Modelisation De La Turbulence Inhomogene En Presence De Rotation

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Modélisation de la turbulence inhomogène en présence de rotation

Author : Laurent Elena
Publisher :
ISBN 13 :
Total Pages : 246 pages
Book Rating : 4.:/5 (49 download)

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Book Synopsis Modélisation de la turbulence inhomogène en présence de rotation by : Laurent Elena

Download or read book Modélisation de la turbulence inhomogène en présence de rotation written by Laurent Elena and published by . This book was released on 1994 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: ON A DEVELOPPE DES MODELISATIONS AVANCEES DE LA TURBULENCE POUR LE CALCUL D'ECOULEMENTS TURBULENTS CONFINES SOUMIS A UN EFFET DE ROTATION RAPIDE. LES APPLICATIONS SONT NOMBREUSES ET CONCERNENT NOTAMMENT LES ECOULEMENTS TURBULENTS DANS LES ESPACES INTERDISQUES DES TURBOMACHINES. UN CODE DE VOLUMES FINIS PERMETTANT DE METTRE EN UVRE LES MODELES AU SECOND ORDRE DANS LE CAS D'ECOULEMENTS EN ROTATION A ETE MIS AU POINT. POUR CELA, ON A DEVELOPPE UNE PROCEDURE BASEE SUR UN MAILLAGE SEMI-DECALE (GRILLES DECALEES POUR LES VITESSES MAIS PAS POUR LES TENSIONS) PERMETTANT DE RESOUDRE EN BLOC LES EQUATIONS AUX TENSIONS DE REYNOLDS FAVORISANT AINSI LA DEMARCHE PROGRESSIVE VERS UNE MEILLEURE PRISE EN COMPTE DE LA PHYSIQUE: UN MODELE DE TYPE ENERGIE-DISSIPATION, UN MODELAGE ALGEBRIQUE DES TENSIONS DE REYNOLDS, TROIS MODELES D'EQUATIONS DE TRANSPORT DES TENSIONS DE REYNOLDS DONT UNE CONTRIBUTION ORIGINALE PRENANT EN COMPTE CERTAINS EFFETS IMPLICITES DE LA ROTATION QUI AFFECTENT LA TURBULENCE. UN NOMBRE IMPORTANT D'ECOULEMENTS INTERNES SOUMIS A UNE FORTE ROTATION ONT ETE CONSIDERES: CAVITE TOURNANTE SOUMISE A UN FLUX, SYSTEMES ROTOR-STATOR AVEC ET SANS FLUX DE MASSE IMPOSE. LES EXPLOITATIONS ONT PERMIS DE PRECISER LES INFLUENCES DE LA ROTATION ET DU DEBIT IMPOSE SUR LA STRUCTURE DE L'ECOULEMENT ET D'IDENTIFIER LES DIFFERENTS REGIMES. LES CONFRONTATIONS ENTRE PREVISIONS NUMERIQUES ET DONNEES EXPERIMENTALES ONT ETE PRIVILEGIEES, METTANT EN EVIDENCE QUE LES MODELES AU SECOND ORDRE CONSTITUENT UN NIVEAU DE FERMETURE ADEQUAT AFIN D'ETUDIER CES ECOULEMENTS. LE MODELE PRENANT EN COMPTE LES EFFETS DE LA ROTATION SUR LA TURBULENCE A PERMIS D'APPORTER D'IMPORTANTES AMELIORATIONS ET OUVRE AINSI DES PERSPECTIVES NOUVELLES POUR LA PREDETERMINATION DES ECOULEMENTS TURBULENTS CONFINES EN ROTATION

Turbulence and Transition Modelling

Author : M. Hallbäck
Publisher : Springer Science & Business Media
ISBN 13 : 9780792340607
Total Pages : 394 pages
Book Rating : 4.3/5 (46 download)

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Book Synopsis Turbulence and Transition Modelling by : M. Hallbäck

Download or read book Turbulence and Transition Modelling written by M. Hallbäck and published by Springer Science & Business Media. This book was released on 1996-06-30 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this book is to give, within a single volume, an introduction to the fields of turbulence modelling and transition-to-turbulence prediction, and to provide the physical background for today's modelling approaches in these problem areas as well as giving a flavour of advanced use of prediction methods. Turbulence modelling approaches, ranging from single-point models based on the eddy-viscosity concept and the Reynolds stress transport equations (Chapters 3,4,5), to large-eddy simulation (LES) techniques (Ch. 7), are covered. The foundations of hydrodynamical stability and transition are presented (Ch. 2) along with transition prediction methods based on single-point closures (Ch. 6), LES techniques (Ch. 7) and the parabolized stability equations (Ch. 8). The book addresses engineers and researchers, in industry or academia, who are entering into the fields of turbulence or transition modelling research or need to apply turbulence or transition prediction methods in their work.

Modelling Turbulence in Engineering and the Environment

Author : Kemal Hanjalić
Publisher : Cambridge University Press
ISBN 13 : 1108883354
Total Pages : 536 pages
Book Rating : 4.1/5 (88 download)

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Book Synopsis Modelling Turbulence in Engineering and the Environment by : Kemal Hanjalić

Download or read book Modelling Turbulence in Engineering and the Environment written by Kemal Hanjalić and published by Cambridge University Press. This book was released on 2022-11-24 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modelling transport and mixing by turbulence in complex flows are huge challenges for computational fluid dynamics (CFD). This highly readable book introduces readers to modelling levels that respect the physical complexity of turbulent flows. It examines the hierarchy of Reynolds-averaged Navier-Stokes (RANS) closures in various situations ranging from fundamental flows to three-dimensional industrial and environmental applications. The general second-moment closure is simplified to linear eddy-viscosity models, demonstrating how to assess the applicability of simpler schemes and the conditions under which they give satisfactory predictions. The principal changes for the second edition reflect the impact of computing power: a new chapter devoted to unsteady RANS and another on how large-eddy simulation, LES, and RANS strategies can be effectively combined for particular applications. This book will remain the standard for those in industry and academia seeking expert guidance on the modelling options available, and for graduate students in physics, applied mathematics and engineering entering the world of turbulent flow CFD.

Modeling and Simulation of Turbulent Flows

Author : Roland Schiestel
Publisher : John Wiley & Sons
ISBN 13 : 0470393467
Total Pages : 751 pages
Book Rating : 4.4/5 (73 download)

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Book Synopsis Modeling and Simulation of Turbulent Flows by : Roland Schiestel

Download or read book Modeling and Simulation of Turbulent Flows written by Roland Schiestel and published by John Wiley & Sons. This book was released on 2010-01-05 with total page 751 pages. Available in PDF, EPUB and Kindle. Book excerpt: This title provides the fundamental bases for developing turbulence models on rational grounds. The main different methods of approach are considered, ranging from statistical modelling at various degrees of complexity to numerical simulations of turbulence. Each of these various methods has its own specific performances and limitations, which appear to be complementary rather than competitive. After a discussion of the basic concepts, mathematical tools and methods for closure, the book considers second order closure models. Emphasis is placed upon this approach because it embodies potentials for clarifying numerous problems in turbulent shear flows. Simpler, generally older models are then presented as simplified versions of the more general second order models. The influence of extra physical parameters is also considered. Finally, the book concludes by examining large Eddy numerical simulations methods. Given the book’s comprehensive coverage, those involved in the theoretical or practical study of turbulence problems in fluids will find this a useful and informative read.

Engineering Turbulence Modelling and Experiments - 4

Author : D. Laurence
Publisher : Elsevier
ISBN 13 : 0080530982
Total Pages : 975 pages
Book Rating : 4.0/5 (85 download)

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Book Synopsis Engineering Turbulence Modelling and Experiments - 4 by : D. Laurence

Download or read book Engineering Turbulence Modelling and Experiments - 4 written by D. Laurence and published by Elsevier. This book was released on 1999-04-14 with total page 975 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings contain the papers presented at the 4th International Symposium on Engineering Turbulence Modelling and Measurements held at Ajaccio, Corsica, France from 24-26 May 1999. It follows three previous conferences on the topic of engineering turbulence modelling and measurements. The purpose of this series of symposia is to provide a forum for presenting and discussing new developments in the area of turbulence modelling and measurements, with particular emphasis on engineering-related problems. Turbulence is still one of the key issues in tackling engineering flow problems. As powerful computers and accurate numerical methods are now available for solving the flow equations, and since engineering applications nearly always involve turbulence effects, the reliability of CFD analysis depends more and more on the performance of the turbulence models. Successful simulation of turbulence requires the understanding of the complex physical phenomena involved and suitable models for describing the turbulent momentum, heat and mass transfer. For the understanding of turbulence phenomena, experiments are indispensable, but they are equally important for providing data for the development and testing of turbulence models and hence for CFD software validation.

ETUDE D'UNE TURBULENCE HOMOGENE SOUMISE A DES EFFETS COUPLES DE ROTATION ET DE CONTRACTION AXISYMTRIQUE

Author : AGNES.. DUPEUBLE
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (49 download)

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Book Synopsis ETUDE D'UNE TURBULENCE HOMOGENE SOUMISE A DES EFFETS COUPLES DE ROTATION ET DE CONTRACTION AXISYMTRIQUE by : AGNES.. DUPEUBLE

Download or read book ETUDE D'UNE TURBULENCE HOMOGENE SOUMISE A DES EFFETS COUPLES DE ROTATION ET DE CONTRACTION AXISYMTRIQUE written by AGNES.. DUPEUBLE and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: UN MONTAGE EXPERIMENTAL PERMET DE GENERER UN ECOULEMENT TURBULENT HOMOGENE, MIS EN ROTATION SOLIDE A L'AIDE D'UNE PARTIE ROTATIVE, PUIS SOUMIS A UNE CONTRACTION AXISYMETRIQUE. LE CHAMP DE VITESSE EST SONDE A L'AVAL DE CE DISPOSITIF AU MOYEN DE FILS CHAUDS. LES QUANTITES TURBULENTES ISSUES DE CES MESURES MONTRENT QUE LA CONTRACTION CREE UNE IMPORTANTE ANISOTROPIE PRINCIPALEMENT SITUEE SUR LES GRANDEURS LONGITUDINALES; LA ROTATION SEMBLE ATTENUER CE PHENOMENE. UNE ANALYSE SPECTRALE DE LA PARTIE LINEAIRE DES EQUATIONS CONFIRME LE ROLE PREPONDERANT DE LA ROTATION SUR CES TERMES EN PRESENCE D'ANISOTROPIE. LE CALCUL SPECTRAL DU TERME DE PRESSION LINEAIRE COMPARE A SA MODELISATION DANS L'ESPACE PHYSIQUE MONTRE LA DEFAILLANCE DES MODELES PHYSIQUES SIMPLES EN PRESENCE DE ROTATION

Symposium on Turbulent Shear Flows

Author :
Publisher :
ISBN 13 :
Total Pages : 450 pages
Book Rating : 4.0/5 ( download)

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Book Synopsis Symposium on Turbulent Shear Flows by :

Download or read book Symposium on Turbulent Shear Flows written by and published by . This book was released on with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Advances in Turbulence 2

Author : Hans-Hermann Fernholz
Publisher : Springer Science & Business Media
ISBN 13 : 3642838227
Total Pages : 528 pages
Book Rating : 4.6/5 (428 download)

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Book Synopsis Advances in Turbulence 2 by : Hans-Hermann Fernholz

Download or read book Advances in Turbulence 2 written by Hans-Hermann Fernholz and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Second European Turbulence Conference was held at the Technische Univer sitat Berlin, Federal Republic of Germany, from August 30th to September 2nd 1988 under the auspices of the European Mechanics Committee. It was primar ily devoted to fundamental aspects of turbulence, and aimed at bringing together engineers, physicists, and mathematicians. The scientific committee - serving also as Sub-committee of the European Turbulence Conference - consisted of the following members: G. Comte-Bellot (Lyon), H.-H. Fernholz and H.E. Fiedler (both from Berlin) as co-chairmen of the conference, U. Frisch (Nice), J.C.R. Hunt (Cambridge), E. Krause (Aachen), M. Landahl (Stockholm), A.M. Obukhov (Moscow), and G. Ooms (Amsterdam). The conference programme comprised 6 invited lectures and 94 contributions, presented either orally or at poster sessions. There were 165 participants from 18 countries. All papers published in these conference proceedings were, with the exception of the invited ones, again refereed by the members of the scientific committee. The main research topics discussed at this meeting were stability and gener ation of turbulence, effects of rotation, stratification and buoyancy forces, novel instrumentation, manipulation and control, boundary layers with separation and reattachment, computer simulation, turbulent diffusion, image analysis and flow visualization, vorticity dynamics and turbulence, and large-scale structures. We have taken the liberty of regrouping some papers following the submitted final versions for this volume. Authors may therefore find their paper under a different heading from that in the conference programme.

Fluid Mechanics of Planets and Stars

Author : Michael Le Bars
Publisher : Springer
ISBN 13 : 3030220745
Total Pages : 247 pages
Book Rating : 4.0/5 (32 download)

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Book Synopsis Fluid Mechanics of Planets and Stars by : Michael Le Bars

Download or read book Fluid Mechanics of Planets and Stars written by Michael Le Bars and published by Springer. This book was released on 2019-06-29 with total page 247 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explores the dynamics of planetary and stellar fluid layers, including atmospheres, oceans, iron cores, and convective and radiative zones in stars, describing the different theoretical, computational and experimental methods used to study these problems in fluid mechanics, including the advantages and limitations of each method for different problems. This scientific domain is by nature interdisciplinary and multi-method, but while much effort has been devoted to solving open questions within the various fields of mechanics, applied mathematics, physics, earth sciences and astrophysics, and while much progress has been made within each domain using theoretical, numerical and experimental approaches, cross-fertilizations have remained marginal. Going beyond the state of the art, the book provides readers with a global introduction and an up-to-date overview of relevant studies, fully addressing the wide range of disciplines and methods involved. The content builds on the CISM course “Fluid mechanics of planets and stars”, held in April 2018, which was part of the research project FLUDYCO, supported by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program.

New Tools in Turbulence Modelling

Author : Olivier Metais
Publisher : Springer Science & Business Media
ISBN 13 : 3662089750
Total Pages : 312 pages
Book Rating : 4.6/5 (62 download)

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Book Synopsis New Tools in Turbulence Modelling by : Olivier Metais

Download or read book New Tools in Turbulence Modelling written by Olivier Metais and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

ASME Technical Papers

Author :
Publisher :
ISBN 13 :
Total Pages : 506 pages
Book Rating : 4.0/5 ( download)

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Book Synopsis ASME Technical Papers by :

Download or read book ASME Technical Papers written by and published by . This book was released on 1996 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt:

One-equation LES Modeling of Rotating Turbulence

Author : Hao Lu
Publisher :
ISBN 13 :
Total Pages : 166 pages
Book Rating : 4.:/5 (891 download)

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Book Synopsis One-equation LES Modeling of Rotating Turbulence by : Hao Lu

Download or read book One-equation LES Modeling of Rotating Turbulence written by Hao Lu and published by . This book was released on 2007 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Etude théorique de la turbulence homogène soumise à des effets de rotation et modélisation en vue de l'implantation au sein d'un code résolvant les équations de Navier-Strokes

Download Etude théorique de la turbulence homogène soumise à des effets de rotation et modélisation en vue de l'implantation au sein d'un code résolvant les équations de Navier-Strokes PDF Online Free

Author : Jean-Louis Lubrano
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (49 download)

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Book Synopsis Etude théorique de la turbulence homogène soumise à des effets de rotation et modélisation en vue de l'implantation au sein d'un code résolvant les équations de Navier-Strokes by : Jean-Louis Lubrano

Download or read book Etude théorique de la turbulence homogène soumise à des effets de rotation et modélisation en vue de l'implantation au sein d'un code résolvant les équations de Navier-Strokes written by Jean-Louis Lubrano and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: La rotation a une influence certaine sur la turbulence homogène par le biais des forces de Coriolis. Ces effets, mal pris en compte par les modélisations classiques, nécessitent une approche plus élaborée. Un recours possible est la recherche d'informations dans l'espace spectral où les différents termes de l'équation du tenseur spectral ont une signification physique plus facile à appréhender. Ainsi a-t'il été mis clairement en evidence une partition de l'anisotropie en une composante caractérisant la directivité du champ énergétique et une composante définissant sa polarisation. Cette séparation s'accompagne de comportements différents tant sur les termes linéaires que non linéaires et permet une modélisation en accord avec les phénomènes observés. Une extension à une turbulence homogène soumise à une déformation plus générale a été proposée dans le cadre de ce travail. Malheureusement, les résultats laissent supposer qu'il est nécessaire d'appliquer un développement au second ordre et il a été préféré une modélisation provenant d'une étude américaine de W.C. Reynolds, cette dernière se rattachant a la théorie spectrale. Un modèle construit à partir de ces divers éléments a été implanté au sein d'un code de calcul Navier Stokes sur une configuration de type canal plan avec effets de rotation. Cette étude permet donc d'avoir une base de travail confortable, afin d'obtenir une modélisation future dont les résultats devraient s'avérer probants.

Paper

Author :
Publisher :
ISBN 13 :
Total Pages : 514 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Paper by :

Download or read book Paper written by and published by . This book was released on 1996 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Progress in Turbulence Research

Author : Herman Branover
Publisher : AIAA (American Institute of Aeronautics & Astronautics)
ISBN 13 : 9781563470998
Total Pages : 378 pages
Book Rating : 4.4/5 (79 download)

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Book Synopsis Progress in Turbulence Research by : Herman Branover

Download or read book Progress in Turbulence Research written by Herman Branover and published by AIAA (American Institute of Aeronautics & Astronautics). This book was released on 1994 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt:

4th UK National Conference on Heat Transfer

Author :
Publisher :
ISBN 13 :
Total Pages : 600 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis 4th UK National Conference on Heat Transfer by :

Download or read book 4th UK National Conference on Heat Transfer written by and published by . This book was released on 1995 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proceedings of the 4th UK National Conference on Heat Transfer organized by the Energy and Thermofluids Mechanics Group of the Institute of Mechanical Engineers.

Modélisation de la turbulence dans des écoulements de fluide compressible, dans le cadre des turbomachines

Author : Christine Frick
Publisher :
ISBN 13 :
Total Pages : 804 pages
Book Rating : 4.:/5 (493 download)

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Book Synopsis Modélisation de la turbulence dans des écoulements de fluide compressible, dans le cadre des turbomachines by : Christine Frick

Download or read book Modélisation de la turbulence dans des écoulements de fluide compressible, dans le cadre des turbomachines written by Christine Frick and published by . This book was released on 1999 with total page 804 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'objectif de cette thèse est de tenir compte des effets de rotation moyenne, tels qu'ils sont rencontrés dans les turbomachines, dans un modèle de type K-ε [epsilon]. Dans ce but, nous élaborons une démarche de modélisation rationnelle, respectueuse à la fois des propriétés d'invariance tensorielle des termes à fermer, et de leurs propriétés d'invariance vis à vis de tout changement de référentiel. Ces dernières sont effectivement d'une importance capitale lorsque les effets de rotation sont à considérer. Le principe de cette démarche repose de plus sur un développement autour de faibles écarts à l'isotropie et à l'homogénéité statistiques du champ fluctuant. Cinq cas de validation de difficulté croissante permettent ensuite de comparer le modèle proposé à d'autres modèles de la littérature, intégrant également ces effets. D'une manière générale, les différents modèles utilisés dans ce travail pour prendre en compte l'effet de rotation moyenne dans un modèle K-ε [epsilon] vont dans le sens d'une amélioration des prédictions, tant en présence de rotation qu'en l'absence de celle-ci. Ils permettent en outre de mettre en évidence certaines limitations inhérentes au modèle K-ε, notamment son manque d'effet de mémoire sur le tenseur de Reynolds. Cette thèse ouvre par conséquent la voie à des modèles plus élaborés qui, basés sur la même démarche rationnelle, prendraient en compte explicitement l'effet de rotation moyenne dans la fermeture reliant plus généralement le tenseur de Reynolds au gradient de vitesse moyenne