Download or read book Mod lisation num rique de mod les thermom caniques polyphasiques written by Layal Lizaik and published by . This book was released on 2008 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dans ce travail, on étudie d’un point de vue thermomécanique deux modèles d’écoulements afin d’interpréter des mesures de température dans le puits. On couple d’abord un modèle réservoir axisymétrique incluant les effets de dissipation visqueuse et de compressibilité avec un modèle puits pseudo 1D pour l’écoulement d’un fluide monophasique. Des conditions de transmission adéquates sont imposées à l’interface entre les deux domaines et ensuite dualisées par des multiplicateurs de Lagrange. On obtient ainsi une formulation variationnelle mixte non standard pour le problème couplé. Les flux sont discrétisés par des éléments finis de Raviart-Thomas. Enfin, on montre que les problèmes couplés continu et discret sont bien posés. On développe ensuite un modèle réservoir multi-phasique (huile, gaz et eau) et multicomposant. Compte tenu de la complexité du problème, on a choisi d’étendre un simulateur non-thermique existant en lui ajoutant une équation d’énergie adéquate et la thermodynamique correspondante. La discrétisation en espace est faite à l’aide des volumes finis et le système non-linéaire obtenu est résolu par la méthode de Newton-Raphson. Des tests numériques validant les codes développés sont présentés.

Download or read book Simulation num rique et couplage de mod les thermom caniques puits milieux poreux written by Bertrand Denel and published by . This book was released on 2004 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt: Afin d'interpréter les variations de température que l'on sait désormais mesurer de manière permanente dans les puits de pétrole, et ainsi de mieux caractériser les réservoirs, on développe une approche directe qui modélise finement le comportement dynamique et thermique des fluides en écoulement, tant dans le puits que dans le réservoir. On propose pour cela de coupler un modèle réservoir, notamment caractérisé par une équation de conservation de l'énergie non standard incluant les effets de dissipation visqueuse et de compressibilité, avec un nouveau modèle de puits pseudo 1D. L'originalité de ce dernier modèle consiste à dériver une approximation conforme d'un modèle 2D et ainsi à prendre en compte la direction privilégiée de l'écoulement et la géométrie particulière du puits, en explicitant la dépendance des inconnues dans la direction radiale. Pour chacun des modèles, la discrétisation des flux met en œuvre les éléments finis conservatifs de Raviart-Thomas, ce qui nous assure des conditions de raccord naturelles à l'interface. Une analyse des formulations mixtes alors obtenues montre que les problèmes semi-discrétisés sont bien posés, puis des résultats numériques sont présentés sur des cas d'étude réels. Enfin, une approche globale du couplage de nos deux modèles est exposée.

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.

Download or read book Instabilities in Multiphase Flows written by A. Berlemont and published by . This book was released on 2014-01-15 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Parallel Computing written by Barbara Chapman and published by IOS Press. This book was released on 2010 with total page 760 pages. Available in PDF, EPUB and Kindle. Book excerpt: From Multicores and GPUs to Petascale. Parallel computing technologies have brought dramatic changes to mainstream computing the majority of todays PCs, laptops and even notebooks incorporate multiprocessor chips with up to four processors. Standard components are increasingly combined with GPUs Graphics Processing Unit, originally designed for high-speed graphics processing, and FPGAs Free Programmable Gate Array to build parallel computers with a wide spectrum of high-speed processing functions. The scale of this powerful hardware is limited only by factors such as energy consumption and thermal control. However, in addition to"

Download or read book Modelling Fluid Flow written by János Vad and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modelling Fluid Flow presents invited lectures, workshop summaries and a selection of papers from a recent international conference CMFF '03 on fluid technology. The lectures follow the current evolution and the newest challenges of the computational methods and measuring techniques related to fluid flow. The workshop summaries reflect the recent trends, open questions and unsolved problems in the mutually inspiring fields of experimental and computational fluid mechanics. The papers cover a wide range of fluids engineering, including reactive flow, chemical and process engineering, environmental fluid dynamics, turbulence modelling, numerical methods, and fluid machinery.

Download or read book Parallel Computational Fluid Dynamics written by Kenli Li and published by Springer. This book was released on 2014-03-08 with total page 626 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the 25th International Conference on Parallel Computational Fluid Dynamics, ParCFD 2013, held in Changsha, China, in May 2013. The 35 revised full papers presented were carefully reviewed and selected from more than 240 submissions. The papers address issues such as parallel algorithms, developments in software tools and environments, unstructured adaptive mesh applications, industrial applications, atmospheric and oceanic global simulation, interdisciplinary applications and evaluation of computer architectures and software environments.