Download or read book DEVELOPPEMENT DE METHODES DE CALCULS EFFICACES POUR DES ECOULEMENTS INSTATIONNAIRES EN GEOMETRIE DEFORMABLE written by REGIS.. MARTIN and published by . This book was released on 1996 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: LE TRAVAIL PRESENTE DANS CETTE THESE PORTE SUR LE DEVELOPPEMENT DE METHODES DE RESOLUTION NUMERIQUE POUR LA SIMULATION D'ECOULEMENTS INSTATIONNAIRES COMPRESSIBLES A FAIBLE NOMBRE DE MACH. LES DIFFICULTES DE CE TYPE DE SIMULATION PROVIENNENT DE LA RAIDEUR DU PROBLEME (PETIT MACH), DE LONG TEMPS DE SIMULATION ET DE LA GEOMETRIE SOUMISE A DE FORTES DEFORMATIONS AU COURS DU TEMPS. LA BASE DES METHODES REPOSE SUR L'UTILISATION DE SCHEMAS IMPLICITES EN TEMPS ET D'UNE DISCRETISATION MIXTE ELEMENTS FINIS-VOLUMES FINIS EN MAILLAGES NON-STRUCTURES. LA PREMIERE PARTIE DE LA THESE PORTE SUR L'ETUDE DE SCHEMAS IMPLICITES PLUS PRECIS. NOUS PROPOSONS DONC UNE METHODE POUR CALCULER LES PARAMETRES GEOMETRIQUES (AFIN DE VERIFIER LES LOIS DE CONSERVATION) POUR UN SCHEMA EN TEMPS MULTI-PAS. PAR LA SUITE, NOUS DEVELOPPONS UN ALGORITHME EFFICACE DE RESOLUTION D'EQUATIONS PROVENANT D'UN SCHEMA D'ORDRE ELEVE, A PARTIR DE SCHEMA D'ORDRE PLUS FAIBLE, MAIS DONT LE SYSTEME EST MIEUX CONDITIONNE. ON MONTRE ALORS QU'IL SUFFIT DE RESOUDRE UN NOMBRE FINI DE SYSTEMES LINEAIRES SIMPLES POUR OBTENIR LA SOLUTION DU PROBLEME INITIAL. NOUS APPLIQUONS ENSUITE CETTE METHODE DANS LE CAS DU SCHEMA IMPLICITE D'ORDRE 2 DE GEAR. CECI NOUS PERMET ALORS DE METTRE EN EVIDENCE TOUT L'INTERET D'UTILISER DES SCHEMAS PLUS PRECIS EN TEMPS (MOINS DE CALCUL). LA DEUXIEME PARTIE DE CETTE THESE SE CONSACRE A L'ETUDE ET L'ANALYSE D'UNE METHODE MULTIGRILLE POUR LA RESOLUTION DES EQUATIONS DE NAVIER-STOKES INSTATIONNAIRES EN DEFORMABLE. CETTE METHODE INTERVIENT POUR LE CALCUL DE LA DEFORMATION DU MAILLAGE AU COURS DU TEMPS ET POUR LA RESOLUTION DES SYSTEMES LINEAIRES PROVENANT DE LA DISCRETISATION DES EQUATIONS DE NAVIER-STOKES. ENFIN, NOUS COMPARONS AVEC UN SOLVEUR MONOGRILLE, LES PERFORMANCES DE CETTE ALGORITHME

Download or read book D veloppement de m thodes de calcul efficaces pour des coulements instationnaires en g om trie d formable written by Régis Martin (mathématicien)) and published by . This book was released on 1996* with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book DEVELOPPEMENT D UNE METHODE DE PSEUDO COMPRESSIBILITE POUR LE CALCUL DES ECOULEMENTS DE FLUIDE INCOMPRESSIBLE APPLICATIONS AUX ECOULEMENTS INSTATIONNAIRES EN PRESENCE D UNE SURFACE LIBRE written by CHRISTINE.. DE JOUETTE CALM and published by . This book was released on 1994 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: UNE METHODE DE PSEUDO-COMPRESSIBILITE EST DEVELOPPEE POUR RESOUDRE LES EQUATIONS STATIONNAIRES D'EULER OU DE NAVIER-STOKES DE FLUIDE INCOMPRESSIBLE. PLUSIEURS FORMULATIONS PSEUDO-INSTATIONNAIRES CONSERVATIVES, CONDUISANT A DES SYSTEMES HYPERBOLIQUES DANS LE CAS DE FLUIDES NON VISQUEUX, ONT ETE ETUDIEES ET LEURS PERFORMANCES COMPAREES SUR DES CALCULS D'ECOULEMENTS AUTOUR DE PROFILS. LA METHODE DE RESOLUTION DU SYSTEME PSEUDO-INSTATIONNAIRE RETENU EST CARACTERISEE PAR UNE DISCRETISATION CENTREE EN ESPACE, DE TYPE VOLUMES FINIS, DES TERMES DE VISCOSITE ARTIFICIELLE, UN SCHEMA DE RUNGE-KUTTA APPLIQUE AU PSEUDO-TEMPS. CETTE METHODE EST ENSUITE ETENDUE AU CALCUL D'ECOULEMENTS INSTATIONNAIRES, EN PRESENCE D'UNE SURFACE LIBRE. UNE METHODE DE DEFORMATION DE MAILLAGE, BASEE SUR UNE FONCTION HAUTEUR, PERMET UN SUIVI NON LINEAIRE DE CETTE SURFACE. LE CARACTERE HYPERBOLIQUE DU SYSTEME PSEUDO-INSTATIONNAIRE AUTORISE UN TRAITEMENT DES FRONTIERES DU DOMAINE DE CALCUL AU MOYEN DES RELATIONS DE COMPATIBILITE QUE L'ON COMPLETE PAR DIFFERENTES CONDITIONS AUX LIMITES. UN CODE DE CALCUL A ETE CONCU POUR ETUDIER DES ECOULEMENTS TRIDIMENSIONNELS, MAIS SA VALIDATION NE CONCERNE QUE DES APPLICATIONS BIDIMENSIONNELLES

Download or read book UNE METHODE DE PROJECTION PARALLELE POUR LA RESOLUTION DES EQUATIONS DE NAVIER STOKES APPLICATION A L APPROXIMATION SPECTRALE DES ECOULEMENTS INTER DISQUES written by ANAS.. BEN MAMOUN and published by . This book was released on 1997 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt: LE DEVELOPPEMENT ET L'ANALYSE D'ALGORITHMES RAPIDES ET EFFICACES POUR LA SIMULATION D'ECOULEMENTS INSTATIONNAIRES DE FLUIDES GOUVERNES PAR LES EQUATIONS DE NAVIER-STOKES INCOMPRESSIBLES REPRESENTE L'UNE DES PREOCCUPATIONS MAJEURES COMMUNE AUX NUMERICIENS ET AUX MECANICIENS DE FLUIDES. CEPENDANT, DANS PLUSIEURS CONFIGURATIONS D'INTERET PRATIQUE TELLES QUE LES ECOULEMENTS INTER-DISQUES, LA DETERMINATION DES STRUCTURES D'ECOULEMENTS DEMEURE ENCORE UN PROBLEME LARGEMENT OUVERT, EN PARTICULIER EN RAISON DES LIMITES IMPOSEES PAR LES MODELES NUMERIQUES ET LES MOYENS DE CALCUL. L'APPORT DE CETTE ETUDE, EST ESSENTIELLEMENT DE PROPOSER UN OUTIL QUI PERMET D'ACCROITRE LA PRECISION ET DE REDUIRE LES TEMPS DE CALCUL AFIN DE POUSSER UN PEU PLUS LES LIMITES DU MODELE NUMERIQUE POUR POUVOIR EXPLORER DES CONFIGURATIONS D'ECOULEMENTS QUI JUSQUE LA ETAIENT PROHIBITIFS EN CAPACITE MEMOIRE ET TEMPS DE CALCUL. L'IDEE DEVELOPPEE ET EXPLOITEE DANS CE TRAVAIL REPOSE SUR UNE ADAPTATION ADEQUATE ET PRATIQUE DES METHODES DE PROJECTION POUR UNE IMPLEMENTATION EFFICACE SUR LES MACHINES PARALLELES, IL S'AGIT D'UNE METHODE DE DECOMPOSITION DE DOMAINES DITE A PROJECTION LOCALE. LES METHODES DE PROJECTION ONT ETE INTRODUITES INITIALEMENT, PAR CHORIN ET TEMAM, POUR DECOUPLER LES OPERATEURS DE DIFFUSION ET D'INCOMPRESSIBILITE LORS DE L'INTEGRATION DES EQUATIONS DE STOKES INSTATIONNAIRES EN PROCEDANT EN DEUX ETAPES DITES DE PREDICTION ET DE CORRECTION. LA METHODE QUE L'ON PROPOSE EST BASEE SUR LA BONNE APPROXIMATION REALISEE PAR LA VITESSE INTERMEDIAIRE RESULTANT DE L'ETAPE DE PREDICTION. A CETTE VITESSE ON IMPOSE, EN PLUS DES CONTRAINTES USUELLES DE CONTINUITE H#1 SUR L'INTERFACE ENTRE LES SOUS-DOMAINES, UNE CONTRAINTE GLOBALE DE FLUX DE MASSE PERMETTANT A L'ETAPE DE PROJECTION D'ETRE BIEN POSEE SUR CHACUN DES SOUS-DOMAINES, ET PAR CONSEQUENT UNE RESOLUTION LOCALE DE LA PRESSION A CETTE ETAPE SANS AUCUNE COMMUNICATION ENTRE LES SOUS-DOMAINES.

Download or read book Acoustics Aeroacoustics and Vibrations written by Fabien Anselmet and published by John Wiley & Sons. This book was released on 2016-01-07 with total page 529 pages. Available in PDF, EPUB and Kindle. Book excerpt: This didactic book presents the main elements of acoustics, aeroacoustics and vibrations. Illustrated with numerous concrete examples linked to solid and fluid continua, Acoustics, Aeroacoustics and Vibrations proposes a selection of applications encountered in the three fields, whether in room acoustics, transport, energy production systems or environmental problems. Theoretical approaches enable us to analyze the different processes in play. Typical results, mostly from numerical simulations, are used to illustrate the main phenomena (fluid acoustics, radiation, diffraction, vibroacoustics, etc.).

Download or read book Flow Sensing in Air and Water written by Horst Bleckmann and published by Springer Science & Business Media. This book was released on 2014-01-22 with total page 558 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, leading scientists in the fields of sensory biology, neuroscience, physics and engineering explore the basic operational principles and behavioral uses of flow sensing in animals and how they might be applied to engineering applications such as autonomous control of underwater or aerial vehicles. Although humans possess no flow-sensing abilities, countless aquatic (e.g. fish, cephalopods and seals), terrestrial (e.g. crickets and spiders) and aerial (e.g. bats) animals have flow sensing abilities that underlie remarkable behavioral feats. These include the ability to follow silent hydrodynamic trails long after the trailblazer has left the scene, to form hydrodynamic images of their environment in total darkness, and to swim or fly efficiently and effortlessly in the face of destabilizing currents and winds.

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.

Download or read book The Theory of Ionization of Gases by Collision written by Sir John Townsend and published by . This book was released on 1910 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Principles of Enhanced Heat Transfer written by Ralph L. Webb and published by Wiley-Interscience. This book was released on 1994-03-28 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: Indeed, today "second generation" enhancement concepts are routing in the automotive and refrigeration industries to obtain lower cost, smaller heat exchanger size, and higher energy efficiency in system operation. And the aerospace, process, and power generation industries are not far behind.

Download or read book Chaos and Integrability in Nonlinear Dynamics written by Michael Tabor and published by Wiley-Interscience. This book was released on 1989-01-18 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents the newer field of chaos in nonlinear dynamics as a natural extension of classical mechanics as treated by differential equations. Employs Hamiltonian systems as the link between classical and nonlinear dynamics, emphasizing the concept of integrability. Also discusses nonintegrable dynamics, the fundamental KAM theorem, integrable partial differential equations, and soliton dynamics.

Download or read book Aircraft Fire Safety written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Propulsion and Energetics Panel. Symposium and published by . This book was released on 1997 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Reacting Flows Combustion and Chemical Reactors written by G. S. S. Ludford and published by American Mathematical Soc.. This book was released on 1986 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: Represents the culmination of the Special Year '84-'85 in Reacting Flows held at Cornell University. This work focuses on both mathematical and computational questions in combustion and chemical reactors. It is suitable for researchers and graduate students in the theory of reacting flows.

Download or read book Auxiliary power systems papers presented at the Propulsion and Energetics Panel 61st B specialists meeting held in Copenhagen Denmark 30 31 May 1983 written by AGARD. and published by . This book was released on with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Heat Transfer and Cooling in Gas Turbines written by and published by . This book was released on 1985 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Transonic and Supersonic Phenomena in Turbomachines written by and published by . This book was released on 1987 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mechanics Of Composite Materials written by Robert M. Jones and published by CRC Press. This book was released on 2018-10-08 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book balances introduction to the basic concepts of the mechanical behavior of composite materials and laminated composite structures. It covers topics from micromechanics and macromechanics to lamination theory and plate bending, buckling, and vibration, clarifying the physical significance of composite materials. In addition to the materials covered in the first edition, this book includes more theory-experiment comparisons and updated information on the design of composite materials.