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Rozprawy doktorskie na temat „Turbulent”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 25 lipca 2025

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1

Sung, Kyung-Sub. "Turbulent dispersion in strongly stratified turbulence." Thesis, Imperial College London, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.582577.

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The first part is the derivation of one-particle vertical diffusion for stably stratified turbulence with or without rapid rotation. Nicolleau & Vassilicos (2000) have analytically calculated vertical one-particle diffusion in stably stratified turbulence without rotation. One-particle vertical diffusion for turbulence with stable stratification and with or without rapid rotation has been derived here analytically using the solutions of the linearized equations of motions. The second part is an attempt to explain the depletion of horizontal pair diffusion in strongly stratified turbulence. "Re
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2

Alves, Portela Felipe. "Turbulence cascade in an inhomogeneous turbulent flow." Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/63233.

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The inhomogeneous, anisotropic turbulence downstream of a square prism is investigated by means of direct numerical simulations (DNS) and two-point statistics. As noted by Moffatt (2002) “it now seems that the intense preoccupation [...] with the problem of homogeneous isotropic turbulence was perhaps misguided” acknowledging there is now a revived interest in studying inhomogeneous turbulence. The full description of the turbulence cascade requires a two-point analysis which re- volves around the recently derived Kármán-Howarth-Monin-Hill equation (KHMH). This equation is the inhomogeneous/
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3

Ahmed, Umair. "Flame turbulence interaction in premixed turbulent combustion." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/flame-turbulence-interaction-in-premixed-turbulent-combustion(f23c7263-df3d-41fa-90ed-41735fcaa34a).html.

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4

Rind, Elad. "Turbulent wakes in turbulent streams." Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/193955/.

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Direct numerical simulation and wind tunnel experiments have been used to study the effects of free-stream turbulence on axisymmetric wakes. In both cases the wake was introduced to various turbulent streams having various levels of turbulence intensity and length scales. It was found that the presence of the free-stream turbulence changes the wake’s decay rate and does not allow self-similarity to occur (unless maybe very far downstream and way beyond the current measurements reached). Also, the free-stream turbulence was found to be causing a significant transformation in the turbulence stru
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5

Vosskuhle, Michel. "Particle collisions in turbulent flows." Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2013. http://tel.archives-ouvertes.fr/tel-00946618.

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Cette thèse est consacrée au mécanisme conduisant à des taux de collisions importants dans les suspensions turbulentes de particules inertielles. Le travail a été effectué en suivant numériquement des particules, par simulations directes des équations de Navier-Stokes, et également par étude de modèles simplifiés. Les applications de ce domaine sont nombreuses aussi bien dans un contexte industriel que naturel (astrophysique, géophysique). L'approximation des collisions fantômes (ACF), souvent utilisée pour déterminer les taux de collision numériquement, consiste à compter dans une simulation,
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6

Er, Sarp. "Structure interne, transfert turbulent et propriétés de cascade de l'interface turbulent/non-turbulent d'un jet turbulent." Electronic Thesis or Diss., Université de Lille (2022-....), 2023. http://www.theses.fr/2023ULILN048.

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L'interface turbulent/non-turbulent (TNTI) est une couche très fine entre les régions turbulentes et non turbulentes de l'écoulement. Cette étude vise à mieux comprendre le bilan d'énergie cinétique au voisinage de l'interface turbulent/non-turbulent. L'équation de Kármán-Howarth-Monin-Hill (KHMH) est utilisée pour caractériser le bilan énergétique cinétique local, y compris les transferts d'énergie dans l'espace et entre les échelles. L'analyse est effectuée à l'aide de données obtenues par simulation numérique directe (DNS) finement résolue d'un jet plan turbulent se développant avec le temp
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7

Sanderson, V. E. "Turbulence modelling of turbulent buoyant jets and compartment fires." Thesis, Cranfield University, 2001. http://hdl.handle.net/1826/137.

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Turbulent buoyant jets are a major feature in fire hazards. The solution of the Reynolds Averaged Navier-Stokes (RANS) equations through computational fluid dynamic (CFD) techniques allow such flows to be simulated. The use of Reynolds averaging requires an empirical model to close the set of equations, this is known as the turbulence model. This thesis undertakes to investigate linear and nonlinear approaches to turbulence modelling and to apply the knowledge gained to the simulation of compartment fires. The principle contribution of this work is the reanalysis of the standard k- ε turbulenc
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8

Khorsandi, Babak. "Effect of background turbulence on an axisymmetric turbulent jet." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=104661.

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The effect of background turbulence on a turbulent jet was investigated experimentally. The primary objective of this work was to study the effect of different levels of the background turbulence on the dynamics and mixing of an axisymmetric turbulent jet at different Reynolds numbers. The secondary objective, which arose during the experiments, was to improve the acoustic Doppler velocimetry measurements which were found to be inaccurate when measuring turbulence statistics. In addition to acoustic Doppler velocimetry (ADV), flying hot-film anemometry was employed in this study. To move the h
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9

Irvine, Mark Rankin. "Turbulence and turbulent transport above and within coniferous forests." Thesis, University of Liverpool, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240324.

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10

Mergheni, Mohamed Ali. "Interactions particules - turbulence dans un jet axisymétrique diphasique turbulent." Rouen, 2008. http://www.theses.fr/2008ROUES067.

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Ce travail de thèse s'inscrit dans le cadre des études sur les écoulements turbulents gaz-solide et porte sur une étude numérique et une étude expérimentale de jets ronds coaxiaux diphasiques où le rapport des vitesses entre les jets externe et interne est supérieur et inférieur à un. Le but est de contribuer à la caractérisation des interactions entre la phase porteuse gazeuse et la phase dispersée et leur effet sur la modification de l'écoulement porteur. Le premier travail s'appuie sur une simulation de type Eulérienne / Lagrangienne qui résout les équations moyennées de Navier Stokes par l
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11

Cocconi, Giacomo. "Numerical investigation of turbulent/non-turbulent interface." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/5237/.

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The subject of this work is the diffusion of turbulence in a non-turbulent flow. Such phenomenon can be found in almost every practical case of turbulent flow: all types of shear flows (wakes, jet, boundary layers) present some boundary between turbulence and the non-turbulent surround; all transients from a laminar flow to turbulence must account for turbulent diffusion; mixing of flows often involve the injection of a turbulent solution in a non-turbulent fluid. The mechanism of what Phillips defined as “the erosion by turbulence of the underlying non-turbulent flow”, is called entrainment.
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12

Louch, Derek Stanley. "Vorticity and turbulent transport in premixed turbulent combustion." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.625005.

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13

Donzis, Diego Aaron. "Scaling of turbulence and turbulent mixing using Terascale numerical simulations." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19794.

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Fundamental aspects of turbulence and turbulent mixing are investigated using direct numerical simulations (DNS) of stationary isotropic turbulence, with Taylor-scale Reynolds numbers ranging from 8 to 650 and Schmidt numbers from 1/8 to 1024. The primary emphasis is on important scaling issues that arise in the study of intermittency, mixing and turbulence under solid-body rotation. Simulations up to 2048^3 in size have been performed using large resource allocations on Terascale computers at leading supercomputing centers. Substantial efforts in algorithmic development have also been unde
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14

Keshava, Iyer Kartik P. "Studies of turbulence structure and turbulent mixing using petascale computing." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/52260.

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A large direct numerical simulation database spanning a wide range of Reynolds and Schmidt number is used to examine fundamental laws governing passive scalar mixing and turbulence structure. Efficient parallel algorithms have been developed to calculate quantities useful in examining the Kolmogorov small-scale phenomenology. These new algorithms are used to analyze data sets with Taylor scale Reynolds numbers as high as 650 with grid-spacing as small as the Kolmogrov length scale. Direct numerical simulation codes using pseudo-spectral methods typically use transpose based three-dimensional (
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15

Islam, Asiful. "An Implicit Hybrid Turbulence Model for Wall-Bounded Turbulent Aerodynamics." Thesis, The University of Sydney, 2019. https://hdl.handle.net/2123/21285.

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Resolving the small-scale streaks in viscous boundary layers require excessively refined, isotropic grids beyond the capability of all but the most powerful supercomputing facilities. This thesis contributes to the widespread effort in developing hybrid turbulence closures, which aim to reduce near-wall resolution requirements yet maintain turbulence-resolving capability in free-shear flow regions. This thesis evaluated the performance of an Implicit Large-Eddy Simulation (ILES) approach implemented within a very high-order accurate framework for a structured finite-volume, compressible solve
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16

Desjonqueres, Philippe. "Modélisation lagrangienne du comportement de particules discrètes en écoulement turbulent." Rouen, 1987. http://www.theses.fr/1987ROUES004.

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17

Sciacovelli, Luca. "Simulation numérique d'écoulements turbulents de gaz dense." Thesis, Paris, ENSAM, 2016. http://www.theses.fr/2016ENAM0061/document.

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Les écoulements turbulents de gaz denses, qui sont d’un grand intérêt pour un large éventail d'applications, sont le siège de phénomènes physiques encore peu connus et difficiles à étudier par des approches expérimentale. Dans ce travail, nous étudions pour la première fois l’influence des effets de gaz denses sur la structure de la turbulence compressible à l’aide de simulations numériques. Le fluide considéré est le PP11, un fluorocarbure lourd, dont le comportement thermodynamique a été représenté à l’aide de différentes lois d’état, afin de quantifier la sensibilité des solutions aux choix
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18

Bernard, Donald Edward. "Optimization of Turbulent Prandtl Number in Turbulent, Wall Bounded Flows." ScholarWorks @ UVM, 2018. https://scholarworks.uvm.edu/graddis/824.

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After nearly 50 years of development, Computational Fluid Dynamics (CFD) has become an indispensable component of research, forecasting, design, prototyping and testing for a very broad spectrum of fields including geophysics, and most engineering fields (mechanical, aerospace, biomedical, chemical and civil engineering). The fastest and most affordable CFD approach, called Reynolds-Average-Navier-Stokes (RANS) can predict the drag around a car in just a few minutes of simulation. This feat is possible thanks to simplifying assumptions, semi-empirical models and empirical models that render th
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19

Seshasayanan, Kannabiran. "Rotating turbulent dynamos." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066158/document.

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Dans cette thèse, nous étudions l’effet de la turbulence en rotation sur l’instabilité dynamo. Nous étudions les différentes limites de la turbulence en rotation numériquement et théoriquement. D’abord, nous avons considéré l’effet dynamo engendré par les écoulements quasi-bidimensionnel (un écoulement avec trois composantes de vitesse qui dépendent de deux directions), qui modélise la limite de rotation très rapide. Nous avons étudié l’amplitude de saturation du champ magnétique en fonction du nombre de Prandt magnétique pour ce type d’écoulement. Un modèle théorique est développé et comparé
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20

McIlhenny, Julia F. "Artificial turbulent bursts." Link to electronic thesis, 2002. http://www.wpi.edu/Pubs/ETD/Available/etd-0110102-201212.

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21

Ramesh, Chandra D. S. "Turbulent Mixed Convection." Thesis, Indian Institute of Science, 2000. https://etd.iisc.ac.in/handle/2005/236.

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Turbulent mixed convection is a complicated flow where the buoyancy and shear forces compete with each other in affecting the flow dynamics. This thesis deals with the near wall dynamics in a turbulent mixed convection flow over an isothermal horizontal heated plate. We distinguish between two types of mixed convection ; low-speed mixed convection (LSM) and high-speed mixed convection (HSM). In LSM the entire boundary layer, including the near-wall region, is dominated by buoyancy; in HSM the near-wall region, is dominated by shear and the outer region by buoyancy. We show that the value of th
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22

Ramesh, Chandra D. S. "Turbulent Mixed Convection." Thesis, Indian Institute of Science, 2000. http://hdl.handle.net/2005/236.

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Turbulent mixed convection is a complicated flow where the buoyancy and shear forces compete with each other in affecting the flow dynamics. This thesis deals with the near wall dynamics in a turbulent mixed convection flow over an isothermal horizontal heated plate. We distinguish between two types of mixed convection ; low-speed mixed convection (LSM) and high-speed mixed convection (HSM). In LSM the entire boundary layer, including the near-wall region, is dominated by buoyancy; in HSM the near-wall region, is dominated by shear and the outer region by buoyancy. We show that the value of th
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23

CABRIT, BERTRAND. "Diffusion collective de la lumiere par un gaz turbulent : dispersion moleculaire et turbulente." Paris 6, 1992. http://www.theses.fr/1992PA066427.

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La lumiere diffusee par un fluide est mesuree a l'aide d'un spectrometre a melange optique de tres bonne resolution spectrale. Les conditions experimentales sont telles que les longueurs d'onde analysees sont tres grandes devant le libre parcours moyen des molecules. Dans ce cas, le spectre frequentiel du champ electrique de l'onde optique diffusee est caracteristique des fluctuations de la densite du fluide (modes hydrodynamiques). Les milieux observes sont des gaz turbulents (jet d'air, couche de melange supersonique, plasma). Ces ecoulements diffusent fortement la lumiere. La section effica
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24

MacAulay, Phillip N. "An investigation of structure in a turbulent boundary layer developing on a smooth wall." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/30002.

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The structure of a stable smooth wall zero pressure gradient turbulent boundary layer is investigated experimentally in order to determine the dominant outer region structure and to develop a hypothetical generalized boundary layer flow model. Three hot wire configurations, two vertically separated X-wires and a leading straight wire, a horizontal rake of 5 straight wires, and a vertical rake of 5 straight wires were used in the experiments, conducted at Reɵ = 8200. The basis for data reduction procedures came from crosscorrelations and the Variable Interval Time Average (VITA) technique. Th
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25

Onokpe, Oghenekevwe Owin. "Numerical investigation of turbulent hydrogen/air diffusion flames and turbulence radiation interactions." Thesis, Heriot-Watt University, 2011. http://hdl.handle.net/10399/2448.

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An investigation of the flame structure and radiation properties of turbulent hydrogen/air diffusion flames is reported. The laminar flamelet-conserved scalar probability density function approach is used to predict the scalar distributions throughout a laboratory-scale axisymmetric buoyant hydrogen diffusion flame. Predictions are compared with published measurements of mean and root mean square (RMS) temperatures and species concentrations based on the laminar flamelet concept. Predictions of spectral intensity and received heat flux are made with a narrow-band radiation model using mean pro
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26

Dallas, Vassilios. "Multiscale structure of turbulent channel flow and polymer, dynamics in viscoelastic turbulence." Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/5855.

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This thesis focuses on two important issues in turbulence theory of wall-bounded flows. One is the recent debate on the form of the mean velocity profile (is it a log-law or a power-law with very weak power exponent?) and on its scalings with Reynolds number. In particular, this study relates the mean flow profile of the turbulent channel flow with the underlying topological structure of the fluctuating velocity field through the concept of critical points, a dynamical systems concept that is a natural way to quantify the multiscale structure of turbulence. This connection gives a new phenomen
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27

Wu, Jiunn-Chi. "A study of unsteady turbulent flow past airfoils." Diss., Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/13091.

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28

Laenen, François. "Modulation de mélange, transport et turbulence dans des suspensions solides : étude et modélisation." Thesis, Université Côte d'Azur (ComUE), 2017. http://www.theses.fr/2017AZUR4010/document.

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Le transport de particules par des écoulements turbulents est un phénomène présent dans de nombreux écoulements naturels et industriels, tels que la dispersion de polluants dans l'atmosphère ou du phytoplancton et plastiques dans et à la surface des océans. Les modèles prédictifs classiques ne peuvent prévoir avec précision la formation de larges fluctuations de concentrations. La première partie de cette thèse concerne une étude de la dispersion turbulente de traceurs émis à partir d'une source ponctuelle et continue. Les fluctuations spatiales de masse sont déterminées en fonction de la dist
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29

COHEN, JACOB. "INSTABILITIES IN TURBULENT FREE SHEAR FLOWS." Diss., The University of Arizona, 1986. http://hdl.handle.net/10150/188143.

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The evolution of the large scale structures and the mean field were investigated in axisymmetric and plane mixing layers. Some aspects of the linear instability of an axisymmetric jet have been demonstrated. The axisymmetric geometry admits two additional length scales with relation to the two-dimensional shear layer: the radius of the jet column and the azimuthal wavelength. The importance of these two length scales in governing the instability of an axisymmetric jet was explored. The special case of a thin axisymmetric shear layer was analyzed and the results stressing the evolution of diffe
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30

Ünsal, Bülent. "Time-dependent laminar, transitional and turbulent pipe flows = Zeitabhängige laminare, transitionale und turbulente Rohrströmungen." kostenfrei, 2008. http://d-nb.info/990023168/34.

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31

Gerbi, Gregory Peter. "Observations of turbulent fluxes and turbulence dynamics in the ocean surface boundary layer." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/45778.

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Thesis (Ph. D.)--Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2008.<br>Includes bibliographical references (p. 110-119).<br>This study presents observations of turbulence dynamics made during the low winds portion of the Coupled Boundary Layers and Air-Sea Transfer experiment (CBLAST-Low). Observations were made of turbulent fluxes, turbulent kinetic energy, and the length scales of flux-carrying and energy-containing eddies in the o
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32

Kishi, Tatsuro. "Scaling laws for turbulent relative dispersion in two-dimensional energy inverse-cascade turbulence." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263445.

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33

Cisse, Mamadou. "Suspensions turbulentes de particules de tailles finies : dynamique, modification collective de l'écoulement turbulent." Thesis, Nice, 2015. http://www.theses.fr/2015NICE4014/document.

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Les travaux numériques et expérimentaux de cette thèse contribuent à une meilleure compréhension de la dynamique de grosses particules dans un écoulement turbulent. Un premier volet m’a permis de quantifier leur mouvement relatif au fluide, ainsi que leur influence locale sur l’écoulement turbulent. Dans un second volet, j'ai trouvé que l'effet collectif des particules est d'atténuer l’amplitude des fluctuations turbulentes. En revanche, celles-ci n’ont pas d’influence sur les propriétés statistiques fines de l’écoulement. Aussi, ces mesures suggèrent l’existence d’une transition de phase dans
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34

Gete, Zenebe. "et-enhanced turbulent combustion." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/29969.

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A study of the squish-jet design concept in spark ignition engines, with central ignition, was conducted in a constant volume chamber. The effects of jet size, jet number and jet orientation in generating turbulence and jet enhanced turbulent combustion were investigated. Three sets of configurations with three port sizes were used in this study. The research was carried out in three stages: 1.Qualitative information was obtained from flow visualization experiments via schlieren photography at 1000 frames per second. The flow medium was air. A sequence of frames at specific time intervals wer
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35

Adams, Thomas M. "Turbulent convection in microchannels." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/19421.

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36

Kaye, Nigel Gregory. "Interaction of turbulent plumes." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323741.

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37

Asgyer, Abulkasem A. "Turbulent premixed impinging flames." Thesis, University of Manchester, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488202.

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38

Abdullatif, Tawfik A. "Turbulent diffusion impinging flames." Thesis, University of Manchester, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488402.

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39

Nokes, Roger Ian. "Problems in turbulent dispersion." Thesis, University of Canterbury. Civil Engineering, 1985. http://hdl.handle.net/10092/7711.

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Solutions to a number of turbulent dispersion problems, involving a contaminant issuing from a steady source into uniform, steady open channel flow, are presented. These problems include the two and three-dimensional dispersion of a neutrally buoyant contaminant and the two-dimensional dispersion of buoyant particles and are modelled with the diffusion equation incorporating turbulent diffusion coefficients. In order to ensure that the solutions simulate the physical processes as accurately as possible the experimentally determined logarithmic velocity profile and the theoretically deduced par
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40

Goh, Eng Yew. "Turbulent slender flow calculations." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/46316.

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41

Markides, Christos Nicolaos. "Autoignition in turbulent flows." Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613893.

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42

Rigas, Georgios. "Modelling of turbulent wakes." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/26590.

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The dynamics of the turbulent three-dimensional wake generated by an axisymmetric bluff body with blunt trailing edge are experimentally and theoretically investigated at a diameter based Reynolds number of 188,000. A detailed analysis of the base pressure measurements shows that the large scale structures of the turbulent three-dimensional wake retain the structure of the laminar instabilities observed in the transitional regimes, in a statistical sense. These persisting instabilities at the turbulent regime, are associated with spatial and temporal symmetry breaking, giving rise to spatial r
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43

Brown, A. R. "Modelling turbulent sheared convection." Thesis, University of Surrey, 1995. http://epubs.surrey.ac.uk/843794/.

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Large-eddy simulations of the atmospheric boundary layer have been performed over a range of stabilities between neutral and free convective conditions. The variation of various non-dimensionalized turbulence statistics over this stability range is presented and the results are compared with observations where possible. The robustness of the model results is also assessed by comparing those from high and low resolution simulations, and by reference to a number of additional sensitivity tests. The simulation results for the variation with stability of the mean wind and temperature profiles and
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44

Prabhudesai, Gaurav. "Fluctuations in turbulent flows." Thesis, Université Paris sciences et lettres, 2021. http://www.theses.fr/2021UPSLE001.

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Dans cette thèse, nous étudions les fluctuations de vitesse et de température dans un écoulement turbulent, et leurs implications sur la propagation d’ondes acoustiques en turbulence. La première partie est consacrée à l’étude de la génération spontanée de fluctuations de température par un écoulement turbulent. Nous démontrons que ces fluctuations de température proviennent de deux types de structures intermittentes, les filaments de vorticité et les structures dissipatives. Dans la seconde partie, nous étudions les fluctuations spatio-temporelles de la vitesse, en utilisant la fonction de co
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45

Sutton, Phil J. "Saturn's turbulent F ring." Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/18475.

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As our abilities to utilise high performance computing to theoretically probe many astrophysical systems increases, a genuine need to relate to real systems becomes ever more important. Here, Saturn s rings can be used as a nearby laboratory to investigate in real time many astrophysical processes. One such system is the narrow F ring and its interaction with its inner shepherd moon Prometheus. Through numerical modelling and direct observations of the in-situ spacecraft Cassini we find new and exciting dynamics. These might help explain some of the asymmetries witnessed in the distribution of
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46

MARCHISIO, DANIELE. "Precipitation in turbulent fluids." Doctoral thesis, Politecnico di Torino, 2002. http://hdl.handle.net/11583/2550946.

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47

Padovani, Lorenzo. "Enstrophy Analysis of a Turbulent Temporal Plume." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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The aim of the present thesis work is to analyse the enstrophy behaviour of a temporal turbulent plume. Several previous works have focused their attention on the role of vorticity or enstrophy in free shear flows, but they mainly concentrate on jets, wakes or mixing layers. The analysis is performed on a temporal turbulent plume at time t = 40 which shows a Reλ= 89. The analyses performed start from a flow general features assessment. It is retrieved that the coherent vorticity structures inside a plume can be divided in Large Vorticity Structures (LVSs) and Intense Vorticity Structures (IV
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48

黎敦楠 and Tun-nam Lai. "Turbulent transport of airborne pollutant near a low hill." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B31227491.

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49

Nguyen, Dinh Duong. "Some results on turbulent models." Thesis, Rennes 1, 2020. https://ged.univ-rennes1.fr/nuxeo/site/esupversions/c3bf8d92-25f2-4242-af95-a9625f7ab4a0.

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L'objectif de la thèse est double : d'une part la thèse propose de nouveaux modèles turbulents et leur analyse également. Plus précisément, sur la base d'une modélisation de turbulence de base, de nouvelles formes d'hypothèse de Boussinesq - qui prennent en compte la rétrodiffusion d'énergie - sont obtenues. Ensuite, des outils d'analyse fonctionnelle sont appliqués pour prouver l'existence et l'unicité de solutions faibles aux modèles proposés. D'autre part, le manuscrit donne le taux de convergence des modèles de $\alpha $-régularisation aux équations de Navier-Stokes. Plus précisément, l'er
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50

Barbu, Ioana. "Tridimensional Estimation of Turbulent Fluid Velocity." Thesis, Rennes 1, 2014. http://www.theses.fr/2014REN1S115/document.

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L'analyse du mouvement en 3 dimensions (3D) des fluides turbulents à évoluée vers un cadre nécessitant (i). un système de capteurs puissants (ii). le développement d'outils d'estimation de basse complexité (iii). des connaissances a priori issues de la physique du fluide. Des nouvelles techniques formulées dans ce contexte et s'appuyant sur le traitement d'images ont été proposées. Leur méthodologie repose sur la conjugaison du savoir propre à la communauté Vision par Ordinateur avec des modèles physiques de la dynamiques du fluide. Mais voilà, la plupart de ces procédures sont exprimées dans
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