Download or read book ETUDE STATISTIQUE DE LA STRUCTURE DE TURBULENCE DANS LES FLUIDES NON NEWTONIENS written by CLAUDE.. BERNER and published by . This book was released on 1980 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: ETUDE EXPERIMENTALE DE LA REDUCTION DE FROTTEMENT. MISE EN EVIDENCE DE L'INFLUENCE DES MACROMOLECULES SUR LE CHANGEMENT DE STRUCTURE DE LA TURBULENCE. DETERMINATION DES PROFILS DE VITESSE MOYENNE ET DES INTENSITES DE TURBULENCE A MEME NOMBRE DE REYNOLDS. ETUDE DES DENSITES DE PROBABILITE, DENSITES SPECTRALES DE PUISSANCE, AUTOCORRELATION ET VARIATIONS DES MICRO-ECHELLES

Download or read book Non perturbative Methods in Statistical Descriptions of Turbulence written by Jan Friedrich and published by Springer Nature. This book was released on 2020-09-25 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive overview of statistical descriptions of turbulent flows. Its main objectives are to point out why ordinary perturbative treatments of the Navier–Stokes equation have been rather futile, and to present recent advances in non-perturbative treatments, e.g., the instanton method and a stochastic interpretation of turbulent energy transfer. After a brief introduction to the basic equations of turbulent fluid motion, the book outlines a probabilistic treatment of the Navier–Stokes equation and chiefly focuses on the emergence of a multi-point hierarchy and the notion of the closure problem of turbulence. Furthermore, empirically observed multiscaling features and their impact on possible closure methods are discussed, and each is put into the context of its original field of use, e.g., the renormalization group method is addressed in relation to the theory of critical phenomena. The intended readership consists of physicists and engineers who want to get acquainted with the prevalent concepts and methods in this research area.

Download or read book Comportement des paliers fluides en coulement turbulent de fluides non newtoniens written by Mohamed Hocine and published by . This book was released on 1990 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: DANS CE MEMOIRE, NOUS AVONS DEVELOPPE L'ETUDE DES COMPORTEMENTS DES FLUIDES, A GRANDES VITESSES DE ROTATION; CAR LA THEORIE DE REYNOLDS LAMINAIRE N'EST PLUS EXPLOITABLE. L'ELABORATION D'UNE THEORIE QUI PERMET L'APPROCHE DES CARACTERISTIQUES DES PALIERS LUBRIFIES PAR DES FLUIDES NON NEWTONIENS, DOIT REPOSER SUR LA LOI FONDAMENTALE DU COMPORTEMENT DU FLUIDE CORRESPONDANT; OR, POUR LES FLUIDES NON NEWTONIENS IL N'EXISTE PAS DE LOI DE COMPORTEMENT UNIVERSELLE. COMPTE TENU QUE LA LOI CHOISIE DOIT INTERAGIR AVEC LE PHENOMENE DE TURBULENCE; IL EST INDISPENSABLE QUE CETTE LOI PRESENTE UNE EXPRESSION MATHEMATIQUE RELATIVEMENT SIMPLE. NOUS AVONS DONC SELECTIONNE LA LOI EN PUISSANCE (LAW OF POWER). DANS UNE SECONDE ETAPE NOUS AVONS ABORDE L'ETUDE DE LA TURBULENCE, OR CE PHENOMENE COMPLEXE EST DECRIT PAR PLUSIEURS MODELES, DONT ON A EXPOSE PRINCIPALEMENT CEUX AYANT ETE APPLIQUES AUX PALIERS. IL NOUS SEMBLE QUE LE MODELE K- ET LE MODELE ENERGIE CINETIQUE SONT LES PLUS SATISFAISANTS; ET PERMETTENT L'INTEGRATION FACILE DE LA LOI DE COMPORTEMENT DU FLUIDE CHOISI. LA RESOLUTION NUMERIQUE DE LA TURBULENCE A ETE APPLIQUEE A UN ECOULEMENT PLAN. CETTE PREMIERE SIMULATION DEBOUCHE SUR UNE FORMULATION GENERALISEE DES COEFFICIENTS GX#1 ET GX#3. ENSUITE CES FORMULATIONS SONT INTRODUITES DANS L'EQUATION DE REYNOLDS GENERALISEE, LAQUELLE EST RESOLUE PAR LA TECHNIQUE DES DIFFERENCES FINIES; ET QUI FOURNIT LES CARACTERISTIQUES D'UN PALIER (W, S, , CC,...). CES RESULTATS APRES AVOIR ETE ANALYSES ET INTERPRETES SONT TOUT D'ABORD VALIDES POUR LE CAS NEWTONIEN ET COMPARES AVEC DES TRAVAUX ANTERIEURS

Download or read book Dokumentation Rheologie written by and published by . This book was released on 1985 with total page 930 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Contribution l tude des fluides non newtoniens written by Jean Drykoningen and published by . This book was released on 1970 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ETUDE EXPERIMENTALE DE LA TURBULENCE DE GRILLE EN CONVECTION NATURELLE ANALYSE DES EFFETS NON BOUSSINESQ written by MICHEL.. PAVAGEAU and published by . This book was released on 1994 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: ON ETUDIE LA TURBULENCE DE CONVECTION NATURELLE. POUR IDENTIFIER LES EFFETS DES VARIATIONS DE MASSE VOLUMIQUE SUR LA STRUCTURE DE LA TURBULENCE ET PAR SUITE LES CONSEQUENCES SUR LA FORMULATION STATISTIQUE DES MODELES, UNE ETUDE EXPERIMENTALE EST DEVELOPPEE SUR UN ECOULEMENT DE TURBULENCE DE GRILLE EN CONVECTION NATURELLE. LES DIMENSIONS CARACTERISTIQUES DE L'ECOULEMENT ETUDIE SONT RELATIVEMENT GRANDES ET LES ECARTS DE TEMPERATURE AVEC LE FLUIDE AMBIANT SONT MODERES. SUR LE PLAN THEORIQUE, LES EQUATIONS STATISTIQUES DE LA TURBULENCE SONT ECRITES EN MOYENNE DE REYNOLDS A PARTIR D'UNE ANALYSE DE BILAN PAR ELEMENT DE MASSE ET NON PLUS PAR ELEMENT DE VOLUME. CETTE ECRITURE PERMET D'IDENTIFIER ET D'ISOLER DES TERMES DITS DEVIATOIRES PAR RAPPORT A UNE SITUATION POUR LAQUELLE LE VOLUME VARIERAIT SANS FLUCTUER. LES RESULTATS MONTRENT QUE DANS L'EVOLUTION DU CHAMP DYNAMIQUE MOYEN, CES TERMES SUPPLEMENTAIRES NE JOUENT PAS UN ROLE NOTABLE, LA SITUATION EST DU TYPE BOUSSINESQ. EN RAISON D'UNE DIVERGENCE MOYENNE DE LA VITESSE NON NEGLIGEABLE, ON DOIT EN REVANCHE TENIR COMPTE DES EFFETS DE LA FLUCTUATION DU VOLUME POUR EXPLIQUER L'EVOLUTION DU CHAMP THERMIQUE MOYEN. ON N'OBSERVE PAS LA DECROISSANCE HABITUELLE DE LA TURBULENCE DE GRILLE ET L'ANALYSE DOIT ETRE POUSSEE A CELLE DES TERMES DEVIATOIRES DONT ON MONTRE QUE LE ROLE N'EST PAS NEGLIGEABLE VIS-A-VIS DES MECANISMES PHYSIQUES QUASI INCOMPRESSIBLES ASSOCIES A L'EVOLUTION DE L'ENERGIE DE LA TURBULENCE. LES EFFETS LIES AUX PRESSO-CORRELATIONS SERAIENT AU MOINS DU MEME ORDRE DE GRANDEUR QUE LES EFFETS DES COUPLAGES AVEC LA FLUCTUATION DU VOLUME ET PAR CONSEQUENT IL SEMBLE QUE CES DERNIERS DOIVENT ETRE PRIS EN CONSIDERATION DANS LES MODELES DE FERMETURE DES EQUATIONS POUR LA CONVECTION NATURELLE. L'ESTIMATION DU ROLE JOUE PAR LES TERMES DEVIATOIRES EST MONTREE COMME FORTEMENT DEPENDANTE DE LA DIVERGENCE MOYENNE DE LA VITESSE ET, POUR LE CHAMP THERMIQUE, DU TAUX DE DISSIPATION DE L'ENERGIE MOYENNE DE LA TURBULENCE

Download or read book Contribution l tude des caract res statistiques des fluctuations longitudinales de vitesse et de temp rature dans un coulement turbulent de couche limite written by Jean-Pierre Chiapale and published by . This book was released on 1974 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: ETUDE DE LA STRUCTURE FINE DE LA TURBULENCE, CERTAINS CARACTERES NON GAUSSIENS DES FLUCTUATIONS TURBULENTES CINEMATIQUES ET HERMIQUES SONT PRECISES AU SEIN DE LA COUCHE LIMITE QUI SE DEVELOPPE SUR UNE PLAQUE PLANE LISSE. LES MESURES DE FONCTION DE DISTRIBUTION DES FLUCTUATIONS LONGITUDINALES MONTRENT QUE CE SONT LES GRANDES AMPLITUDES QUI DIFFERENT LE PLUS DE LA LOI DE GAUSS; DE MEME L'ANALYSE DU NOMBRE DE PASSAGES PAR UN SEUIL DONNE. ANALYSE STATISTIQUE DE LA CONTRIBUTION DES DIFFERENTES AMPLITUDES DU SIGNAL TURBULENT. MESURE DES CORRELATIONS SPATIO-TEMPORELLES TRIPLES DIFFERENTES DE ZERO. CONFIRMATION DE LA VALIDITE DU MODELE DE PERTURBATION DE KLINE

Download or read book A Parallel Finite Volume Algorithm for Large eddy Simulation of Turbulent Flows written by Trong T. Bui and published by . This book was released on 1998 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Navier Stokes Equations written by Roger Temam and published by American Mathematical Soc.. This book was released on 2001-04-10 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: Originally published in 1977, the book is devoted to the theory and numerical analysis of the Navier-Stokes equations for viscous incompressible fluid. On the theoretical side, results related to the existence, the uniqueness, and, in some cases, the regularity of solutions are presented. On the numerical side, various approaches to the approximation of Navier-Stokes problems by discretization are considered, such as the finite dereference method, the finite element method, and the fractional steps method. The problems of stability and convergence for numerical methods are treated as completely as possible. The new material in the present book (as compared to the preceding 1984 edition) is an appendix reproducing a survey article written in 1998. This appendix touches upon a few aspects not addressed in the earlier editions, in particular a short derivation of the Navier-Stokes equations from the basic conservation principles in continuum mechanics, further historical perspectives, and indications on new developments in the area. The appendix also surveys some aspects of the related Euler equations and the compressible Navier-Stokes equations. The book is written in the style of a textbook and the author has attempted to make the treatment self-contained. It can be used as a textbook or a reference book for researchers. Prerequisites for reading the book include some familiarity with the Navier-Stokes equations and some knowledge of functional analysis and Sololev spaces.

Download or read book Closure Strategies for Turbulent and Transitional Flows written by Brian Edward Launder and published by Cambridge University Press. This book was released on 2002-02-21 with total page 774 pages. Available in PDF, EPUB and Kindle. Book excerpt: Publisher Description

Download or read book The Large Sieve written by Klaus Friedrich Roth and published by . This book was released on 1969 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Navier Stokes Equations and Nonlinear Functional Analysis written by Roger Temam and published by SIAM. This book was released on 1995-01-01 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: This second edition attempts to arrive as simply as possible at some central problems in the Navier-Stokes equations.

Download or read book Complex Potential Theory written by Paul M. Gauthier and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 565 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the NATO Advanced Study Institute and Séminaire de mathématiques supérieures, Montréal, Canada, July 26--August 6, 1993

Download or read book Convex Analysis and Variational Problems written by Ivar Ekeland and published by SIAM. This book was released on 1999-12-01 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains different developments of infinite dimensional convex programming in the context of convex analysis, including duality, minmax and Lagrangians, and convexification of nonconvex optimization problems in the calculus of variations (infinite dimension). It also includes the theory of convex duality applied to partial differential equations; no other reference presents this in a systematic way. The minmax theorems contained in this book have many useful applications, in particular the robust control of partial differential equations in finite time horizon. First published in English in 1976, this SIAM Classics in Applied Mathematics edition contains the original text along with a new preface and some additional references.

Download or read book Navier Stokes Equations and Turbulence written by C. Foias and published by Cambridge University Press. This book was released on 2001-08-27 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the mathematical theory of turbulence to engineers and physicists, and the physical theory of turbulence to mathematicians. The mathematical technicalities are kept to a minimum within the book, enabling the language to be at a level understood by a broad audience.

Download or read book Theory of the Navier Stokes Equations written by John Groves Heywood and published by World Scientific. This book was released on 1998 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume collects the articles presented at the Third International Conference on ?The Navier-Stokes Equations: Theory and Numerical Methods?, held in Oberwolfach, Germany. The articles are important contributions to a wide variety of topics in the Navier-Stokes theory: general boundary conditions, flow exterior to an obstacle, conical boundary points, the controllability of solutions, compressible flow, non-Newtonian flow, magneto-hydrodynamics, thermal convection, the interaction of fluids with elastic solids, the regularity of solutions, and Rothe's method of approximation.

Download or read book Advances in Acoustic Microscopy written by Andrew Briggs and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the second volume of Advances in Acoustic Microscopy. It continues the aim of presenting applications and developments of techniques that are related to high-resolution acoustic imaging. We are very grateful to the authors who have devoted considerable time to preparing these chapters, each of which describes a field of growing importance. Laboratories that have high-performance acoustic microscopes are frequently asked to examine samples for which the highest available resolution is not necessary, and the ability to penetrate opaque layers is more significant. Such applications can be thought of as bridging the gap be tween acoustic microscopy at low gigahertz frequencies, and on the one hand nondestructive testing of materials at low megahertz frequencies and on the other hand medical ultrasonic imaging at low megahertz frequencies. Commercial acoustic microscopes are becoming increasingly available and popular for such applications. We are therefore delighted to be able to begin the volume with chapters from each of those two fields. The first chapter, by Gabriele Pfannschmidt, describes uses of acoustic microscopy in the semiconductor industry. It provides a splendid balance to the opening chapter of Volume 1, which came from a national research center, being written from within a major European electronics industry itself. Dr Pfann schmidt describes the use of two quite different types of acoustic microscopes, and points out the advantages of each for specific purposes.