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Modelisation Numerique Des Phenomenes Non Lineaires Acoustiques En Fluide Thermovisqueux
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Book Synopsis Modélisation numérique des phénomènes non linéaires acoustiques en fluide thermovisqueux by : Abdennour Boufermel
Download or read book Modélisation numérique des phénomènes non linéaires acoustiques en fluide thermovisqueux written by Abdennour Boufermel and published by . This book was released on 2010 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: La propagation acoustique à fort niveau s'accompagne généralement de phénomènes secondaires non linéaires. Parmi ces phénomènes, la génération d'écoulements secondaires redressés et le transfert de chaleur induit par l'acoustique (processus thermoacoustique) font l'objet du travail présenté dans ce mémoire de thèse. Plus précisément, l’objet du mémoire est de présenter et de valider une formulation théorique adaptée à la modélisation numérique des phénomènes non linéaires à partir de codes de calcul usuels, avec un minimum d’approximations. Les écoulements redressés et l’effet thermoacoustique présentant des échelles de temps grandes devant la période acoustique, la description théorique est réalisée sur la base d’une séparation des échelles de temps : (i) calcul du champ acoustique oscillant en régime harmonique au cours de la période acoustique, en tenant compte des effets de couches limites thermique et visqueuse, (ii) recherche des solutions des équations de conservation qui décrivent les phénomènes non linéaires lents, en utilisant la vitesse de transport de masse comme variable. L’usage de cette variable permet aux équations de conserver une forme classique en dynamique des fluides, les effets non linéaires étant traduits par différents termes sources aux seconds membres de ces équations. Cette modélisation numérique est appliquée à l’étude de machines thermoacoustiques de deux types (machine à onde progressive, machine à onde stationnaire), à l'intérieur desquelles les écoulements redressés et les transferts thermiques sont analysés séparément. Après validation sur des configurations particulières correspondant à des études analytiques antérieures, des résultats originaux sont présentés, concernant notamment l’effet de la courbure d'un résonateur annulaire sur l’écoulement redressé ou encore l’insertion d’un empilement de plaques solides fines (stack) à l’intérieur du résonateur.
Book Synopsis Modélisation numérique des problèmes aux limites de l'acoustique linéaire en fluide thermovisqueux by : Romain Bossart
Download or read book Modélisation numérique des problèmes aux limites de l'acoustique linéaire en fluide thermovisqueux written by Romain Bossart and published by . This book was released on 2001 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les phénomènes thermovisqueux mis en jeu au cours de la propagation acoustique, en domaines bornés ou non, nécessitent depuis près d’une décennie d’être pris en compte dans les modèles numériques, afin de traiter de larges éventails de problèmes, en particulier le calcul des champs en domaines confinés, et la modélisation numérique des interactions thermiques et vibratoires avec les parois. La dissipation thermovisqueuse ne peut pas être introduite dans les codes numériques en usage en acoustique puisque la formulation sur laquelle ils reposent ne permet pas de décrire les champs qui prennent place notamment dans les couches limites thermique et visqueuse, le caractère indivergent des phénomènes tourbillonnaires étant incompatible avec la formulation potentielle sur laquelle reposent ces codes. L’objet de ce travail est de proposer deux approches pour modéliser numériquement les phénomènes thermovisqueux, aussi bien au sein du fluide que dans les couches limites pariétales. La première approche fait intervenir une méthode hybride numérique/analytique. Elle repose sur les codes numériques de l’acoustique, la modélisation des effets liés à la viscosité, hors et dans les couches limites, étant introduite par un ensemble de post-traitements appropriés. La seconde approche fait usage de codes numériques issus de la thermomécanique des milieux continus, qui incluent la modélisation des mouvements indivergents. Elle repose sur un système d’équations couplées portant sur les variables écart instantané de température et vitesse particulaire, issues des équations fondamentales de l’acoustique linéaire en fluide dissipatif. Cette approche permet de traiter non seulement des problèmes où les conditions aux frontières sont classiques, parois thermostatiques et conditions d’adhérence, qui font intervenir les deux variables choisies, mais encore un éventail plus large de problèmes où le couplage vibro-thermo-acoustique fluide/paroi doit être pris en compte (applications en vibro- et thermo-acoustique). Dans le travail effectué, la validation de ces approches reste inachevée, priorité en fin d’étude étant accordée à la réalisation d’un système microphonique micro-usiné sur silicium, approche de microphones miniatures à géométries complexes qui devront être modélisés de façon numérique pour en améliorer les caractéristiques.
Book Synopsis MODELISATION NUMERIQUE DES PHENOMENES DE TRANSPORT DE CHALEUR ET DE MASSE DANS LES FLUIDES SUPERCRITIQUES by : SAKIR.. AMIROUDINE
Download or read book MODELISATION NUMERIQUE DES PHENOMENES DE TRANSPORT DE CHALEUR ET DE MASSE DANS LES FLUIDES SUPERCRITIQUES written by SAKIR.. AMIROUDINE and published by . This book was released on 1995 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt: IL A ETE RECEMMENT MONTRE DURANT LES EXPERIENCES SPATIALES ET PAR DES CONSIDERATIONS THEORIQUES QUE LE TRANSFERT DE CHALEUR A PROXIMITE DU POINT CRITIQUE LIQUIDE VAPEUR SE FAISAIT PAR LE MECANISME DE L'EFFET PISTON. EN EFFET, LA TRES FORTE EXPANSION DE LA FINE COUCHE LIMITE INITIALE ENTRAINE, PAR UN PROCESSUS ADIABATIQUE, UNE AUGMENTATION RAPIDE DE LA TEMPERATURE DANS LE RESTE DU FLUIDE PAR LE BIAIS DU VA-ET-VIENT DES ONDES ACOUSTIQUES. DANS CE PRESENT TRAVAIL SONT EXPLORES LES MECANISMES DE TRANSPORT DE MASSE ET DE CHALEUR DANS UNE CAVITE RECTANGULAIRE CHAUFFEE PAR LE COTE, REMPLIE D'UN FLUIDE SUPERCRITIQUE, ET LA COMPETITION ENTRE LA CONVECTION NATURELLE ET L'EFFET PISTON (OU CONVECTION THEROACOUSTIQUE). LES EQUATIONS DE NAVIER-STOKES POUR UN FLUIDE PROCHE DE SON POINT CRITIQUE, SUIVANT UNE LOI D'ETAT DE TYPE VAN DER WAALS, SONT RESOLUES NUMERIQUEMENT PAR LA METHODE DES VOLUMES FINIS AVEC LA PROCEDURE DE FILTRAGE ACOUSTIQUE. LES RESULTATS ONT ETE SURPRENANTS COMPARES A CEUX D'UN FLUIDE PARFAIT: I) L'EQUILIBRATION EN TEMPERATURE EST TOUJOURS AUSSI RAPIDE QUE DANS LE CAS DE CONDITIONS DE GRAVITE NULLE (SIMULATIONS 1D) PAR EFFET PISTON (AVANT QUE LA CONVECTION NE DEMARRE): II) L'EQUILIBRATION DE LA MASSE SE FAIT SUR UNE ECHELLE DE TEMPS BEAUCOUP PLUS LONGUE PAR LA CONVECTION NATURELLE QUASI-ISOTHERME III) A CAUSE DE LA TRES FORTE COMPRESSIBILITE, UN EFFET DE POINT D'ARRET SIMILAIRE A CELUI QUE L'ON RENCONTRE DANS LES ECOULEMENTS A FORTE VITESSE, PROVOQUE UNE SURCHAUFFE DE MUR SUPERIEUR.
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1994 with total page 1224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Basic Concepts for Simple and Complex Liquids by : Jean-Louis Barrat
Download or read book Basic Concepts for Simple and Complex Liquids written by Jean-Louis Barrat and published by Cambridge University Press. This book was released on 2003-03-27 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presenting a unified approach, this book focusses on the concepts and theoretical methods that are necessary for an understanding of the physics and chemistry of the fluid state. The authors do not attempt to cover the whole field in an encyclopedic manner. Instead, important ideas are presented in a concise and rigorous style, and illustrated with examples from both simple molecular liquids and more complex soft condensed matter systems such as polymers, colloids, and liquid crystals.
Book Synopsis On the Continuity of the Gaseous and Liquid States by : J. D. Van Der Waals
Download or read book On the Continuity of the Gaseous and Liquid States written by J. D. Van Der Waals and published by Courier Corporation. This book was released on 2004-01-01 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: This much-cited thesis by J. D. van der Waals, the recipient of the 1910 Nobel Prize in physics, is accompanied by an introductory essay by J. S. Rowlinson and another work by van der Waals on the theory of liquid mixtures. 1988 edition.
Book Synopsis Advances in Hydroinformatics by : Philippe Gourbesville
Download or read book Advances in Hydroinformatics written by Philippe Gourbesville and published by Springer. This book was released on 2015-08-21 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a collection of extended papers based on presentations given during the SIMHYDRO 2014 conference, held in Sophia Antipolis in June 2014. It focuses on the modeling and simulation of fast hydraulic transients, on 3D modeling, and on uncertainties and multiphase flows. The book explores both the limitations and performance of current models and presents the latest developments based on new numerical schemes, high-performance computing, multiphysics and multiscale methods, and better interaction with field or scale model data. It addresses the interests of practitioners, stakeholders, researchers and engineers active in this field.
Book Synopsis A Parallel Finite Volume Algorithm for Large-eddy Simulation of Turbulent Flows by : Trong T. Bui
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 Properties of UO2 written by J. Belle and published by . This book was released on 1957 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genmix written by D Brian Spalding and published by Elsevier. This book was released on 2014-05-18 with total page 393 pages. Available in PDF, EPUB and Kindle. Book excerpt: Genmix: A General Computer Program for Two-dimensional Parabolic Phenomena explains a computer program called GENMIX. The main intention of the program is to be used as a tool of instructions. The name of the program is a mixture of two considerations: its generality and its concern for mixing processes. The book aims to help the potential user to understand the physical and mathematical basis of the topic computer program. It is also the aim of the book to make the program applicable to practical problems. The book is arranged in such a way as to parallel a course of lectures and associated computer-workshop sessions wherein the student is allowed to do some elementary computations as soon as he has gained some knowledge of the method. The book contains the mathematical, physical, and computer-coding aspects of the program. Concepts such as the boundary layer, two-dimensional, and steady- flow are defined and discussed in depth. The text will be a useful tool for computer instructors and students.
Author :International Atomic Energy Agency Publisher :International Atomic Energy Agency ISBN 13 :9789201063205 Total Pages :72 pages Book Rating :4.0/5 (632 download)
Book Synopsis In-Vessel Melt Retention and Ex-Vessel Corium Cooling: IAEA Tecdoc No. 1906 by : International Atomic Energy Agency
Download or read book In-Vessel Melt Retention and Ex-Vessel Corium Cooling: IAEA Tecdoc No. 1906 written by International Atomic Energy Agency and published by International Atomic Energy Agency. This book was released on 2020-08-06 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication results from a technical meeting on phenomenology and technologies relevant to in-vessel melt retention (IVMR) and ex-vessel corium cooling (EVCC). The purpose of the publication is to capture the state of knowledge, at the time of that meeting, related to phenomenology and technologies as well as the challenges and pending issues relevant to IVMR and EVCC for water cooled reactors by summarizing the information provided by the meeting participants in a form useful to practitioners in Member States.
Book Synopsis Solar Chimney Power Plant Generating Technology by : Tingzhen Ming
Download or read book Solar Chimney Power Plant Generating Technology written by Tingzhen Ming and published by Academic Press. This book was released on 2016-03-15 with total page 247 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solar Chimney Power Plant Generating Technology presents the latest advanced solar chimney power generating technologies to help engineers acquire a comprehensive understanding of the fundamental theories, technologies, and applications of solar chimney power generating systems. The book includes comprehensive theories, very detailed technologies, and many well-illustrated, basic configurations of different types of systems, enabling readers to understand the fundamental theory, the design methods of solar chimney systems, and the basic parameters of the construction and operation of these systems. - Includes comprehensive theories, very detailed technologies, and many basic configurations of different types of systems - Covers the basic mechanisms of fluid flow, heat transfer, power output, energy storage, and operational procedures of SCPPS (solar chimney power plant system) turbines - Focuses on thermodynamic theory, helio-aero-gravity effect, fluid flow and heat transfer characteristics, design for SC turbine, energy storage, and the effect of ambient crosswinds
Book Synopsis Dynamic Behavior of Materials, Volume 1 by : Bo Song
Download or read book Dynamic Behavior of Materials, Volume 1 written by Bo Song and published by Springer. This book was released on 2015-10-23 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamic Behavior of Materials, Volume 1 represents the first of nine volumes of technical papers presented at the Society for Experimental Mechanics SEM 15th International Congress & Exposition on Experimental and Applied Mechanics, held at Costa Mesa, California, June 8-11, 2015. The full set of proceedings also includes volumes on: Challenges in Mechanics of Time Dependent Materials, Advancement of Optical Methods in Experimental Mechanics, Experimental and Applied Mechanics 16th International Symposium on MEMS and Nanotechnology, 5th International Symposium on the Mechanics of Biological Systems and Materials, International Symposium on the Mechanics of Composite and Multi-functional Materials, Fracture, Fatigue, Failure and Damage Evolution; and Residual Stress, Thermomechanics & Infrared Imaging, Hybrid Techniques and Inverse Problems.
Book Synopsis Fundamentals of Atmospheric Physics by : Murry L. Salby
Download or read book Fundamentals of Atmospheric Physics written by Murry L. Salby and published by Elsevier. This book was released on 1996-05-23 with total page 661 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fundamentals of Atmospheric Physics emphasizes the interrelationships of physical and dynamical meteorology. The text unifies four major subject areas: atmospheric thermodynamics, hydrostatic equilibrium and stability, atmospheric radiation and clouds, and atmospheric dynamics. These fundamental areas serve as cornerstones of modern atmospheric research on environmental issues like global change and ozone depletion. Physical concepts underlying these subject areas are developed from first principles, providing a self-contained text for students and scholars from diverse backgrounds. The presentation is Lagrangian (single-body problems) in perspective, with a balance of theory and application. Each chapter includes detailed and extensive problems; selected answers are provided, as are appendices of various constants. The text requires a thorough foundation in calculus. - Presents a comprehensive introduction to atmospheric thermodynamics, hydrostatics, radiation and clouds, and dynamics - Develops concepts from first principles, providing a self-contained volume for readers from diverse backgrounds - Emphasizes the interaction of physical processes shaping global problems of atmospheric energetics, transport, and chemistry - Provides a balance of theory and applications, with examples drawn from a wide range of phenomena figuring in global atmospheric research - Extensively illustrated with global satellite imagery and analyses and photographs of laboratory simulations - Exercises apply to a wide range of topical problems
Book Synopsis Combustion and Flames by : Roland Borghi
Download or read book Combustion and Flames written by Roland Borghi and published by Editions Technips. This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Professionals working in the field of combustion may well find many points of interest, highlighted by the book's logical and global approach to phenomena, which considers mechanical, thermal and chemical aspects simultaneously. The book prioritises an understanding of the physical and chemical aspects of the phenomena, and lays particular emphasis on experimental analyses and modern numerical simulations, and on the way in which these phenomena are translated into equations.Contents: Introduction: Discovering combustion and flames. 1. Combustion thermodynamics. 2. Chemical kinetics applied to combustion. 3. Mass and energy transport by convection and diffusion. 4. Self-ignitions in closed systems. 5. Laminar flames and deflagrations. 6. Turbulent flames and deflagrations. 7. Detonation and supersonic combustion. 8. Flame ignition. 9. Combustion of liquids and sprays. 10. Pollutant emissions in combustion reactions. Index.
Book Synopsis Heat and Mass Transfer in Boundary Layers by : Suhas V. Patankar
Download or read book Heat and Mass Transfer in Boundary Layers written by Suhas V. Patankar and published by . This book was released on 1970 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Vortex Dominated Flows by : Denis L. Blackmore
Download or read book Vortex Dominated Flows written by Denis L. Blackmore and published by World Scientific. This book was released on 2005 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: Honoring the contributions of one of the field's leading experts, Lu Ting, this indispensable volume contains important new results at the cutting edge of research. A wide variety of significant new analytical and numerical results in critical areas are presented, including point vortex dynamics, superconductor vortices, cavity flows, vortex breakdown, shock/vortex interaction, wake flows, magneto-hydrodynamics, rotary wake flows, and hypersonic vortex phenomena.The book will be invaluable for those interested in the state of the art of vortex dominated flows, both from a theoretical and applied perspective.Professor Lu Ting and Joe Keller have worked together for over 40 years. In their first joint work entitled ?Periodic vibrations of systems governed by nonlinear partial differential equations?, perturbation analysis and bifurcation theory were used to determine the frequencies and modes of vibration of various physical systems. The novelty was the application to partial differential equations of methods which, previously, had been used almost exclusively on ordinary differential equations. Professsor Lu Ting is an expert in both fluid dynamics and the use of matched asymptotic expansions. His physical insight into fluid flows has led the way to finding the appropriate mathematical simplications used in the solutions to many difficult flow problems.
