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Etude Numerique De La Methode Des Volumes Finis Cell Center Implicite Pour Les Systemes Conservatifs
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Book Synopsis ETUDE NUMERIQUE DE LA METHODE DES VOLUMES-FINIS CELL-CENTER IMPLICITE POUR LES SYSTEMES CONSERVATIFS by : CATHERINE.. LINDER
Download or read book ETUDE NUMERIQUE DE LA METHODE DES VOLUMES-FINIS CELL-CENTER IMPLICITE POUR LES SYSTEMES CONSERVATIFS written by CATHERINE.. LINDER and published by . This book was released on 1998 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: CE TRAVAIL PORTE SUR L'APPROXIMATION NUMERIQUE DE SYSTEMES CONSERVATIFS PAR LA METHODE DES VOLUMES FINIS CELL-CENTER. ON ETUDIE PLUS PARTICULIEREMENT LA VERSION IMPLICITE EN TEMPS DE CETTE METHODE ET ON LA MET EN UVRE SUR TROIS SYSTEMES : L'EQUATION DE CONVECTION-DIFFUSION, LES EQUATIONS D'EULER COMPRESSIBLES ET LES EQUATIONS DE LA MAGNETOHYDRODYNAMIQUE COMPRESSIBLE. ON COMMENCE PAR RAPPELER EN DETAIL LE PRINCIPE DE L'APPROXIMATION SPATIALE CELL-CENTER DANS SES VARIANTES D'ORDRE 1 ET 2. PLUSIEURS FORMULES DE FLUX NUMERIQUE SONT PRESENTEES POUR LES TROIS SYSTEMES. NOUS ETUDIONS ENSUITE LA VERSION IMPLICITE EN TEMPS DE LA METHODE DONT LE BUT EST CLASSIQUEMENT D'ACCELERER LA CONVERGENCE EN AUGMENTANT LE PAS DE TEMPS. EN CONTREPARTIE, LA LINEARISATION DU SCHEMA IMPLICITE DEMANDE LA RESOLUTION A CHAQUE PAS DE TEMPS D'UN SYSTEME LINEAIRE DONT LA MATRICE EST LE JACOBIEN DU FLUX. LE SYSTEME EST PRECONDITIONNE PAR UNE FACTORISATION INCOMPLETE ILU(0) PUIS RESOLU PAR UNE METHODE DE KRYLOV ITERATIVE, BI-CGSTAB OU GMRES. LE PAS DE TEMPS EST AUGMENTE PROGRESSIVEMENT AU COURS DES ITERATIONS SELON DIFFERENTES STRATEGIES CFL. LA METHODE AINSI MISE EN UVRE EST EVALUEE NUMERIQUEMENT SUR PLUSIEURS CAS TESTS : L'EQUATION DE CONVECTION-DIFFUSION, LES EQUATIONS D'EULER SUR PLUSIEURS CAS CLASSIQUES EN AERODYNAMIQUE (REFLEXION DE CHOCS DE COLLELA ET ECOULEMENTS TRANSSONIQUES AUTOUR DU PROFIL NACA012). CES CAS METTENT EN EVIDENCE UNE SUPERIORITE EN TEMPS CPU DE LA VERSION IMPLICITE DU SCHEMA PAR RAPPORT AU SCHEMA EXPLICITE A PAS DE TEMPS LOCAL, POUR DES STRATEGIES CFL BIEN CHOISIES. DANS LE CAS DES EQUATIONS DE LA MHD, NOUS COMPARONS DEUX FORMULES DE FLUX (FLUX CINETIQUE ET FLUX DE TYPE ROE) SUR DES CAS 1D DE TUBE A CHOCS. PUIS NOUS PRESENTONS UN PREMIER TEST IMPLICITE QUI CONSISTE EN UNE ADAPTATION A LA MHD DU CAS AERODYNAMIQUE DE LA DOUBLE RAMPE. LE SCHEMA IMPLICITE EST ROBUSTE ET DONNE DE BONS RESULTATS EN TEMPS CPU.
Book Synopsis Schémas volumes finis pour la simulation numérique de problèmes à fronts raides en maillages non structurés adaptatifs by : Imad El Mahi
Download or read book Schémas volumes finis pour la simulation numérique de problèmes à fronts raides en maillages non structurés adaptatifs written by Imad El Mahi and published by . This book was released on 1999 with total page 227 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette thèse est consacrée a l'étude numérique de systèmes de lois de conservation bidimensionnelles modélisant des écoulements instationnaires à fronts raides. La démarche adoptée ici est celle des volumes finis cell-centered, sur maillages non structures. Deux modèles sont considérés : l'inflammation d'une goutte, et l'écoulement de l'eau peu profonde couple au transport-diffusion du polluant. Concernant le premier modèle, la raideur spatiale et temporelle du phénomène est prise en compte par l'utilisation d'un procède de raffinement-déraffinement dynamique du maillage. La partie visqueuse des équations est discrétisée à l'aide d'une reconstruction du type green-gauss basée sur la cellule diamant et une interpolation aux moindres carres. Cette technique s'est révélée très efficace lorsque des maillages adaptatifs sont utilisés. Enfin, en considérant une loi de conservation scalaire bidimensionnelle, nous montrons que, sous une condition du type cfl qui est raisonnable, le schéma d'ordre deux utilisé pour la partie convective satisfait le principe du maximum. Nous mettons en évidence ici la propagation d'une flamme triple au cours du processus d'allumage d'une goutte, quand la réaction chimique est suffisamment rapide par rapport au processus de diffusion moléculaire et de diffusion de la température. Pour l'écoulement de l'eau peu profonde, nous avons adopté un schéma semi-implicite linéarisé pour le calcul des termes de frottement et une extension du schéma de Bermudez pour les termes de pente. Enfin, dans le cas ou le système de Saint-venant est couplé à l'équation de transport d'une substance polluante, nous avons utilisé le schéma vf4 pour la discrétisation de la partie diffusive sur des maillages non structurés triangulaires. Plusieurs tests numériques et comparaisons avec des résultats expérimentaux, en une et deux dimensions d'espace, sont réalisés.
Book Synopsis Etude de schémas décentrés implicites pour le calcul numérique en mécanique des fluides. Résolution par décomposition de domaine by : Sébastien Clerc
Download or read book Etude de schémas décentrés implicites pour le calcul numérique en mécanique des fluides. Résolution par décomposition de domaine written by Sébastien Clerc and published by . This book was released on 1997 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: CE TRAVAIL EST CONSACRE A LA SIMULATION NUMERIQUE DES EQUATIONS DE LA MECANIQUE DES FLUIDES COMPRESSIBLES. ON UTILISE DANS CE BUT DES SCHEMAS DE VOLUMES FINIS DECENTRES IMPLICITES. UNE PREMIERE PARTIE EST CONSACREE A L'AMELIORATION DE LA PRECISION DES CALCULS DANS DES SITUATIONS DEFAVORABLES. ON ETUDIE TOUT D'ABORD UN TRAITEMENT DE CERTAINS TERMES SOURCES SOUS UNE FORME NON-CONSERVATIVE QUI PERMET DE CORRIGER CERTAINS DEFAUTS DE LA METHODE DE DECOMPOSITION D'OPERATEUR HABITUELLE. D'AUTRE PART, LES SCHEMAS DE VOLUMES FINIS CONSTRUITS SUR L'APPROCHE DE GODUNOV NE PERMETTENT PAS DE CALCULER DE FACON SATISFAISANTE DES ECOULEMENTS A FAIBLE NOMBRE DE MACH. UNE MODIFICATION DU DECENTREMENT A L'AIDE D'UN PRECONDITIONNEUR PERMET DE CORRIGER DE DEFAUT. LA DEUXIEME PARTIE DE CE TRAVAIL PORTE SUR LA RESOLUTION DU PROBLEME STATIONNAIRE PROVENANT DE LA DISCRETISATION IMPLICITE DES EQUATIONS. ON FORMULE TOUT D'ABORD UN PROBLEME AUX LIMITES LINEARISE BIEN POSE. ON MONTRE LA CONVERGENCE D'UN ALGORITHME DE DECOMPOSITION DE DOMAINE DE TYPE SCHWARZ POUR CE PROBLEME. CET ALGORITHME EST IMPLEMENTE SOIT DIRECTEMENT, SOIT A L'AIDE D'UNE FORMULATION EN COMPLEMENT DE SCHUR. ENFIN, ON PROPOSE UNE ALTERNATIVE CONSISTANT A EFFECTUER LA DECOMPOSITION SUR LE PROBLEME STATIONNAIRE NON-LINEAIRE.
Download or read book Terra 2008 written by Leslie Rainer and published by Getty Publications. This book was released on 2011-06-14 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earthen architecture constitutes one of the most diverse forms of cultural heritage and one of the most challenging to preserve. It dates from all periods and is found on all continents but is particularly prevalent in Africa, where it has been a building tradition for centuries. Sites range from ancestral cities in Mali to the palaces of Abomey in Benin, from monuments and mosques in Iran and Buddhist temples on the Silk Road to Spanish missions in California. This volume's sixty-four papers address such themes as earthen architecture in Mali, the conservation of living sites, local knowledge systems and intangible aspects, seismic and other natural forces, the conservation and management of archaeological sites, research advances, and training.
Book Synopsis Radiative Transfer in the Atmosphere and Ocean by : Gary E. Thomas
Download or read book Radiative Transfer in the Atmosphere and Ocean written by Gary E. Thomas and published by Cambridge University Press. This book was released on 2002-01-28 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a foundation of the theoretical and practical aspects of radiative transfer, for the atmospheric, oceanic and environmental sciences.
Book Synopsis Philosophy manual: a South-South perspective by : Chanthalangsy, Phinith
Download or read book Philosophy manual: a South-South perspective written by Chanthalangsy, Phinith and published by UNESCO Publishing. This book was released on 2014-12-31 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Subsurface-water Flow and Solute Transport by :
Download or read book Subsurface-water Flow and Solute Transport written by and published by . This book was released on 1989 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis From First Light to Reionization by : Massimo S. Stiavelli
Download or read book From First Light to Reionization written by Massimo S. Stiavelli and published by John Wiley & Sons. This book was released on 2009-04-22 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: This up-to-date and concise account of a critical period of the early universe directly links the latest theories and experiments. Targeted at cosmological problems rather than specific methods, it begins with an introduction reviewing the early universe and looks at why reionization is important. The process of reionization analyzes simple analytical considerations and compares existing observations, while a further chapter describes some of the issues regarding the transition from Population III to Population II stars, as well as the constraints that can be derived from WMAP. Further chapters survey the latest numerical modeling and future perspectives for studying the dark ages using galaxies as probes. Written by a scientist with much experience in both research and writing, this account is equally suitable for young researchers as well as master and PhD students.
Book Synopsis Finite Volumes for Complex Applications IX - Methods, Theoretical Aspects, Examples by : Robert Klöfkorn
Download or read book Finite Volumes for Complex Applications IX - Methods, Theoretical Aspects, Examples written by Robert Klöfkorn and published by Springer Nature. This book was released on 2020-06-09 with total page 727 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proceedings of the 9th conference on "Finite Volumes for Complex Applications" (Bergen, June 2020) are structured in two volumes. The first volume collects the focused invited papers, as well as the reviewed contributions from internationally leading researchers in the field of analysis of finite volume and related methods. Topics covered include convergence and stability analysis, as well as investigations of these methods from the point of view of compatibility with physical principles. Altogether, a rather comprehensive overview is given on the state of the art in the field. The properties of the methods considered in the conference give them distinguished advantages for a number of applications. These include fluid dynamics, magnetohydrodynamics, structural analysis, nuclear physics, semiconductor theory, carbon capture utilization and storage, geothermal energy and further topics. The second volume covers reviewed contributions reporting successful applications of finite volume and related methods in these fields. The finite volume method in its various forms is a space discretization technique for partial differential equations based on the fundamental physical principle of conservation. Many finite volume methods preserve further qualitative or asymptotic properties, including maximum principles, dissipativity, monotone decay of free energy, and asymptotic stability, making the finite volume methods compatible discretization methods, which preserve qualitative properties of continuous problems at the discrete level. This structural approach to the discretization of partial differential equations becomes particularly important for multiphysics and multiscale applications. The book is a valuable resource for researchers, PhD and master’s level students in numerical analysis, scientific computing and related fields such as partial differential equations, as well as engineers working in numerical modeling and simulations.
Book Synopsis Interculturalism at the crossroads by : Mansouri, Fethi
Download or read book Interculturalism at the crossroads written by Mansouri, Fethi and published by UNESCO Publishing. This book was released on 2017-05-08 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Recursive Functions by : Rózsa Péter
Download or read book Recursive Functions written by Rózsa Péter and published by . This book was released on 1967 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Global Burden of Disease and Risk Factors by : Alan D. Lopez
Download or read book Global Burden of Disease and Risk Factors written by Alan D. Lopez and published by World Bank Publications. This book was released on 2006-04-02 with total page 511 pages. Available in PDF, EPUB and Kindle. Book excerpt: Strategic health planning, the cornerstone of initiatives designed to achieve health improvement goals around the world, requires an understanding of the comparative burden of diseases and injuries, their corresponding risk factors and the likely effects of invervention options. The Global Burden of Disease framework, originally published in 1990, has been widely adopted as the preferred method for health accounting and has become the standard to guide the setting of health research priorities. This publication sets out an updated assessment of the situation, with an analysis of trends observed since 1990 and a chapter on the sensitivity of GBD estimates to various sources of uncertainty in methods and data.
Book Synopsis Revisiting Moroccan Migrations by : Mohammed Berriane
Download or read book Revisiting Moroccan Migrations written by Mohammed Berriane and published by Routledge. This book was released on 2018-02-02 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the 20th century, Morocco has become one of the world’s major emigration countries. But since 2000, growing immigration and settlement of migrants from sub-Saharan Africa, the Middle East, and Europe confronts Morocco with an entirely new set of social, cultural, political and legal issues. This book explores how continued emigration and increasing immigration is transforming contemporary Moroccan society, with a particular emphasis on the way the Moroccan state is dealing with shifting migratory realities. The authors of this collective volume embark on a dialogue between theory and empirical research, showcasing how contemporary migration theories help understanding recent trends in Moroccan migration, and, vice-versa, how the specific Moroccan case enriches migration theory. This perspective helps to overcome the still predominant Western-centric research view that artificially divide the world into ‘receiving’ and ‘sending’ countries and largely disregards the dynamics of and experiences with migration in countries in the Global South. This book was previously published as a special issue of The Journal of North African Studies.
Book Synopsis Satellite Situation Report by : Goddard Space Flight Center. Office of Public Affairs
Download or read book Satellite Situation Report written by Goddard Space Flight Center. Office of Public Affairs and published by . This book was released on 1977 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pilgrimage and Holy Space in Late Antique Egypt by : David Frankfurter
Download or read book Pilgrimage and Holy Space in Late Antique Egypt written by David Frankfurter and published by BRILL. This book was released on 2015-08-27 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume deals with the origins and rise of Christian pilgrimage cults in late antique Egypt. Part One covers the major theoretical issues in the study of Coptic pilgrimage, such as sacred landscape and shrines' catchment areas, while Part Two examines native Egyptian and Egyptian Jewish pilgrimage practices. Part Three investigates six major shrines, from Philae's diverse non-Christian devotees to the great pilgrim center of Abu Mina and a Thecla shrine on its route. Part Four looks at such diverse pilgrims' rites as oracles, chant, and stational liturgy, while Part Five brings in Athanasius's and an anonymous hagiographer's perspectives on pilgrimage in Egypt. The volume includes illustrations of the Abu Mina site, pilgrims' ampules from the Thecla shrine, as well as several maps.
Book Synopsis Social Media in Industrial China by : Xinyuan Wang
Download or read book Social Media in Industrial China written by Xinyuan Wang and published by UCL Press. This book was released on 2016-09-13 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: Life outside the mobile phone is unbearable.’ Lily, 19, factory worker. Described as the biggest migration in human history, an estimated 250 million Chinese people have left their villages in recent decades to live and work in urban areas. Xinyuan Wang spent 15 months living among a community of these migrants in a small factory town in southeast China to track their use of social media. It was here she witnessed a second migration taking place: a movement from offline to online. As Wang argues, this is not simply a convenient analogy but represents the convergence of two phenomena as profound and consequential as each other, where the online world now provides a home for the migrant workers who feel otherwise ‘homeless’. Wang’s fascinating study explores the full range of preconceptions commonly held about Chinese people – their relationship with education, with family, with politics, with ‘home’ – and argues why, for this vast population, it is time to reassess what we think we know about contemporary China and the evolving role of social media.
Download or read book Civil Paths to Peace written by and published by Commonwealth Secretariat. This book was released on 2007 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report examines the issues of terrorism, extremism, conflict and violence, which are much in ascendancy and afflict Commonwealth countries as well as the rest of the world, and considers methods of countering disaffection and violence through civil means.
