Dissertations / Theses on the topic 'Simulation numérique en mécanique des fluides'
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Piperno, Serge. "Simulation numérique de phénomènes d'interaction fluide-structure." Phd thesis, Ecole des Ponts ParisTech, 1995. http://tel.archives-ouvertes.fr/tel-00005618.
Full textLefèbvre, Matthieu. "Algorithmes sur GPU pour la simulation numérique en mécanique des fluides." Paris 13, 2012. http://scbd-sto.univ-paris13.fr/intranet/edgalilee_th_2012_lefebvre.pdf.
Full textNumerical simulations in fluid mechanics require tremendous computational power ; GPU computing is one of the newest approaches to accelerate such simulations. On one hand, this thesis studies the case of fluid mechanics algorithms on structured meshes. The mesh structuration naturally brings well suited memory arrangements and allows to reach guidelines when using GPUs for numerical simulations. On the other hand, we examine the case of fluid mechanics on unstructured meshes with the help of three different algorithmic strategies. The first of these technique is a reorganisation to produce consecutive data accesses, but at the cost of expensive data copies, both in time and in memory. The second technique, a cell partitioning approach, is developed and allows to extensively use modern GPUs’ cache memories. The third technique consists on a generic refinement. The initial mesh is made of coarse elements refined in the exact same way in order to produce consecutive memory accesses. This approach brings significant performance improvements for fluid mechanics simulations on unstructured meshes
Bonneton, Natalie. "Simulation numérique des jets plans compressibles." Toulouse, INPT, 1993. http://www.theses.fr/1993INPT031H.
Full textDoradoux, Adrien. "Simulation numérique d’écoulements diphasiques autour d’un solide mobile." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0582/document.
Full textFictitious domain methods allow to simulate flows around complex and/or moving bodies with simple meshes. The object is "immersed" in a domain that contains fluid and solid volumes. The penalization method, which consists in adding a term in the momentum balance equation, in order to impose the solid velocity, is studied in a first part. Thanks to asymptotic expansions, the order of the error induced by this method is computed for moving bodies. This approach is then coupled with a Vector Penalty Projection scheme that permits to impose the incompressibility constraint. The convergence of the penalized scheme towards the Navier-Stokes equations is established. In a second part, an original approach, able to treat multiphase flowsis presented: the Time and Space Dependent Porosity method. The key idea is to consider the solid as a medium without mass. The discretization of the mass balance equation is modified,so that the total volume occupied by all fluid phases and the solid is equal to the total volume.This method is numerically validated on a set of various test cases including incompressible or compressible single phase flows and two-phase flows
Faucher, Eric. "Simulation numérique des écoulements unidimensionnels instationnaires avec autovaporisation." Phd thesis, Université Paris XII Val de Marne, 2000. http://tel.archives-ouvertes.fr/tel-01026372.
Full textDenel, Bertrand. "Simulation numérique et couplage de modèles thermomécaniques puits-milieux poreux." Pau, 2004. http://www.theses.fr/2004PAUU3021.
Full textIn order to interpret recorded temperatures in petroleum wellbores, and thus to better characterize reservoirs, we develop a direct model, coupling the wellbore and the reservoir at both dynamic and thermal levels. To reach this goal, we couple a reservoir model, notably including viscous dissipation and compressibility effect, with a new pseudo 1D model. The original aspect of the latter model is to derive a conform approximation from a 2D model and by this way, to take into account the privileged direction of the flow, as well as the particular geometry of the wellbore, by explicitly writing the dependency of the unknowns in the radial direction. For each model, the fluxes are approximated by conservative Raviart-Thomas elements, ensuring natural transmission conditions at the interface. An analysis of the resulting mixed formulations is carried out and the well-posedness of the semi-discretized problems is established. Then, numerical results including real study cases are presented. Finally, a global coupling approach of the two models is exposed
Basset, Olivier. "Simulation numérique d'écoulements multi-fluides sur grille de calcul." Phd thesis, École Nationale Supérieure des Mines de Paris, 2006. http://tel.archives-ouvertes.fr/tel-00376484.
Full textMichel, Bertrand. "Contribution à la simulation numérique efficace des écoulements dans les prises d'air supersoniques." Paris, ENSAM, 2004. http://www.theses.fr/2004ENAM0014.
Full textBenjeddou, Saïd. "Simulation numérique directe des gaz fortement chauffés et approximation polytropique." Aix-Marseille 2, 2003. http://www.theses.fr/2003AIX22088.
Full textBecheikh, Nidhal. "Modélisation et simulation numérique de la dégradation photocatalytique d'un polluant modèle dans un microréacteur." Thesis, Université de Lorraine, 2012. http://www.theses.fr/2012LORR0333/document.
Full textIndustrial photocatalysis applications requires further research to control and design photocatalytic reactors. The micro structuring of reactors is an innovative solution. It increases the catalytic efficiency by improving the contact of the pollutant with the catalyst. Thesis aim concerned the destruction of a model pollutant, salicylic acid, with deposited catalyst (TiO2) at the bottom of a microchannel. The research is based on experiments and simulations to predict the photocatalytic degradation for a given reactor configuration. In our experimental conditions of low flow, an axial dispersion and a concentration gradient between the catalyst surface and the reaction medium have been demonstrated. We have shown that the gradient of velocity is more pronounced in low cross section microreactors. This gradient allows the formation of recirculation zones near the catalytic surface thus creating favorable conditions for contact between the pollutant and the catalytic surface. Using numerical soft, we have simulated the reaction of photocatalytic degradation to represent our experimental results. On a one hand, the role of diffusion to the catalytic surface has been demonstrated. On the other hand, numerical simulation has allowed to establish a relationship between the Sherwood number as a function of Reynolds number, Schmidt and the hydraulic diameter of the microchannel. This relationship is used to estimate the mass transfer constant to represent correctly the photocatalytic degradation
Sun, Zhengyu. "Simulation numérique par éléments finis de l'hydrodynamique tridimensionnelle à l'intérieur des cuves agitées." Ecully, Ecole centrale de Lyon, 1989. http://www.theses.fr/1989ECDL0007.
Full textH, L. Tran. "Simulation numérique de convection naturelle d'un mélange binaire : cas d'un panache d'hélium en cavité." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2013. http://tel.archives-ouvertes.fr/tel-00920867.
Full textCastaldi, Stéphane. "Étude de la turbulence cinématiquement homogène isotrope et massiquement inhomogène par simulation numérique directe." Toulouse, INPT, 1999. http://www.theses.fr/1999INPT008H.
Full textLaporte, Florent. "Simulation numérique appliquée à la caractérisation et aux instabilités des tourbillons de sillage d'avions de transport." Toulouse, INPT, 2002. http://www.theses.fr/2002INPT003H.
Full textSalvador, Yvan. "Contribution à la simulation numérique de l'écoulement autour d'une bulle déformable." Nantes, 1994. http://www.theses.fr/1994NANT2112.
Full textFONTAINE, EMMANUEL. "Simulation de l'écoulement potentiel engendré par un corps élancé perçant la surface libre à forts nombres de Froude." Marne-la-vallée, ENPC, 1996. http://www.theses.fr/1996ENPC9608.
Full textBenjelloun, Saad. "Quelques problèmes d'écoulement multi-fluide : analyse mathématique, modélisation numérique et simulation." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2012. http://tel.archives-ouvertes.fr/tel-00764374.
Full textMoussière, Sandrine. "Etude par simulation numérique des écoulements turbulents réactifs dans les réacteurs d'oxydation hydrothermale : application à un réacteur agité double enveloppe." Aix-Marseille 3, 2006. http://www.theses.fr/2006AIX30045.
Full textSupercritical water oxidation is an innovative process to treat organic liquid waste which uses supercritical water properties to mix efficiency the oxidant and the organic compounds. The reactor is a stirred double shell reactor. In the step of adaptation to nuclear constraints, the computational fluid dynamic modeling is a good tool to know required temperature field in the reactor for safety analysis. Firstly, the CFD modeling of tubular reactor confirms the hypothesis of an incompressible fluid and the use of k-[oméga] turbulence model to represent the hydrodynamic. Moreover, the EDC model is as efficiency as the kinetic to compute the reaction rate in this reactor. Secondly, the study of turbulent flow in the double shell reactor confirms the use of 2D axisymetric geometry instead of 3D geometry to compute heat transfer. Moreover, this study reports that water-air mixing is not in single phase. The reactive turbulent flow is well represented by EDC model after adaptation of initial conditions. The reaction rate in supercritical water oxidation reactor is mainly controlled by the mixing
Mycek, Paul. "Étude numérique et expérimentale du comportement d'hydroliennes." Phd thesis, Université du Havre, 2013. http://tel.archives-ouvertes.fr/tel-00925229.
Full textLallement, Julien. "Modélisation et simulation numérique d’écoulements de films minces avec effet de mouillage partiel." Thesis, Toulouse, ISAE, 2019. http://www.theses.fr/2019ESAE0005/document.
Full textThe ice accretion on surfaces encountered in aeronautics (wings, nacelle lips, sensors)is considered as a major risk for aviation safety. The consequences observed are the degradationof the aerodynamic performances that can lead to the aircraft stall, disturbancesin the engines that can lead to flame out or clogging of the sensors. That is why aircraftmanufacturers are developing thermal protection systems against icing. The wateraccumulated on the surfaces thus remains in the liquid state and forms a thin film. Thedynamic properties (thickness, velocity and spreading) and thermal properties (temperature,evaporation rate) of the film in the presence of a sheared air flow make it possible apotential refreezing of the water film on unprotected surfaces (”runback ice” phenomena).Since flight or wind tunnel tests are generally expensive and difficult to set up, numericalsimulation has become an effective and complementary tool to design these systems. Themain purpose of this thesis is to develop a model integrated in a numerical tool to predictthe transport of liquid water on a surface which might take the form of a film, a rivulet ora droplet. An integral approach based on a shallow water type model is adopted. It makesit possible to describe the macroscopic dynamics of a three-dimensional liquid film onrealistic configurations and within reasonable computing times compared to a full Navier-Stokes computation. An extended formulation is proposed, it corresponds to a second orderdifferential system and thus allows to use arbitrary surface meshes. Contrary to modelsavailable in the literature, the one proposed in this manuscript has the advantage of takinginto account capillary and wetting phenomena without validity limit in term of staticcontact angle. An energy conservation equation ensuring the thermodynamic consistencyof the calculated solutions is derived from the extended model governing fluid dynamics.A Finite Volume discretization of the system is proposed. Numerical simulations validatethe model for both static and dynamic academical wetting configurations. The transitionof a continuous film into rivulets is also simulated
Gao, Feng. "Simulation Numérique Avancée du Décollement de Coin dans une Grille d'Aubes de Compresseur." Phd thesis, Ecole Centrale de Lyon, 2014. http://tel.archives-ouvertes.fr/tel-01068581.
Full textSciacovelli, Luca. "Simulation numérique d'écoulements turbulents de gaz dense." Thesis, Paris, ENSAM, 2016. http://www.theses.fr/2016ENAM0061/document.
Full textDense gas turbulent flows, of great interest for a wide range of engineering applications, exhibit physical phenomena that are still poorly understood and difficult to reproduce experimentally. In this work, we study for the first time the influence of dense gas effects on the structure of compressible turbulence by means of numerical simulations. The fluid considered is PP11, a heavy fluorocarbon, whose thermodynamic behavior is described by means of different equations of state to quantify the sensitivity of solutions to modelling choices. First, we considered the decay of compressible homogeneous isotropic turbulence. Temperature fluctuations are found to be negligible, whereas those of the speed of sound are large because of the strong dependence on density. The peculiar behavior of the speed of sound significantly modifies the structure of the turbulence, leading to the occurrence of expansion shocklets. The analysis of the contribution of the different structures to energy dissipation and enstrophy generation shows that, for a dense gas, high expansion regions play a role similar to high compression ones, unlike perfect gases, in which the observed behaviour is highly asymmetric. Then, we carried out numerical simulations of a supersonic turbulent channel flow for several values of Mach and Reynolds numbers. The results confirm the validity of the Morkovin' hypothesis. The introduction of a semi-local scaling, taking into account density and viscosity variations across the channel, allow to compare the wall-normal profiles of turbulent quantities (Reynolds stresses, anisotropy, energy budgets) with those observed in ideal gases. Nevertheless, the thermodynamic variables exhibit a different evolution between perfect and dense gases, since the high specific heats of the latter lead to a decoupling of dynamic and thermal effects, and to a behavior close to that of variable property incompressible fluids
Léon-Becerril, Elisabeth. "Analyse de stabilité et simulation numérique des colonnes à bulles." Toulouse, INSA, 2001. http://www.theses.fr/2001ISAT0010.
Full textThe objective of this thesis is the numerical simulation of hydrodynamics and mixing in bubble columns. Experimentally, two different flow behaviours for bubble columns can be observed. In the homogeneous flow, the gas bubbles move upward uniformly. If the gas flow rate increases, the system becomes heterogeneous. This flow is characterised by the presence of large structures. These structures have an unsteady behaviour, and it is possible that they enhance the mixing in bubble columns. In the first part, the existence of large structures in bubble columns is explained by a stability analysis. An uniform bubbly flow is perturbed and the analysis of stability determines the conditions at which this perturbation is amplified. This analysis is based on two main approaches presented in the literature. A particular objective of this research was the synthesis of such approaches, taking into account the importance of bubble deformation in stability. The proposed approach was validated with experimental data of gas velocity and kinematic velocity at several liquid flow rates. In addition this approach allows to analyse the stability and to determine the transition between flow regimes in bubble columns and in pipe flows. The second point is devoted to the numerical simulation of bubble columns in unsteady flows. Simulations were performed for a rectangular system without liquid flow and with a punctual gas flow rate (Sokolichin & Eigenberger, 1994). The importance of the added mass force which is modelled as a function of the gas fraction and bubble deformation is determined. Finally, a simplified CFD model of bubble column has been constructed with a rectangular surface and an uniformly distributed gas feed at the bottom. The aim of such simulations was to test different models for the drag and added mass forces. Simulated tracer tests were carried out and the results confirmed the importance of the large structures in terms of the concentration transport
Vial, Christophe. "Apport des méthodes de la mécanique des fluides à l'étude des contacteurs gaz/liquide : expérience et simulation numérique." Vandoeuvre-les-Nancy, INPL, 2000. http://docnum.univ-lorraine.fr/public/INPL_T_2000_VIAL_C.pdf.
Full textThis work is devoted to the experimental study, the modelling and the numerical simulation of the hydrodynamics of a bubble column and an external loop airlift reactor. It includes three parts. First, measuring techniques have been developed to study the local and global hydrodynamic parameters of the bubbly flow. In this section, several treatments of the fluctuating wall pressure signal have been developed to identify the prevailing flow regime; three measuring techniques have been adapted to bubbly flows in order to measure the local velocity of the continuous phase: the "Pavlov" tube, an electrochemical method and Laser Doppler Velocimetry. These techniques have completed the methods already available to study the dynamics of the gas phase: local optical probes and an ultrasound Doppler technique. Then, this set of measuring techniques has been used to characterise the hydrodynamics in both reactors. Regime transitions have been deterrnined. The local and global parameters which have been measured are: the gas hold-up; the velocity, the size and the morphology of the bubbles; the liquid velocity and its local fluctuations. The Reynolds shear stress, which could not be measured, has been estimated using a simple model. The evolution of these parameters has been related to the gas flow rate, the gas distribution and the hydrodynamic regime. The whole experimental data are finally compared to the predicted values obtained using a commercial CFD code. Several models of drag, additional forces and turbulence have been used to obtain the best agreement between calculations and experiments. The ability of this commercial code to predict correctly the flow and its current limits have been highlighted
Kong, Jian Xin. "Contribution à l'analyse numérique des méthodes de couplage particules-grille en mécanique des fluides." Habilitation à diriger des recherches, Grenoble 1, 1993. http://tel.archives-ouvertes.fr/tel-00343556.
Full textCaleyron, Fabien. "Simulation numérique par la méthode SPH de fuites de fluide consécutives à la déchirure d'un réservoir sous impact." Phd thesis, INSA de Lyon, 2011. http://tel.archives-ouvertes.fr/tel-00711040.
Full textMoet, Henri. "Simulation numérique du comportement des tourbillons de sillage dans l'atmosphère." Toulouse, INPT, 2003. http://www.theses.fr/2003INPT007H.
Full textMustapha, Hussein. "Simulation numérique de l'écoulement dans des milieux fracturés tridimensionnels." Rennes 1, 2005. http://www.theses.fr/2005REN1S166.
Full textGlinsky, Nathalie. "Simulation numérique d'écoulements hypersoniques réactifs hors-équilibre chimique." Nice, 1990. http://www.theses.fr/1990NICE4428.
Full textGillyboeuf, Jean-Philippe. "Diverses méthodes chimère pour la simulation numérique d'écoulements stationnaires." Toulouse, INPT, 1996. http://www.theses.fr/1996INPT127H.
Full textParnaudeau, Philippe. "Etude numérique d'un écoulement cisaillé turbulent complexe à basse vitesse : application à la protection rapprochée." Poitiers, 2004. http://www.theses.fr/2004POIT2311.
Full textComplex wakes are studied by Direct and Large Eddy Simulations. In order to take account of the obstacle, a method of forcing was established in numerical code which uses numerical methods of high precision on a Cartesian grid. In order to keep accurately best possible in modelling the flow around a cylinder, the method of forcing underwent modifications. Thus using a flow mirror, definite within the obstacle, we improved this method. The DNS around a cylinder highlight at these improvements. In particular, we highlighted the importance of using high order space discretizations schemes within the framework of our study. The study of a wake of cylinder for a Reynolds number of 3900 was used to validate our approach within the framework of the LES. Finally a preliminary study of a mixing layer in interaction with a wake is proposed
Renaud, Thomas. "Simulation numérique du tremblement autour de profils d'aile en régime transsonique." Paris, ENSAM, 2001. http://www.theses.fr/2001ENAM0027.
Full textVintimiglia, Anne-Sophie. "Implémentation d'une cinétique de cristallisation des polymères dans une simulation numérique bidimensionnelle par éléments finis : application à l'injection des thermoplastiques et au procédé push-pull." ENSMP, 1999. http://www.theses.fr/1999ENMP0868.
Full textNguyen, Thi Phuong. "Simulation numérique et analyse physique des couches limites turbulentes compressibles sous l'influence des gradients de pression." Toulouse, INPT, 1998. http://www.theses.fr/1998INPT041H.
Full textAlauzet, Frédéric. "Adaptation de maillage anisotrope en trois dimensions : applications aux simulations instationnaires en mécanique des fluides." Montpellier 2, 2003. http://www.theses.fr/2003MON20065.
Full textDaboussy, David. "Calculs 3D multi-fluides appliqués à la co-injection et à l'injection assistée gaz." Paris, ENSMP, 2000. http://www.theses.fr/2000ENMP1049.
Full textSaez, Estelle. "Etude numérique du remplissage 3D en fonderie." Paris, ENMP, 2003. http://www.theses.fr/2003ENMP1145.
Full textThis work deals with the numerical simulation of unsteady free surface flows of incompressible viscous fluids with finite element method. The industrial application consists of the filling stage of casting processes. It is based on the adaptation of an already existing software, REM3D®, which was initially dedicated to polymers injection moulding. Gravity and inertial effects have been introduced in the solver yielding a direct Navier Stokes method. Inertia description uses a piecewise linear interpolation of the velocity, and also the mean value of the velocity which is piecewise constant : the Galerkin discontinuous method is used to treat the advection terms. . This Navier Stokes equations resolution has been tested on several academic test cases: steady and non steady flow benchmarks have been chosen in order to validate only the mechanical solver, and afterwards, its coupling with the free surface solver. In order to simulate fluid metal flow, sliding boundary conditions have been introduced. An original algorithm of multiple consistent normal vectors has been implemented and validated. Finally, the filling stage of a specific casting benchmark has been studied, and mould filling have been carried out on industrial cases
Gaston, Laurence. "Simulation numérique par éléments finis bidimensionnels du remplissage de moules de fonderie et étude experimentale sur maquette hydraulique." ENSMP, 1997. http://www.theses.fr/1997ENMP0741.
Full textThis work deals with the numerical simulation of unsteady free surface flows of incompressible viscous fluids with the finite element method. In order to overcome the limitations due to both purely Eulerian and purely Lagrangian approaches, an intermediate ALE (Arbitrary Lagrangian Eulerian) formulation is proposed : at each time increment, the mechanical equilibrium (incompressible Navier-Stokes equations) is solved on the fluid domain, after time and space discretization. At the same time, a mesh velocity is computed using a regularization technique that enables to keep the mesh as near as possible to the optimum and respects the material flux. The thermal equilibrium is solved in an uncoupled way, and turbulent effects, if present, are taken into account via a standard k-Є model. The resulting filling software has been validated on various classical test cases, and succesfully compared to results of metal flows on an instrumented mould. In addition, hydraulic experiments on a transparent model have shown the ability of the present approach to describe free surface evolutions in complex geometries, such as those encoutered in casting
Serre, Eric. "Instabilités de couche limite dans des écoulements confinés en rotation : Simulation numérique directe par une méthode spectrale de comportements complexes." Aix-Marseille 2, 2000. http://www.theses.fr/2000AIX2A001.
Full textBaba-Aissa, Chafik. "Modélisation et simulation numérique des écoulements diphasiques, turbulents au sein des réacteurs chimiques : application aux colonnes à bulles." Vandoeuvre-les-Nancy, INPL, 1998. http://www.theses.fr/1998INPL129N.
Full textBournot, Hervé. "Modélisation numérique de la réduction de traînée d'arrière-corps par injection diphasique additionnelle." Aix-Marseille 1, 2004. http://www.theses.fr/2004AIX11058.
Full textDeutsch, Emmanuel. "Dispersion de particules dans une turbulence homogène isotrope stationnaire calculée par simulation numérique directe des grandes échelles." Ecully, Ecole centrale de Lyon, 1992. http://bibli.ec-lyon.fr/exl-doc/TH_T1454_edeutsch.pdf.
Full textMalandain, Mathias. "Simulation massivement parallèle des écoulements turbulents à faible nombre de Mach." Phd thesis, INSA de Rouen, 2013. http://tel.archives-ouvertes.fr/tel-00801502.
Full textWullens, Sébastien. "Étude numérique de la ventilation naturelle, mise en oeuvre d'un modèle fin dans une simulation de thermique du bâtiment." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAA024/document.
Full textThe building sector is the global largest energy consumer. To reduce environmental impact of buildings, passive tools must be developed. Still, air conditioning is increasingly used in the DROM-COM. The development of natural ventilation is essential to reverse this trend. Multizone models are not really suited for describing natural ventilation flows. Computational fluid dynamics (CFD) seem to be a promising way too model those flows.This thesis deals with the adaptation of a direct resolution of the Navier-Stokes equations code to describe airflows in buildings. The development, implementation and comparison of different types of pressure boundary conditions on the openings were required. The behavior of a room subjected to natural and mixed convection has been studied thanks to this work. To integrate this model into a building simulation, a “black box” object that transparently calls the CFD code on a remote server from a multizone environment has been developed. Partial cooling of the walls of a cavity subjected to natural convection has been simulated using this method
Sanchez, Laurent. "Etude expérimentale et simulation numérique d'un jet confiné en régime pulsé : application à la régurgitation de la valve mitrale." Poitiers, 2001. http://www.theses.fr/2001POIT2311.
Full textBouhadji, Abdelatif. "Analyse physique par simulation numérique de phénomènes de transition bi- et tridimensionnels dans l'écoulement compressible, visqueux autour d'une aile d'avion." Toulouse, INPT, 1998. http://www.theses.fr/1998INPT026H.
Full textDoyeux, Vincent. "Modelisation et simulation de systemes multi-fluides. Application aux ecoulements sanguins." Phd thesis, Université de Grenoble, 2014. http://tel.archives-ouvertes.fr/tel-00939930.
Full textColin, Olivier. "Simulations aux grandes échelles de la combustion turbulente prémélangée dans les statoréacteurs." Toulouse, INPT, 2000. http://www.theses.fr/2000INPT011H.
Full textDargaud, Jean-Baptiste. "Simulation numérique de l'onde de souffle et du bruit de jet au décollage d'un lanceur." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2013. http://tel.archives-ouvertes.fr/tel-00995841.
Full textWernert, Philippe. "Méthodes de visualisation et de PIV appliquées à l'étude du décrochage dynamique profond et comparaison avec des résultats de simulation numérique." Aix-Marseille 2, 1997. http://www.theses.fr/1997AIX22110.
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