Contributions à la simulation d'écoulement tridimensionnel par méthode de vortex PDF Download
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Author: Mohammed el Hamraoui
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Author: Mohammed el Hamraoui
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Author: GERARD.. PAYEN
Publisher:
ISBN:
Category :
Languages : fr
Pages :
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UN OUTIL NUMERIQUE DESTINE A LA SIMULATION INSTATIONNAIRE D'ECOULEMENTS INCOMPRESSIBLES VISQUEUX PARTIELLEMENT CONFINES DANS LE CADRE D'UNE APPROXIMATION BI-DIMENSIONNELLE PLANE EST PRESENTE. BASE SUR UNE METHODE DE RANDOM VORTEX HYBRIDE, IL EXPLOITE L'EQUATION DE TRANSPORT DE LA VORTICITE PAR UNE DISCRETISATION ADAPTATIVE SUR DES ELEMENTS LAGRANGIENS A SUPPORTS COMPACTS. DES ALGORITHMES DESTINES A AMELIORER LA PERFORMANCE DE CALCUL ET LE FLEXIBILITE SONT EGALEMENT INTRODUITS. UNE ETUDE BIBLIOGRAPHIQUE RAISONNEE RELATIVE AUX ECOULEMENTS AU TRAVERS D'EXPANSIONS SYMETRIQUES BRUSQUES EST MENEE. LES PARAMETRES DETERMINANTS SONT DEGAGES. DIFFERENTS REGIMES SONT DISTINGUES: LES TRANSITIONS RENCONTREES A NOMBRE DE REYNOLDS CROISSANT CONDUISENT D'UN ECOULEMENT RECIRCULANT SYMETRIQUE STATIONNAIRE A DES CONFIGURATIONS ASYMETRIQUES PUIS A L'APPARITION D'INSTABILITES. CERTAINES JUSTIFICATIONS PHENOMENOLOGIQUES SONT PROPOSEES ET LES MECANISMES MAL CERNES SONT SOULIGNES. LA METHODE NUMERIQUE DECRITE EST APPLIQUEE A LA SIMULATION DE CES ECOULEMENTS ET LES RESULTATS OBTENUS COMPARES AUX DONNEES EXPERIMENTALES ET NUMERIQUES DISPONIBLES. LES PREDICTIONS EFFECTUEES SONT EN EXCELLENT ACCORD DANS LE CAS DU REGIME SYMETRIQUE STATIONNAIRE. A UN NOMBRE DE REYNOLDS PLUS ELEVE, LES CALCULS CONDUISENT A DES REGIMES ASYMETRIQUES DONT SEULE LA NATURE EST CONFORME AUX RESULTATS EXPERIMENTAUX. LE DECLENCHEMENT D'INSTABILITES APPARAIT A UNE VALEUR DE REYNOLDS PLUS FAIBLE QU'EXPERIMENTALEMENT. LE ROLE DE LA METHODE NUMERIQUE DANS CES DESACCORDS EST SUGGERE, AINSI QUE D'EVENTUELS PALLIATIFS
Author: Assad Abdulwahad
Publisher:
ISBN:
Category :
Languages : fr
Pages : 155
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Ce travail est consacré à l'étude et à la mise en oeuvre de la méthode des vortex aléatoires (Random Vortex Method (RVM)) qui permet de simuler des écoulements turbulents, bidimensionnels, incompressibles et instationnaires. L'algorithme de cette méthode et les conditions d'adhérence sont décrits. Deux types d'écoulements sont simulés. Le premier est l'écoulement de Couette-Poiseuille; le deuxième un écoulement pulsé autour d'une plaque plane (couche limite pulsée). Cette étude a permis de tester la RVM pour les deux types d'écoulements. Pour l'écoulement de Couette-Poiseuille, nous avons calculé le profil de vitesse moyenne ainsi que les grandeurs statistiques concernant les fluctuations de vitesses, et nous avons mis en évidence les structures cohérentes. Pour l'écoulement pulsé autour d'une plaque plane, des simulations sont réalisées pour une gamme de nombre de Reynolds (10[puissance]3-7.10[puissance]6). Une étude préliminaire expérimentale a été réalisée pour un écoulement pulsé autour d'une plaque plane afin de valider certains résultats numériques. Nous constatons un bon accord entre la simulation numérique et l'expérimentation.
Author:
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Category :
Languages : en
Pages : 214
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Book Description
This thesis is concerned with the applications of vortex methods to the problem of unsteady, separated flows in two and three dimensions and can be divided into three parts. In the first part, an improved method for satisfying the boundary conditions on a flat plate is developed and applied to the two-dimensional separated flow problem. In the second part, an improved three-dimensional vortex particle method is developed. In the third part, the two-dimensional method developed in the first part is modified and extended to three dimensions.
Author:
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Category : Aeronautics
Languages : en
Pages : 484
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Author: Tuncer Cebeci
Publisher: Springer Science & Business Media
ISBN: 9783540402886
Category : Science
Languages : en
Pages : 140
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Book Description
After a brief review of the more popular turbulence models, the author presents and discusses accurate and efficient numerical methods for solving the boundary-layer equations with turbulence models based on algebraic formulas (mixing length, eddy viscosity) or partial-differential transport equations. A computer program employing the Cebeci-Smith model and the k-e model for obtaining the solution of two-dimensional incompressible turbulent flows without separation is discussed in detail and is presented in the accompanying CD.
Author:
Publisher:
ISBN: 9789283610724
Category : Computational fluid dynamics
Languages : en
Pages : 198
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Author: Mohamed Meddi
Publisher: MDPI
ISBN: 3039214314
Category : Technology & Engineering
Languages : en
Pages : 212
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Book Description
Climate and anthropogenic changes impact the conditions of erosion and sediment transport in rivers. Rainfall variability and, in many places, the increase of rainfall intensity have a direct impact on rainfall erosivity. Increasing changes in demography have led to the acceleration of land cover changes in natural areas, as well as in cultivated areas, and, sometimes, in degraded areas and desertified landscapes. These anthropogenized landscapes are more sensitive to erosion. On the other hand, the increase in the number of dams in watersheds traps a great portion of sediment fluxes, which do not reach the sea in the same amount, nor at the same quality, with consequences on coastal geomorphodynamics. This book is dedicated to studies on sediment fluxes from continental areas to coastal areas, as well as observation, modeling, and impact analysis at different scales from watershed slopes to the outputs of large river basins. This book is concentrated on a number of keywords: “erosion” and “sediment transport”, “model” and “practice”, and “change”. The keywords are briefly discussed with respect to the relevant literature. The contributions in this book address observations and models based on laboratory and field data, allowing researchers to make use of such resources in practice under changing conditions.
Author:
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ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 950
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Author: Philippe Gourbesville
Publisher: Springer
ISBN: 9811072183
Category : Science
Languages : en
Pages : 1205
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Book Description
This book gathers a collection of extended papers based on presentations given during the SimHydro 2017 conference, held in Sophia Antipolis, Nice, France on June 14–16, 2017. It focuses on how to choose the right model in applied hydraulics and considers various aspects, including the modeling and simulation of fast hydraulic transients, 3D modeling, uncertainties and multiphase flows. The book explores both limitations and performance of current models and presents the latest developments in new numerical schemes, high-performance computing, multiphysics and multiscale methods, and better interaction with field or scale model data. It gathers the lastest theoretical and innovative developments in the modeling field and presents some of the most advance applications on various water related topics like uncertainties, flood simulation and complex hydraulic applications. Given its breadth of coverage, it addresses the needs and interests of practitioners, stakeholders, researchers and engineers alike.
