Tesis sobre el tema "Ecoulement en couche limite"
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LACASSIN, GERALD. "Etude d'une interaction tridimensionnelle onde de choc/couche limite turbulente en ecoulement supersonique". Paris 6, 1995. http://www.theses.fr/1995PA066131.
Texto completoTanière, Anne. "Comportement de particules solides au sein d'une couche limite turbulente". Valenciennes, 1996. https://ged.uphf.fr/nuxeo/site/esupversions/cbb40afa-4540-4418-9ba5-d75c8e0e8fcd.
Texto completoBoutouili, Mohieddine. "Etude statistique expérimentale d'une combustion turbulente en couche limite". Poitiers, 1988. http://www.theses.fr/1988POIT2336.
Texto completoAtmani, Rachid. "Contribution à l'étude de la couche limite tridimensionnelle et de son décollement autour des corps fuselés". Valenciennes, 1995. https://ged.uphf.fr/nuxeo/site/esupversions/5e9b921c-607f-4c89-9287-62078c863606.
Texto completoMeunier, Michel-Ange. "Envol et transport de particules en couche limité turbulente instationnaire". Valenciennes, 1999. https://ged.uphf.fr/nuxeo/site/esupversions/88ecdd6d-74f4-4c5e-a2d5-6fc59a13271b.
Texto completoThis experimental study deals with particles laden wind generated above piles of materials in steelworks sites. Especially, unsteady aspect of the flow is taken into account. Take-off and transport processes are connected with turbulent fluctuations which result of coherent structures in the near wall region. Gust analysis shows predominance of low frequencies in the energy spectrum. Hot wires gauges are used in a pulsating wind channel (frequency from 0. 1 to 0. 5 Hz) in order to measure the 2nd, 3rd or 4th mode, results are in good agreement with literature. ʪ+ is the main parameter to characterize pulsating flows. For ʪ+ values from 109 to 213, turbulence reacts in the same way as reported in others studies but with different ranges. Moreover, turbulence characteristics measured from static wall jauge are the same as those obtained with jauge mounted on a traversing mechanism. Spherical particles laden flow shows a saltation process. Experimental investigations consist on images processing and weighting method. In stationary mode, mass flux and slope of particles concentration profiles are in good agreement with literature. According to velocities values, a temporal decay of the two previous parameters is observed. Particles velocities profiles are determined by cross-correlation processing. In pulsating flow, mass flux mean values decrease, which could be attributed to the phase shift between solid and fluid phases. This behaviour seems to depend on the ratio of characteristic times of both phases. Moments of the longitudinal wall shear stress and velocity fluctuations. In stationary stationary mode, mass flux and slope of particles concentration profiles are in good agreement with literature. According to velocities values, a temporal decay of the two previous parameters is observed. Particles velocities profiles are determined by cross-correlation processing. In pulsating flow, mass flux mean values decrease, which could be attributed to the phase shift between solid and fluid phases. This behaviour seems to depend on the ratio of characteristic times of both phases
Bur, Reynald. "Etude fondamentale sur le controle passif de l'interaction onde de choc/couche limite turbulente en ecoulement transsonique". Paris 6, 1991. http://www.theses.fr/1991PA066053.
Texto completoPetit, Pascal. "Ecoulement produit par une rangée de jets inclinés débouchant dans une couche limite turbulente ; application au refroidissement". Poitiers, 1996. http://www.theses.fr/1996POIT2344.
Texto completoBenhalima, Reda Bachir. "Contribution à l'étude de la couche limite laminaire tridimensionnelle autour d'un corps de révolution en vibrations harmoniques". Valenciennes, 1996. https://ged.uphf.fr/nuxeo/site/esupversions/fca1e588-6ef6-4e1b-86e6-3c672e09ad49.
Texto completoArnoux, Joël. "Champ turbulent d'une couche limite tridimensionnelle sur paroi mobile". Aix-Marseille 2, 1986. http://www.theses.fr/1986AIX22024.
Texto completoMasmoudi, Mohamed. "Etudes des proprietes physiques d'un ecoulement dans la couche limite atmospherique sur un terrain complexe au cours de l'experience mesogers-84". Paris 6, 1988. http://www.theses.fr/1988PA066403.
Texto completoMartel, Emmanuel de. "Simulation numérique des grandes échelles des interactions choc / couche limite". Paris 6, 2009. http://www.theses.fr/2009PA066285.
Texto completoKouakou, Jacques Kouamé Kan. "INSTABILITES DES INTERFACES ECOULEMENT / FOND ERODABLE : APPROCHES ASYMPTOTIQUES". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2005. http://tel.archives-ouvertes.fr/tel-00011485.
Texto completoLémery, Cédric. "Convection et couche limite thermique: lien entre la convection du manteau terrestre et la dynamique de la lithosphère". Lyon, École normale supérieure (sciences), 2001. http://www.theses.fr/2001ENSL0206.
Texto completoSolakoglu, Erhan. "Modélisation des écoulements compressibles turbulents. Interaction onde de choc/couche limite turbulente". Rouen, 1994. http://www.theses.fr/1994ROUES023.
Texto completoIlly, Hervé. "Contrôle de l'écoulement au-dessus d'une cavité en régime transsonique". Ecully, Ecole centrale de Lyon, 2005. http://bibli.ec-lyon.fr/exl-doc/hilly.pdf.
Texto completoThe impingement of a flow upon a wall results in a sound that industrials want to remove because the level of acoustic energy, although it represents only a weak part of the total energy, may affect the material integrity or cause a prejudicial noise pollution. In particular, suppression of the low frequency narrow-band sound (discrete tones) of high amplitude produced by the flow over a cavity is an important challenge, as shown y the numerous studies dedicated to this subject over the last six decades. This study aims at controlling or suppressing the self-sustained oscillations responsible for the generation of acoustic waves in this flow. However, despite the apparent simplicity of the phenomena, knowledge of the physical mechanisms involved remains limites, making the control approach still difficult to carry out. As control is dependent on the knowledge of the physics of the flow, the influence of the upstream conditions in highly subsonic flows as been investigated. A local aspiration of the boundary layer is carried out by a narrow split upstream of the cavity. Unsteady pressure measurements show that, over the range of parameters under consideration, the diminution of the boundary layer thickness does not induce any significant change in the flow
Keirsbulck, Laurent. "Etude des structures de la turbulence en écoulement de type couche limite sur parois lisse et rugueuse". Valenciennes, 2000. https://ged.uphf.fr/nuxeo/site/esupversions/2811b9bf-bd46-45c9-b2e4-10110978e9b8.
Texto completoCoundoul, Falilou. "Étude et modélisation des transferts verticaux dans l'interaction biofilm de rivière/couche limite turbulente". Phd thesis, Toulouse, INPT, 2012. http://oatao.univ-toulouse.fr/9268/1/coundoul_partie_1_sur_3.pdf.
Texto completoBouaouina, Lalouani. "Etude du décollement et du contrôle de la couche limite laminaire tridimensionnelle autour d’un corps fuselé en incidence". Valenciennes, 2000. https://ged.uphf.fr/nuxeo/site/esupversions/cc6b2971-4ebd-43a3-8247-edf3b89c467a.
Texto completoSpohn, Andreas. "Ecoulement et éclatement tourbillonnaires engendrés par un disque tournant dans une enceinte cylindrique". Grenoble 1, 1991. http://www.theses.fr/1991GRE10037.
Texto completoPlantie, Laurent. "Le probleme de la couche interne des ecoulements asymptotiques de type triple couche : modele, analyse et simulations numeriques". Toulouse 3, 1997. http://www.theses.fr/1997TOU30205.
Texto completoBerrabaa, Sabeur. "Ecoulements turbulents stratifiés et simulation des grandes échelles". Toulon, 2002. http://www.theses.fr/2002TOUL0002.
Texto completoHarion, Jean-Luc. "Influence de différences de densité importantes sur les propriétés de transfert d'une couche limite turbulente". Grenoble INPG, 1994. http://www.theses.fr/1994INPG0133.
Texto completoRenaud, Thomas. "Simulation numérique du tremblement autour de profils d'aile en régime transsonique". Paris, ENSAM, 2001. http://www.theses.fr/2001ENAM0027.
Texto completoDa, Costa Paulo. "Application de la distorsion rapide à des écoulements turbulents instationnaires". Université Joseph Fourier (Grenoble), 2000. http://www.theses.fr/2000GRE10139.
Texto completoPenin, Veronique. "Interactions rotor-stator en turbine : étude de l'effet potentiel remontant". Phd thesis, Ecole Centrale de Lyon, 2011. http://tel.archives-ouvertes.fr/tel-00679727.
Texto completoFlorens, Emma. "Couche limite turbulente dans les écoulements à surface libre : étude expérimentale d'effets de macro-rugosités". Toulouse 3, 2010. http://thesesups.ups-tlse.fr/1285/.
Texto completoIn the case of turbulent rough flows, according to the wall boundary layers theory, the boundary layer is composed of three sublayers : the outer layer, the roughness sublayer and an overlap between the two sublayers. Under the assumption of invariance under the transverse direction, and for ratios h/D low (h roughness height, D water depth), the theory predicts that the longitudinal mean velocity profile follows a logarithmic law in the overlap layer. This log-law provides access to the wall parameters, as the roughness length z0, and can also estimate the coefficient of friction necessary to close the St Venant equations vertically integrated. However, in presence of macro-roughnesses, i. E. For h/D important, or in presence of a inhomogeneous rough bed, the question of the logarithmic law validity arises. An experimental study of two macro-roughnesses effects has been made : the confinement effect and the transverse variation of macro-roughnesses effect. The regimen were generated in a large open-channel (20m x 1. 1mx 0. 5m), and macro-rough beds were made with 20 mm plastic cubes. 2D PIV technique was used. New measurement technologies, such as BK7 glass cubes, were used to measure the velocity field between the roughness elements with high spatial resolution. In the case of homogeneous rough bed, it was revealed that the similarity of the outer layer is observed for confinement numbers h/D < 0. 33. For strong confinement (h/D > 0. 15), the friction velocity u*, related to the intensity of friction generated at the wall, is no longer the characteristic scale of the flow velocity. In the case of flows over inhomogeneous rough bed, a preliminary study was made to observe the effect of secondary currents generated by the change of roughness on the outer layer similarity
Marsan, Aurélien. "Analyse et contrôle des écoulements en compresseur centrifuge avec diffuseur aspiré". Phd thesis, Ecole Centrale de Lyon, 2013. http://tel.archives-ouvertes.fr/tel-00965080.
Texto completoSadek, Radi. "Modélisation de l'écoulement atmosphérique à l'échelle hectométrique". Thesis, Ecully, Ecole centrale de Lyon, 2013. http://www.theses.fr/2013ECDL0011/document.
Texto completoMany practical and industrial applications, such as the study of atmospheric dispersion of pollutants, air quality,micro-meteorology in complex terrain and wind assessment, require accurate prediction of the atmospheric flow at a so-called local scale (approximately 10 km horizontally). Therefore, the main objective in this thesis is to propose a chain of methodologies capable of simulating the atmospheric flow at this scale, with a horizontal hectometric spatial resolution. First of all, we were interested in modeling of turbulence in the atmospheric boundary layer (ABL). In addition to the largely used RANS k−ε model, we considered the use of the RANS Ri j− ε model as a way of simulating turbulence anisotropy.We were able to verify the necessity of using the Duynkerke (1988) constants in order to achieve atmospheric levels of turbulence with the k− ε model. In a similar way, we also developed a new set of atmospheric constants for the Ri j− ε model. Finally, we proposed a theoretical model capable of reproducing the main characteristics of a turbulent flow for any given sampling duration, thus allowing a more continuous approach between « standard » and « atmospheric » constants for turbulence models. Also, in this thesis, we developed the « CFD 1D-3D » modeling approach. It is based on the use of a 1D CFD model as a way of providing vertical profiles of meteorological data for boundary conditions of a 3D CFD code, used in complex terrain. This 1D model was developed as a part of the thesis, along with k− ε and Ri j − ε turbulence models. It was validated by being compared with empirical and theoretical results. The comparisons showed very encouraging results concerning the ability of this model in simulating ABL in the presence of a flat terrain. In addition, the « CFD 1D- 3D » methodology was assessed by comparison with wind tunnel measurements in the presence of complex terrain, which showed very satisfactory resultst. These comparisons also validated the newly developed set of constants for the Ri j− ε model. Finally, we studied the use of partially converged CFD as a way of reducing the CPU time of CFD simulations for operational purposes. We therefore demonstrated that we can achieve a low error solution (< 10% error compared with the converged solution), with a CPU time of about 5%−10% of the time required to achieve convergence. This result was very interesting because the methodology significantly reduces the computational time while maintaining a low error as compared to the overall uncertainty of the CFD approach
Shahab, Muhammad Farrukh. "Etude numérique de l'influence de l'impact d'une onde de choc et d'un transfert de chaleur sur une couche limite en développement". Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2011. http://www.theses.fr/2011ESMA0020.
Texto completoAs a prerequesite for relevant model development and improvement of design methodologies for supersonic vehicles, this study aims at investigating the influence of wall heat-transfer and shock interaction on the turbulence structure of supersonic boundary layers. The numerical strategy relies on the full resolution of threedimensional compressible Navier-Stokes equations by means of state-of-art high-order WENO and compact schemes. A fully-developped turbulent boundary layer is simulated by means of upstream wall perturbations triggering the transition in order to dispose of fully-reliable data upstream of the analysis region. Insipient separation conditions and two different wall thermal boundary conditions (adiabatic and cold) are considered. The analysis focuses on the evolution of mean and turbulent flow properties along the interaction region and in the relaxation region downstream of the shock-system. The strong influence of the mean pressure gradient is quantified through the analysis of mean flow profiles and boundary layer integral parameters. The anisotropic amplification of turbulent quantities through the interaction region is characterized and the turbulent events associated with the modification of the turbulence structure of the perturbed boundary layer are identified. The mean and turbulent thermal fields are shown to be strongly modified by the wall cooling which significantly dampens more particularly the turbulent thermal quantities levels across the boundary layer. In addition, a reduction of the upstream influence and separation lengths by the wall cooling are evidenced along with a faster recovery process downstream of the shock-system
Normand, Xavier. "Transition à la turbulence dans les écoulements cisaillés compressibles libres ou pariétaux". Grenoble INPG, 1990. http://www.theses.fr/1990INPG0103.
Texto completoLebret, Yann. "Etude numérique de la couche de mélange turbulente compressible". Rouen, 1993. http://www.theses.fr/1993ROUES043.
Texto completoBocquet, Sébastien. "Modélisation de paroi et injection de turbulence pariétale pour la Simulation des Grandes Echelles des écoulements aérothermiques". Phd thesis, Toulouse, INPT, 2013. http://oatao.univ-toulouse.fr/10307/1/bocquet.pdf.
Texto completoCahen, Juliette. "Modélisation de la turbulence pour la prédiction d'écoulements internes compressibles. Validation d'un modèle (k,epsilon) en configuration tridimensionnelle d'interaction onde de choc-couche limite turbulente". Rouen, 1993. http://www.theses.fr/1993ROUES022.
Texto completoDESSOLIN, JOEL. "Etude de la reduction de trainee et de la stabilite d'une couche limite laminaire sur une plaque equipee d'une serie de perturbateurs". Toulouse 3, 1998. http://www.theses.fr/1998TOU30030.
Texto completoCabrit, Olivier. "Modélisation des flux pariétaux sur les tuyères des moteurs à propergol solide". Montpellier 2, 2009. http://www.theses.fr/2009MON20239.
Texto completoThe nozzles of solid rocket motors must resist to severe wall fluxes. Carbon/carbon composite materials are then chosen to insure the structure integrity. In spite of their excellent thermo-mechanical properties, these materials are exposed to the ablation phenomenon: chemical oxidation of the solid material by the combustion products. On the one hand, this feature protects the nozzle structure since this process considerably reduces the wall heat flux. On the other hand, the ablation process must be perfectly controlled because of the geometrical changes induced by the surface recession. The assessment of mass/momentum/heat fluxes at the wall is thus a crucial part for the nozzle design. Numerical simulations are nowadays commonly used to define new nozzles. However, considering the power of the available computers, the use of wall models is a necessary step to simulate full scale devices. With this framework, one presents a set of direct numerical simulations whose analysis allows to derive new wall functions integrating several complex physical aspects that modify the "classical" behavior of the turbulent boundary layer: multicomponent reacting compressible flow, with non-unity Prandtl number, radiative transfer, streamwise pressure gradient, and wall ablation. These new models are now ready to be tested on realistic configurations
Chpoun, Amer. "Contribution a l'etude d'ecoulements hypersoniques (m=5) sur une rampe de compression en configuration 2-d et 3-d". Paris 6, 1988. http://www.theses.fr/1988PA06A005.
Texto completoDucros, Frédéric. "Simulations numériques directes et des grandes échelles de couches limites compressibles". Grenoble INPG, 1995. http://www.theses.fr/1995INPG0007.
Texto completoRossi, Lionel. "Contrôle électromagnétique d'écoulement en eau de mer". Université Joseph Fourier (Grenoble), 2001. http://www.theses.fr/2001GRE10131.
Texto completoDechaume, Antoine. "Analyse asymptotique et numérique des équations de Navier-Stokes : cas du canal indenté". Toulouse 3, 2006. http://www.theses.fr/2006TOU30023.
Texto completoThis work deals with the problems of incompressible boundary layer modeling. The strong interaction between the boundary layer and external flow is to be accounted for, which leads to the coupling of these two models. Such models can be obtained with the classical methods of singular perturbation asymptotic analysis, such as the Method of Matched Asymptotic Expansions (MMAE). The complex shape and implementation of these models, the restricted cases for which they apply, and the difficulty to obtain global approximations from local ones, are many of the drawbacks we wish to transcend. This is the reason why a new asymptotic method is used, the Successive Complementary Expansions Method (SCEM), which avoids these limitations. The SCEM is based on the assumption of the structure of a global approximation, and then infers a method of constructing this approximation. The use of generalized asymptotic expansions, contrary to the MMAE which is based on regular expansions, leads to more general and simpler models. Thanks to the SCEM, according to the physical situation, two types of models can be obtained. .
Boufermel, Abdennour. "Modélisation numérique des phénomènes non linéaires acoustiques en fluide thermovisqueux : application à l'étude des écoulements redressés et des transferts thermiques en résonateurs". Le Mans, 2010. http://cyberdoc.univ-lemans.fr/theses/2010/2010LEMA1034.pdf.
Texto completoUsually, the acoustic propagation at high levels is accompanied by nonlinear secondary phenomena. Among these phenomena, the generation of secondary flows called ‘acoustic streaming’ and the heat transfer induced by the acoustic (thermoacoustic process) are studied. Specifically, the aim of the thesis is to present and to validate a theoretical formulation suitable for numerical modeling of nonlinear phenomena from conventional calculation codes, using a minimum of approximations. The acoustic streaming and the thermoacoustic effect having large time scales compared to the acoustic period, the theoretical description is carried out on the basis of a separation of time scales: (i) calculation of the oscillating acoustic field in harmonic regime during the acoustic period, taking into account effects of thermal and viscous boundary layers, (ii) seek solutions of the conservation equations that describe the slow nonlinear phenomena, using the mass transport velocity as a variable. The use of this variable allows the equations to keep a classical form in fluid dynamics; the nonlinear effects are shown by different source terms in right hand side of these equations. This numerical modeling is applied to the study of two types of machines thermoacoustic (traveling wave machine, stationary wave machine), inside which the acoustic streaming and heat transfers, are separately analyzed. After validation on specific configurations corresponding to previous analytical studies, original results are presented, concerning especially the effect of the curvature of annular resonator on the acoustic streaming or inserting a stack of thin solid plates inside the resonator
Chpoun, Amer. "Contribution à l'étude d'écoulements hypersoniques (M=5) sur une rampe de compression en configuration 2-D et 3-D". Paris 6, 1988. http://www.theses.fr/1988PA066149.
Texto completoDebert, Sébastien. "Développement de méthodes de séparation des nombres d'onde acoustiques et convectifs en écoulements turbulents pariétaux". Phd thesis, Université de Poitiers, 2008. http://tel.archives-ouvertes.fr/tel-00693903.
Texto completoFerragh, Omar. "Etude du transfert de chaleur et de masse dans un écoulement d'air entre deux plaques parallèles en présence d'un ruissellement d'eau : Application aux réfrigérants industriels". Valenciennes, 1995. https://ged.uphf.fr/nuxeo/site/esupversions/4aad8950-0f32-46d7-9276-1f08fd498651.
Texto completoAndré, Thierry. "Contrôle actif de la transition laminaire-turbulent en écoulement hypersonique". Thesis, Orléans, 2016. http://www.theses.fr/2016ORLE2022/document.
Texto completoDuring a hypersonic flight (Mach 6, 20 km altitude), the boundary layer developing on the forebody of a vehicle is laminar. This state may destabilize the scramjet engine propelling the vehicle. To overcome this problem during the flight, the boundary layer transition has to be forced using a control device whose effect is fixed (passive) or adjustable (active). In this work, we analyze the efficiency of a jet in crossflow in forcing the boundary layer transition on a generic forebody. The flow is computed with a Large Eddy Simulations (LES) approach. A parametric study of the injection pressure allows the efficiency of the jet in tripping the boundary layer to be quantified. The influence of flight conditions (Mach, altitude) on the transition is also studied. Dynamic Mode Decomposition (DMD) is applied to the simulation results to determine the transition leading to dynamic modes and to understand underlying transition mechanisms. Experiments in the Purdue University quiet wind tunnel (BAM6QT) were performed to quantify the efficiency of a passive transition device (diamond roughnesses) and an active transition device (single air jet) in tripping the boundary layer. A thermo-sensitive paint and pressure transducers (Kulite, PCB) were used to determine the state of the boundary layer on the generic forebody. Experimental and numerical results show a sonic injection is sufficient to induce transition. We observe from the experiments that for the same penetration height, a single roughness is less efficient than a single air jet in destabilizing the boundary layer
Desvigne, Damien. "Bruit rayonné par un écoulement subsonique affleurant une cavité cylindrique : caractérisation expérimentale et simulation numérique par une approche multidomaine d'ordre élevé". Phd thesis, Ecole Centrale de Lyon, 2010. http://tel.archives-ouvertes.fr/tel-00589006.
Texto completoRouzès, Maxime. "Etude expérimentale de l'hydrodynamique d'un écoulement turbulent à surface libre sur fond rugueux à faible submersion". Phd thesis, Toulouse, INPT, 2015. http://oatao.univ-toulouse.fr/14164/1/rouzes.pdf.
Texto completoGlikson, Fabienne. "Couche limite sur paroi rugueuse". Toulouse, ENSAE, 1996. http://www.theses.fr/1996ESAE0003.
Texto completoBey, Mohamed Amine. "Modélisation mathématique et simulations numériques des écoulements sanguins dans des artères avec ou sans stents". Thesis, Sorbonne Paris Cité, 2015. http://www.theses.fr/2015USPCD027/document.
Texto completoThis thesis is devoted to mathematical modeling and numerical simulations of the blood-flows in arteries in the presence of a vascular prosthesis of type stent. The presence of stent can be considered as a local perturbation of a smooth edge of flow, more precisely the walls artery can be seen as a strongly rough surface.Weare mainly interested in controlling the H² regularity of a simplified model which takes into account the impact of these stents when the blood flow is controlled by a Laplace equation (in link with the axial component rateof flow) with a Dirichlet boundary condition, in a domain with a rough board (according to a small parameter ε). First, we raise the question of existence and unicity of the solution of this model of blood-flow and we study the H² regularity using variational analysis methods. By a detailed study, we control the H² regularity of order O(ε−1). The second part is devoted to the study of the regularity H² regularity using multi-scale analysis.We prove that the H² norm of the solution of this model is singular of order O(ε−½). Moreover, we improve the convergence rate of the existing results on the construction of the multi-scale approximation. Finally, we present an error estimation and numerical results. These numerical results illustrate the well-founded of the error estimates on a practical level. We show the importance of the asymptotic methods that seem to be more effective than a direct computation
Riva, Roland. "Ecoulements de fluides inhomogènes : stabilité des jets, transferts turbulents dans les couches limites". Grenoble INPG, 1991. http://www.theses.fr/1991INPG0102.
Texto completoChemel, Charles. "Transport et mélange en terrain complexe : application à la dynamique atmosphérique dans les vallées encaissées". Phd thesis, Grenoble 1, 2005. http://tel.archives-ouvertes.fr/tel-00011306.
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