Littérature scientifique sur le sujet « Modèles de turbulence anisotropes »
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Articles de revues sur le sujet "Modèles de turbulence anisotropes"
Bašták Ďurán, Ivan, et Pascal Marquet. « Les travaux sur la turbulence : les origines, Toucans, Cost-ES0905 et influence de l'entropie ». La Météorologie, no 112 (2021) : 079. http://dx.doi.org/10.37053/lameteorologie-2021-0023.
Texte intégralPetitot, Jean. « Modèles morphodynamiques de segmentation spatiale ». Cahiers de géographie du Québec 42, no 117 (12 avril 2005) : 335–47. http://dx.doi.org/10.7202/022761ar.
Texte intégralBillaux, Daniel, et Fabian Dedecker. « Modélisation numérique des roches et fracturation : du continu au discontinu ». Revue Française de Géotechnique, no 155 (2018) : 2. http://dx.doi.org/10.1051/geotech/2018006.
Texte intégralDesmorat, Rodrigue. « Positivité de la dissipation intrinsèque d'une classe de modèles d'endommagement anisotropes non standards ». Comptes Rendus Mécanique 334, no 10 (octobre 2006) : 587–92. http://dx.doi.org/10.1016/j.crme.2006.07.015.
Texte intégralGuyenne, Philippe, Vladimir Zakharov, Andrei Pushkarev et Frédéric Dias. « Turbulence d'ondes dans des modèles unidimensionnels ». Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics 328, no 10 (octobre 2000) : 757–62. http://dx.doi.org/10.1016/s1620-7742(00)01258-7.
Texte intégralCambron, Micheline, et André G. Roy. « Vie culturelle : la turbulence comme métaphore ». Globe 15, no 1-2 (6 mars 2013) : 201–29. http://dx.doi.org/10.7202/1014632ar.
Texte intégralCousteix, J. « Calcul des écoulements pariétaux : modèles de turbulence et méthodes numériques ». La Houille Blanche, no 7-8 (novembre 1987) : 563–68. http://dx.doi.org/10.1051/lhb/1987047.
Texte intégralHunt, Julian, et Jean Coiffier. « Lewis Fry Richardson et ses contributions aux mathématiques, à la météorologie et aux modèles de conflits - Partie I ». La Météorologie, no 119 (2022) : 042. http://dx.doi.org/10.37053/lameteorologie-2022-0083.
Texte intégralMichael, RALIJAONA Ahazia, RAKOTOVAO Ndimbinarimalala Philémon, RALIJAONA Mbolahasina Soanandrianina et RATIARISON Adolphe Andriamanga. « Simulation Numérique De La Propagation Des Vagues Franchissant Un Obstacle Et Modélisation Des Résultats Obtenus Par Réseau De Neurones Et Neuro-Flou ». International Journal of Progressive Sciences and Technologies 34, no 2 (5 octobre 2022) : 15. http://dx.doi.org/10.52155/ijpsat.v34.2.4610.
Texte intégralCaccia, J. L., V. Guénard, B. Benech, B. Campistron et P. Drobinski. « Vertical velocity and turbulence aspects during Mistral events as observed by UHF wind profilers ». Annales Geophysicae 22, no 11 (29 novembre 2004) : 3927–36. http://dx.doi.org/10.5194/angeo-22-3927-2004.
Texte intégralThèses sur le sujet "Modèles de turbulence anisotropes"
Gnanga, Honoré. « Analyse numérique d'écoulements turbulents anisotropes à l'aide de modèles non-linéaires de turbulence ». Thesis, Lille 1, 2008. http://www.theses.fr/2008LIL10057/document.
Texte intégralThe aim of this work is to predict numerically the three - dimensional turbulent flows of a Newtonian and incompressible fluid using nonlinear stress - strain models. The Explicit Algebraic Stress Models (EASM), which can take into account the anisotropy of turbulence with less CPU time and computer memory than RSM or approach DNS and LES, are adopted as a turbulence model. Among these models, we choosed Shih et al. (1995) and Craft et a1.(1996) models. These models are studied using a priori and a posteriori investigations. The study is carried out in square duct. This configuration presents a secondary flow and a significant anisotropy between the Reynolds stress components. To predict the significant viscous effects due to the wall and the corner, the damping functions are implemented. The maps of the second and third invariants in the plan of Lumley exhibited show the various states of turbulence and a good anisotropy level obtained. The mean flow field and the turbulent statistics are compared with existing numerical and experimental data for square and rectangular duct flow. The model performance is shown to be satisfactory. ln particular, the mean secondary velocity vectors and stream wise vorticity are well predicted
Campana, Lorenzo. « Modélisation stochastique de particules non sphériques en turbulence ». Thesis, Université Côte d'Azur, 2022. http://www.theses.fr/2022COAZ4019.
Texte intégralThe motion of small non- spherical particles suspended in a turbulent flow is relevant for a large variety of natural and industrial applications such as aerosol dynamics in respiration, red blood cells motion, plankton dynamics, ice in clouds, combustion, to name a few. Anisotropic particles react on turbulent flows in complex ways, which depend on a wide range of parameters (shape, inertia, fluid shear). Inertia-free particles, with size smaller than the Kolmogorov length, follow the fluid motion with an orientation generally defined by the local turbulent velocity gradient. Therefore, this thesis is focused on the dynamics of these objects in turbulence exploiting stochastic Lagrangian methods. The development of a model that can be used as predictive tool in industrial computational fluid dynamics (CFD) is highly valuable for practical applications in engineering. Models that reach an acceptable compromise between simplicity and accuracy are needed for progressing in the field of medical, environmental and industrial processes. The formulation of a stochastic orientation model is studied in two-dimensional turbulent flow with homogeneous shear, where results are compared with direct numerical simulations (DNS). Finding analytical results, scrutinising the effect of the anisotropies when they are included in the model, and extending the notion of rotational dynamics in the stochastic framework, are subjects addressed in our work. Analytical results give a reasonable qualitative response, even if the diffusion model is not designed to reproduce the non-Gaussian features of the DNS experiments. The extension to the three-dimensional case showed that the implementation of efficient numerical schemes in 3D models is far from straightforward. The introduction of a numerical scheme with the capability to preserve the dynamics at reasonable computational costs has been devised and the convergence analysed. A scheme of splitting decomposition of the stochastic differential equations (SDE) has been developed to overcome the typical instability problems of the Euler–Maruyama method, obtaining a mean-square convergence of order 1/2 and a weakly convergence of order 1, as expected. Finally, model and numerical scheme have been implemented in an industrial CFD code (Code_Saturne) and used to study the orientational and rotational behaviour of anisotropic inertia-free particles in an applicative prototype of inhomogeneous turbulence, i.e. a turbulent channel flow. This real application has faced two issues of the modelling: the numerical implementation in an industrial code, and whether and to which extent the model is able to reproduce the DNS experiments. The stochastic Lagrangian model for the orientation in the CFD code reproduces with some limits the orientation and rotation statistics of the DNS. The results of this study allows to predict the orientation and rotation of aspherical particles, giving new insight into the prediction of large scale motions both, in two-dimensional space, of interest for geophysical flows, and in three-dimensional industrial applications
El, Amraoui Rachid. « Etude de modèles de turbulence pour application aux écoulements à masse volumique variable avec et sans combustion ». Rouen, 1993. http://www.theses.fr/1993ROUES029.
Texte intégralAupoix, Bertrand. « Application de modèles dans l'espace spectral à d'autres niveaux de fermeture en turbulence homogène ». Lyon 1, 1987. http://www.theses.fr/1987LYO10044.
Texte intégralBentaleb, Yacine. « Modélisation et simulation numérique de la turbulence par des approches statistiques bas-Reynolds et hybride Rans/Les ». Pau, 2007. http://www.theses.fr/2007PAUU3028.
Texte intégralThe work presented in this thesis concerns the turbulence modelling and numerical prediction of high Reynolds number flows by performing the integration of the governing equations up to the wall. The main objective is to reconsider existing turbulence models, using recent numerical tools, in order to obtain more accurate results on unstructured meshes, particularly in the near-wall region. In the perspective of hybridisation with a LES approach, we study first a linear low-Reynolds k-ε model. Then, we compare it with a cubic eddy-viscosity model, which allows accounting for anisotropy effect. The compressible Navier-Stokes solver uses an implicit unsteady mixed finite element/volume method. In two steady flow cases (turbulent channel and backward-facing step flows), we obtain satisfactory results with the linear model, whereas the nonlinear extension shows a substantial sensitivity to the eddy-viscosity parameter Cµ. In the unsteady flow (circular cylinder), the nonlinear model shows higher performances. Next, we propose a novel combination of RANS and LES approaches. The basic idea is to solve the averaged flow field by the RANS equations, and to correct it by adding the remaining resolved fluctuations with VMS (Variational Multi-Scale) approach of LES. The correction term is damped by a smooth blending function across the computational domain. The obtained model is applied to a three-dimensional flow past a circular cylinder with turbulent separation. We analyse the different flow regions and the flow topology. The statistics computed from numerical simulations are consistent with the experimental data and the hybrid approach of DES-type
Alam, Boulos. « Modélisation numérique de la turbulence et de la dispersion atmosphérique par faibles vents en milieu urbain ». Electronic Thesis or Diss., université Paris-Saclay, 2023. https://www.biblio.univ-evry.fr/theses/2023/interne/2023UPAST179.pdf.
Texte intégralThis thesis is situated in the context of atmospheric dispersion modeling, particularly in the presence of low winds. Atmospheric pollution sources, often located near the ground and influenced by complex obstacles, generate high concentrations of pollutants nearby, resulting in significant concentration fluctuations. Low winds, typically associated with stable atmospheric conditions, pose a specific challenge in modeling pollutant dispersion, requiring a thorough analysis of meteorological data and adaptation of prediction models. To address this complex challenge, the use of Computational Fluid Dynamics (CFD) is necessary, although further research is needed to validate its effectiveness in the near-field and in the presence of low winds. The Code_Saturne® software (EDF R&D) is selected due to its proven efficiency in simulating atmospheric pollutant dispersion. This thesis is divided into three distinct phases : the first phase focuses on the fundamentals of atmospheric dispersion, exploring the impact of various parameters such as the atmospheric boundary layer structure, atmospheric turbulence, and atmospheric stability. These elements play a crucial role in how pollutants disperse in the air. The second phase details the methodology used in Code_Saturne for conducting simulations, including the turbulence models employed and the criteria for evaluating these models. In addition to traditional isotropic models, this research investigates the use of anisotropic turbulence models to study dispersion in various contexts. The third phase of the thesis concentrates on the evaluation of different turbulence models and velocity-scalar correlations using observations conducted in urban environments under neutral and stable atmospheric conditions. Finally, the last phase of the research explores conditions of low and stable winds, typically characterized by wind speeds below 2 m/s and random wind variations. This phase examines the meandering patterns in pollutant dispersion and assesses the limitations of analytical and CFD models in predicting concentration in such conditions. To this end, a URANS model is developed and evaluated. Ultimately, a segmented Gaussian method is devised to compare the results with CFD predictions and field observations
Loyau, Hugues. « Etude numérique et modélisation algébrique des phénomènes d'anisotropie en turbulence statistique ». Rouen, 1996. http://www.theses.fr/1996ROUES067.
Texte intégralChang, Ze Zhou. « Etude de collisions interparticulaires en écoulement turbulent isotrope ou anisotrope par une approche lagrangienne à plusieurs trajectoires simultanées ». Rouen, 1998. http://www.theses.fr/1998ROUES008.
Texte intégralYahyaoui, Omar El. « Évaluation de modèles non-linéaires de turbulence à partir de simulations numériques directes des équations de Navier-Stokes ». Lille 1, 2003. https://ori-nuxeo.univ-lille1.fr/nuxeo/site/esupversions/b805d85e-4438-419e-b3c7-3b4549924063.
Texte intégralBelme, Anca. « Aérodynamique instationnaire et méthode adjointe ». Nice, 2011. http://www.theses.fr/2011NICE4071.
Texte intégralIn this thesis, we first focused on error estimates for unsteady problems. We have contributed to both a posteriori and a priori error estimators for unsteady inviscid problems and viscous unsteady problems. For the first one, we have been interested on linearized methods for reducing dissipation errors. Regarding the a priori errors, a new estimator is proposed with application to viscous compressible flows. These a priori estimators have been employed for goal-oriented anisotropic mesh adaptation problems, for both Euler and laminar Navier-Stokes flows, in a joint work with Gamma3 team we have developed a method to derive an optimal mesh to observe/improve a given output functional in an unsteady context. The weights of the interpolation error are adjoint states in this case. A new global fixed-point algorithm is proposed herein order to converge the couple mesh/solution. We have applied this algorithm for blast wave problems and acoustics, for both 2D and 3D cases
Livres sur le sujet "Modèles de turbulence anisotropes"
L, Dwoyer Douglas, Hussaini M. Yousuff et Voigt Robert G, dir. Theoretical approaches to turbulence. New York : Springer-Verlag, 1985.
Trouver le texte intégralMohammadi, B. Analysis of the K-epsilon turbulence model. Chichester : Wiley, 1993.
Trouver le texte intégralSagaut, Pierre, Thien-Hiep Lê et Michel Deville. Turbulence and Interactions : Proceedings the TI 2009 Conference. Berlin : Springer Verlag, 2010.
Trouver le texte intégralYoshizawa, Akira. Plasma and fluid turbulence : Theory and modelling. Bristol : Institute of Physics Pub., 2003.
Trouver le texte intégralB, Gatski T., Hussaini M. Yousuff et Lumley John L. 1930-, dir. Simulation and modeling of turbulent flows. New York : Oxford University Press, 1996.
Trouver le texte intégralCarlo, Gualtieri, et Mihailovic Dragutin T, dir. Fluid mechanics of environmental interfaces. London : Taylor & Francis, 2008.
Trouver le texte intégralJiang, Xi. Numerical techniques for direct and large-eddy simulations. Boca Raton : Taylor & Francis, 2009.
Trouver le texte intégralW, Shyy, dir. Computational techniques for complex transport phenomena. Cambridge : Cambridge University Press, 1997.
Trouver le texte intégralGatski, Thomas B., et Jean-Paul Bonnet. Compressibility, Turbulence and High Speed Flow. Elsevier Science & Technology Books, 2013.
Trouver le texte intégralGatski, Thomas B., et Jean-Paul Bonnet. Compressibility, Turbulence and High Speed Flow. Elsevier Science & Technology Books, 2013.
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