètres UM peuvent être éliminés en utilisant la méthode de décomposition empirique modale dans l'espace physique. L'utilisation des données du champ de vitesse mesuré à l'aide de l'ADCP montre que, les pentes des spectres suivent un profil logarithmique selon la verticale, cela met en évidence que différents processus physiques opèrent le long de la colonne d'eau. Nous montrons également que l'hydrodynamique du lac est fortement perturbée à petite échelle au point du rejet d'eau pluviale. La dernière partie de la…
Advisors/Committee Members: Schertzer, Daniel (thesis director).
Subjects/Keywords: Turbulence; Multifractal; Ondes; Turbulence; Multifractal; Waves
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APA (6th Edition):
Mezemate, Y. (2014). Analyse et modélisation multifractales des interactions ondes-turbulence-biologie dans un lac urbain : Multifractal analysis and simulation of turbulence, waves and biochemistry interactions in small urban lakes. (Doctoral Dissertation). Université Paris-Est. Retrieved from http://www.theses.fr/2014PEST1166
Chicago Manual of Style (16th Edition):
Mezemate, Yacine. “Analyse et modélisation multifractales des interactions ondes-turbulence-biologie dans un lac urbain : Multifractal analysis and simulation of turbulence, waves and biochemistry interactions in small urban lakes.” 2014. Doctoral Dissertation, Université Paris-Est. Accessed February 27, 2021.
http://www.theses.fr/2014PEST1166.
MLA Handbook (7th Edition):
Mezemate, Yacine. “Analyse et modélisation multifractales des interactions ondes-turbulence-biologie dans un lac urbain : Multifractal analysis and simulation of turbulence, waves and biochemistry interactions in small urban lakes.” 2014. Web. 27 Feb 2021.
Vancouver:
Mezemate Y. Analyse et modélisation multifractales des interactions ondes-turbulence-biologie dans un lac urbain : Multifractal analysis and simulation of turbulence, waves and biochemistry interactions in small urban lakes. [Internet] [Doctoral dissertation]. Université Paris-Est; 2014. [cited 2021 Feb 27].
Available from: http://www.theses.fr/2014PEST1166.
Council of Science Editors:
Mezemate Y. Analyse et modélisation multifractales des interactions ondes-turbulence-biologie dans un lac urbain : Multifractal analysis and simulation of turbulence, waves and biochemistry interactions in small urban lakes. [Doctoral Dissertation]. Université Paris-Est; 2014. Available from: http://www.theses.fr/2014PEST1166
Colorado State University
28.
Karimpour, Farid.
Turbulence modeling of stably stratified wall-bounded flows.
Degree: PhD, Civil and Environmental Engineering, 2014, Colorado State University
URL: http://hdl.handle.net/10217/88442
► The subject of wall-bounded flows has been a matter of discussion and has received considerable attention in the past few decades. This is mainly attributed…
(more)
▼ The
subject of wall-bounded flows has been a matter of discussion and has received considerable attention in the past few decades. This is mainly attributed to the fact that the presence of the solid wall has profound effects on the
turbulence and hence results in anomalous mixing and transport of momentum, scalar and heat in environmental flows. This is much more intense in the vicinity of the solid wall commonly known as the near-wall region compared to regions away from the wall. This effect will be more complicated in the presence of density stratification which has a strong influence on the development of
turbulence. Therefore, numerous field, laboratory, numerical and theoretical studies are performed in a quest to gain a better understanding of wall-bounded flows especially in the presence of stratification. However, there is still a lack of a clear picture on the near-wall flow properties, the onset of
turbulence and the resulting mixing in wall-bounded flows. The aim of this dissertation is to employ both theory and numerical simulations to revisit mixing in wall-bounded flows, especially in the near-wall region. The main objectives are: • To investigate the unstratified near-wall
turbulence and revisit the turbulent (eddy) viscosity (νt) formulation in unstratified wall-bounded flows. This will be followed by derivation of a novel proposition for the appropriate velocity, length and time scales in unstratified wall-bounded flows. • To revisit the fundamentals of common Reynolds-averaged Navier-Stokes (RANS) closure schemes such as the standard k-ε model and investigate their capability to model near-wall
turbulence. • To investigate the turbulent mixing in stably stratified wall-bounded flows. The mixing of momentum, scalar and the efficiency of the mixing are evaluated. • To study wall-bounded turbulent flows in the presence of stable stratification by performing one-dimensional RANS simulations. In particular, this includes introduction of a modified turbulent Prandtl number (Prt) for wall-bounded flows and calibration of the standard k-ε model. In this dissertation, a novel formulation for the turbulent (eddy) viscosity given by ν=ε/(S2) is derived by assuming equilibrium between the turbulent kinetic energy production rate P and the dissipation rate of the turbulent kinetic energy (ε), where S is the mean shear rate. Also, the relevant scales of length and velocity are derived. The propositions are tested with the direct numerical simulation (DNS) data of unstratified turbulent channel flow of Hoyas & Jiménez (2006) and unstratified turbulent boundary layer flow of Sillero et al. (2013). The comparisons of the propositions with the exact computations from the DNS data are excellent. Furthermore, the suitability of the equilibrium assumption (i.e. P ≈ ε) for modeling near-wall
turbulence is revisited. This is important as most widely used turbulent viscosities such as the formulation of the standard k-ε model are developed by using the equilibrium assumption. It is analytically shown…
Advisors/Committee Members: Venayagamoorthy, Subhas K. (advisor), Birner, Thomas (committee member), Bledsoe, Brian P. (committee member), Julien, Pierre Y. (committee member).
Subjects/Keywords: stratified flows; wall-bounded turbulence; turbulence modeling
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APA (6th Edition):
Karimpour, F. (2014). Turbulence modeling of stably stratified wall-bounded flows. (Doctoral Dissertation). Colorado State University. Retrieved from http://hdl.handle.net/10217/88442
Chicago Manual of Style (16th Edition):
Karimpour, Farid. “Turbulence modeling of stably stratified wall-bounded flows.” 2014. Doctoral Dissertation, Colorado State University. Accessed February 27, 2021.
http://hdl.handle.net/10217/88442.
MLA Handbook (7th Edition):
Karimpour, Farid. “Turbulence modeling of stably stratified wall-bounded flows.” 2014. Web. 27 Feb 2021.
Vancouver:
Karimpour F. Turbulence modeling of stably stratified wall-bounded flows. [Internet] [Doctoral dissertation]. Colorado State University; 2014. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10217/88442.
Council of Science Editors:
Karimpour F. Turbulence modeling of stably stratified wall-bounded flows. [Doctoral Dissertation]. Colorado State University; 2014. Available from: http://hdl.handle.net/10217/88442
Georgia Tech
29.
Fernandez, Cody.
Measurement techniques used to determine atmospheric structure parameter.
Degree: MS, Electrical and Computer Engineering, 2019, Georgia Tech
URL: http://hdl.handle.net/1853/61318
► The objective of the proposed research is to compare and analyze the effectiveness of different atmospheric structure constant (Cn2) measurement techniques using data collected in…
(more)
▼ The objective of the proposed research is to compare and analyze the effectiveness of different atmospheric structure constant (Cn2) measurement techniques using data collected in a field test. Cn2 is a value used to convey the strength of optical
turbulence in units of m^-2/3. Cn2 data was collected using the following equipment: Integrated Atmospheric
Characterization System (IACS), Delayed Tilt Anisoplanatism Imaging Path Atmospheric
Turbulence Monitor (DELTA), Path-Resolved Optical Profiler (PROPS), a Scintec BLS-900 Large Aperture Scintillometer (LAS) and a Kipp & Zonen (K&Z) LAS system. The testing facility at Kennedy Space Center was chosen for its controlled airspace and 5km precision-leveled runway.
Advisors/Committee Members: Bennett, Gisele (advisor), Citrin, David (committee member), Valenta, Christpher R. (committee member), LeMaster, Daniel (committee member).
Subjects/Keywords: Optical turbulence; Atmospheric optical turbulence; Atmospheric sciences
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APA (6th Edition):
Fernandez, C. (2019). Measurement techniques used to determine atmospheric structure parameter. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/61318
Chicago Manual of Style (16th Edition):
Fernandez, Cody. “Measurement techniques used to determine atmospheric structure parameter.” 2019. Masters Thesis, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/61318.
MLA Handbook (7th Edition):
Fernandez, Cody. “Measurement techniques used to determine atmospheric structure parameter.” 2019. Web. 27 Feb 2021.
Vancouver:
Fernandez C. Measurement techniques used to determine atmospheric structure parameter. [Internet] [Masters thesis]. Georgia Tech; 2019. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/61318.
Council of Science Editors:
Fernandez C. Measurement techniques used to determine atmospheric structure parameter. [Masters Thesis]. Georgia Tech; 2019. Available from: http://hdl.handle.net/1853/61318
30.
Shurgalina, Ekaterina.
Dynamique de champs de vagues irréguliers en zone côtière : Dynamics of irregular wave ensembles in the coastal zone.
Degree: Docteur es, Mécanique et physique des fluides, 2015, Ecole centrale de Marseille; Ecole centrale de Marseille; Nizhny Novgorod State Technical Univercity
URL: http://www.theses.fr/2015ECDM0002
► Les vagues et les ondes internes de gravité ont un impact important surl’hydrodynamique et l’hydrologie de la zone côtière. Les vagues extrêmes sontparticulièrement intéressantes à…
(more)
▼ Les vagues et les ondes internes de gravité ont un impact important surl’hydrodynamique et l’hydrologie de la zone côtière. Les vagues extrêmes sontparticulièrement intéressantes à étudier, car elles sont une menace sérieuse pour letransport maritime, les plates-formes pétrolières, les installations portuaires et leszones touristiques de la côte. Ces ondes entravent aussi les activités humainesdéveloppées à la côte. Les ondes internes non linéaires affectent la biosphèreaquatique, notamment le transport de sédiments et créent des affouillements à labase des plates-formes et des pipelines. Elles affectent également la propagationdes signaux acoustiques. Les vagues scélérates provoquent d’importants dégâtsmatériels et de nombreuses pertes en vies humaines. Par conséquent, l’étude de laformation des ondes scélérates dans la zone côtière est d’une importance capitale.L'objectif principal de la thèse est l'étude de la formation d’ondes océaniquesanormales dans la zone côtières pour différentes profondeurs d’eau et différentschamps d'ondes. Il est montré que le mécanisme de focalisation dispersive àl’origine de la formation d’ondes scélérates est pertinent quand les ondesinteragissent avec une paroi verticale. Il est démontré que juste avant la formationde l’onde maximale, celle-ci change rapidement de forme, d'une haute crête vers uncreux profond. La durée de vie de l’onde scélérate augmente avec le nombred’ondes individuelles contenues dans le paquet d'ondes anormales et lorsque laprofondeur de l'eau diminue.Il est démontré que l'interaction de paires de solitons unipolaires conduit à unediminution des facteurs de dissymétrie et d’aplatissement du champ d'ondes. Il estprouvé que dans le cas d'interactions hétéropolaires de solitons, le facteurd’aplatissement augmente.La dynamique non linéaire de champs de solitons unipolaires aléatoires estétudiée dans le cadre de l’équation de Korteweg - de Vries (KdV) et de l’équationde Korteweg - de Vries modifiée (mKdV). Il est montré que les coefficients dedissymétrie et d'aplatissement du gaz de solitons sont réduits à la suite de collisionsde solitons. Les fonctions de distribution des amplitudes des ondes sont obtenues.Le comportement des champs solitoniques dans le cadre de ces modèles estqualitativement similaire. Il est démontré que l'amplitude des ondes extrêmesdiminue en moyenne en raison des interactions entre multi-solitons.Dans le cadre de l'équation de Korteweg-de Vries modifiée, les interactionsnon linéaires entre le soliton de plus petite amplitude et les autres solitons du gazont pour effet de réduire sa célérité qui devient négative et de modifier ainsi sadirection de propagation.A partir de l'équation de Korteweg-de Vries modifiée, il est prouvé que dans ungaz de solitons héteropolaires, des ondes scélérates peuvent se former. Laprobabilité d’occurrence et l’amplitude des ondes scélérates dans de tels systèmesaugmente avec la densité du gaz de solitons.
Surface and internal gravity waves have an important impact on the hydrological regime ofthe coastal zone.…
Advisors/Committee Members: Kharif, Christian (thesis director), Pelinovsky, Efim (thesis director).
Subjects/Keywords: Équations modèles; Turbulence; Model equations; Turbulence
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APA ·
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APA (6th Edition):
Shurgalina, E. (2015). Dynamique de champs de vagues irréguliers en zone côtière : Dynamics of irregular wave ensembles in the coastal zone. (Doctoral Dissertation). Ecole centrale de Marseille; Ecole centrale de Marseille; Nizhny Novgorod State Technical Univercity. Retrieved from http://www.theses.fr/2015ECDM0002
Chicago Manual of Style (16th Edition):
Shurgalina, Ekaterina. “Dynamique de champs de vagues irréguliers en zone côtière : Dynamics of irregular wave ensembles in the coastal zone.” 2015. Doctoral Dissertation, Ecole centrale de Marseille; Ecole centrale de Marseille; Nizhny Novgorod State Technical Univercity. Accessed February 27, 2021.
http://www.theses.fr/2015ECDM0002.
MLA Handbook (7th Edition):
Shurgalina, Ekaterina. “Dynamique de champs de vagues irréguliers en zone côtière : Dynamics of irregular wave ensembles in the coastal zone.” 2015. Web. 27 Feb 2021.
Vancouver:
Shurgalina E. Dynamique de champs de vagues irréguliers en zone côtière : Dynamics of irregular wave ensembles in the coastal zone. [Internet] [Doctoral dissertation]. Ecole centrale de Marseille; Ecole centrale de Marseille; Nizhny Novgorod State Technical Univercity; 2015. [cited 2021 Feb 27].
Available from: http://www.theses.fr/2015ECDM0002.
Council of Science Editors:
Shurgalina E. Dynamique de champs de vagues irréguliers en zone côtière : Dynamics of irregular wave ensembles in the coastal zone. [Doctoral Dissertation]. Ecole centrale de Marseille; Ecole centrale de Marseille; Nizhny Novgorod State Technical Univercity; 2015. Available from: http://www.theses.fr/2015ECDM0002
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Open Access Theses and Dissertations
