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Author: Frédéric Ducros
Publisher:
ISBN:
Category :
Languages : fr
Pages : 242
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Book Description
LA TRANSITION A LA TURBULENCE DES COUCHES LIMITES COMPRESSIBLES POUR DES NOMBRES DE MACH DE 0.5 ET 4.5 EST ETUDIEE PAR SIMULATIONS DIRECTES ET DES GRANDES ECHELLES. DES ETUDES A LA FOIS STATISTIQUES ET VISUELLES ONT PERMIS DE RETROUVER LES CARACTERISTIQUES QUANTITATIVES DES DIVERSES PHASES DES ECOULEMENTS ET LES MECANISMES DE LA TRANSITION A LA TURBULENCE. LE DEVELOPPEMENT D'UN NOUVEAU MODELE DE VISCOSITE TURBULENTE DIT MODELE DE LA FONCTION DE STRUCTURE FILTREE EST PROPOSE: CE MODELE CONCENTRE LA DISSIPATION TURBULENTE UNIQUEMENT SUR LES REGIONS CONTENANT DES PETITES ECHELLES ET A PERMIS LA SIMULATION DES GRANDES ECHELLES DE LA TRANSITION A LA TURBULENCE D'UNE COUCHE LIMITE A MACH 0.5 SE DEVELOPPANT SPATIALEMENT, DONNANT AINSI DES RESULTATS QUANTITATIFS PROCHES DE CEUX TROUVES LORS D'UNE SIMULATION DIRECTE POUR UN COUT DE CALCUL PLUS FAIBLE
Author: Frédéric Ducros
Publisher:
ISBN:
Category :
Languages : fr
Pages : 242
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Book Description
LA TRANSITION A LA TURBULENCE DES COUCHES LIMITES COMPRESSIBLES POUR DES NOMBRES DE MACH DE 0.5 ET 4.5 EST ETUDIEE PAR SIMULATIONS DIRECTES ET DES GRANDES ECHELLES. DES ETUDES A LA FOIS STATISTIQUES ET VISUELLES ONT PERMIS DE RETROUVER LES CARACTERISTIQUES QUANTITATIVES DES DIVERSES PHASES DES ECOULEMENTS ET LES MECANISMES DE LA TRANSITION A LA TURBULENCE. LE DEVELOPPEMENT D'UN NOUVEAU MODELE DE VISCOSITE TURBULENTE DIT MODELE DE LA FONCTION DE STRUCTURE FILTREE EST PROPOSE: CE MODELE CONCENTRE LA DISSIPATION TURBULENTE UNIQUEMENT SUR LES REGIONS CONTENANT DES PETITES ECHELLES ET A PERMIS LA SIMULATION DES GRANDES ECHELLES DE LA TRANSITION A LA TURBULENCE D'UNE COUCHE LIMITE A MACH 0.5 SE DEVELOPPANT SPATIALEMENT, DONNANT AINSI DES RESULTATS QUANTITATIFS PROCHES DE CEUX TROUVES LORS D'UNE SIMULATION DIRECTE POUR UN COUT DE CALCUL PLUS FAIBLE
Author: Peter R. Voke
Publisher: Springer Science & Business Media
ISBN: 9401592853
Category : Science
Languages : en
Pages : 452
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Book Description
The practical importance of turbulence led the U.K. Royal Academy of Engineering to launch an Initiative on Turbulence, the most important outcome of which was the definition and agreement of the 1999 Newton Institute Research Programme on Turbulence. The main aim of the- month programme, held at the institute in Cambridge, was to bring together the mathematics and engineering communities involved in the turbulence area to address the many problems and to map out future strategy. As a part of the Research Programme, a Symposium on Direct and Large-Eddy Simulation was jointly organised with ERCOFfAC through their Large-Eddy Simulation Interest Group and took place in May 1999. Two previous ERCOFf AC Workshops had already taken place on these closely related varieties of turbulence simulation, at The University of Surrey in 1994 and at Universite Joseph Fourier, Grenoble in 1996. The Symposium at Cambridge was therefore the third in the ERCOFTAC series, enhanced by the presence of leading figures in the field from Europe and the USA who were resident at INI for that period of the Research Programme. Professors M. Germano, A. Leonard, J. Jimenez, R. Kerr and S. Sarkar gave the invited lectures, text versions of which will be found in this volume. As occurred at the previous two ERCOFT AC workshops, there were almost one hundred participants mostly from Europe but including some from Japan and the USA, including on this occasion resident scientists of the INI Research Programme.
Author: P. Sagaut
Publisher: Springer Science & Business Media
ISBN: 9783540263449
Category : Computers
Languages : en
Pages : 600
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Book Description
First concise textbook on Large-Eddy Simulation, a very important method in scientific computing and engineering From the foreword to the third edition written by Charles Meneveau: "... this meticulously assembled and significantly enlarged description of the many aspects of LES will be a most welcome addition to the bookshelves of scientists and engineers in fluid mechanics, LES practitioners, and students of turbulence in general."
Author: M. Lesieur
Publisher: Cambridge University Press
ISBN: 9780521781244
Category : Mathematics
Languages : en
Pages : 240
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Book Description
Large-Eddy Simulations of Turbulence is a reference for LES, direct numerical simulation and Reynolds-averaged Navier-Stokes simulation.
Author: Pierre Sagaut
Publisher: Springer Science & Business Media
ISBN: 3662044161
Category : Science
Languages : en
Pages : 326
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Book Description
First concise textbook on Large-Eddy Simulation, a very important method in scientific computing and engineering From the foreword to the third edition written by Charles Meneveau: "... this meticulously assembled and significantly enlarged description of the many aspects of LES will be a most welcome addition to the bookshelves of scientists and engineers in fluid mechanics, LES practitioners, and students of turbulence in general."
Author: Egon Krause
Publisher: Springer Science & Business Media
ISBN: 9401150427
Category : Technology & Engineering
Languages : en
Pages : 473
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Book Description
The decision of the General Assembly of the International Union of Theoretical and Applied Mechanics to organize a Symposium on Dynamics of Slender Vortices was greeted with great enthusiasm. The acceptance of the proposal, forwarded by the Deutsches Komitee fiir Mechanik (DEKOMECH) signalized, that there was a need for discussing the topic chosen in the frame the IUTAM Symposia offer. Also the location of the symposium was suitably chosen: It was decided to hold the symposium at the RWTH Aachen, where, years ago, Theodore von Karman had worked on problems related to those to be discussed now anew. It was clear from the beginning of the planning, that the symposium could only be held in the von Karman-Auditorium ofthe Rheinisch-Westfalische Technische Hochschule Aachen, a building named after him. The symposium was jointly organized by the editors of this volume, strongly supported by the local organizing committee. The invitations of the scientific committee brought together scientists actively engaged in research on the dynamics of slender vortices. It was the aim of the committee to have the state of the art summarized and also to have the latest results of specific problems investigated communicated to the participants of the symposium. The topics chosen were asymptotic theories, numerical methods, vor tices in shear layers, interaction of vortices, vortex breakdown, vortex sound, and aircraft and helicopter vortices.
Author: Bernard Marquez
Publisher:
ISBN:
Category :
Languages : fr
Pages : 232
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Book Description
L'objectif de ce travail est d'étendre un code industriel, résolvant les équations de Navier-Stokes stationnaires moyennées (RANS), à l'instationnaire puis à la simulation des grandes échelles (LES). Une approximation éléments finis en espace fondée sur la formulation Galerkin/Moindres Carrés est utilisée. L'intégration temporelle est assurée par un schéma explicite Runge Kutta à quatre pas. Les différentes formulaions spatiales et le schéma en temps sont décrits, analysés sur l'équation d'advection monodimensionnelle, puis validés sur des calculs d'amplification temporelle d'instabilités (couche de mélange et couche limite bidimensionnelles). Le modèle de Smagorinsky et une variante sélective sont implémentés. La validation des méthodes numériques et des différents modèles de sous-maille est effectuée sur des simulations de turbulence homogène isotrope et de couches de mélange temporelles tridimensionnelles à différents nombres de Reynolds. L'application finale est l'étude de l'effet d'un jet supersonique sur une couche de mélange plane confinée subsonique supersonique. Les résultats des différentes simulations des grandes échelles sont comparés à une expérience réalisée au CEAT de Poitiers ainsi qu'avec des simulations moyennées k-e.
Author: Olivier Metais
Publisher: Springer Science & Business Media
ISBN: 3662089750
Category : Science
Languages : en
Pages : 312
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Book Description
Numerical large-eddy simulation techniques are booming at present and will have a decisive impact on industrial modeling and flow control. The book represents the general framework in physical and spectral space. It also gives the recent subgrid-scale models. Topics treated include compressible turbulence research, turbulent combustion, acoustic predictions, vortex dynamics in non-trivial geometries, flows in nuclear reactors and problems in atmospheric and geophysical sciences. The book addresses numerical analysts, physicists, and engineers.
Author: Doina Cioranescu
Publisher: CRC Press
ISBN: 9780582369269
Category : Mathematics
Languages : en
Pages : 354
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Book Description
This book presents the texts of selected lectures on recent work in the field of nonlinear partial differential equations delivered by leading international experts at the well-established weekly seminar held at the Collège de France. Emphasis is on applications to numerous areas, including control theory, theoretical physics, fluid and continuum mechanics, free boundary problems, dynamical systems, scientific computing, numerical analysis, and engineering. Proceedings of this seminar will be of particular interest to postgraduate students and specialists in the area of nonlinear partial differential equations.
Author: J.P. Bonnet
Publisher: Springer
ISBN: 3709126762
Category : Science
Languages : en
Pages : 366
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Book Description
This book is a unique opportunity to present in a single volume information that is needed for both experimentalists, theoreticians and computationalists for the detection, analysis, prediction and control of eddy structures in turbulent shear flows. Major identification techniques of Eddy Structures in Turbulent Shear Flows are presented together with applications to vortex dynamics, turbulence management and flow control, for experimental and numerical applications with new prediction methods: Eduction Schemes, Proper Orthogonal Decomposition, Stochastic Estimation, Pattern Recognition Analysis, Wavelet Transform. Illustrations of the use of the different methods are given.
