Author: Régis DumasPublisher:
ISBN:
Category : Spectrum analysis
Languages : fr
Pages : 156
Book Description
Contribution a l'étude des spectres de turbulence
Author: Régis DumasPublisher:
ISBN:
Category : Spectrum analysis
Languages : fr
Pages : 156
Book Description
Contribution à l'étude des spectres de turbulence
Author: Régis DumasPublisher:
ISBN:
Category : Spectrum analysis
Languages : fr
Pages : 138
Book Description
Turbulence in Fluids
Author: Marcel LesieurPublisher: Springer Science & Business Media
ISBN: 9401090181
Category : Science
Languages : en
Pages : 520
Book Description
Turbulence is a dangerous topic which is often at the origin of serious fights in the scientific meetings devoted to it since it represents extremely different points of view, all of which have in common their complexity, as well as an inability to solve the problem. It is even difficult to agree on what exactly is the problem to be solved. Extremely schematically, two opposing points of view have been ad vocated during these last twenty years: the first one is "statistical", and tries to model the evolution of averaged quantities of the flow. This com munity, which has followed the glorious trail of Taylor and Kolmogorov, believes in the phenomenology of cascades, and strongly disputes the possibility of any coherence or order associated to turbulence. On the other bank of the river stands the "coherence among chaos" community, which considers turbulence from a purely deterministic po int of view, by studying either the behaviour of dynamical systems, or the stability of flows in various situations. To this community are also associated the experimentalists who seek to identify coherent structures in shear flows.
Contribution à l'étude de la diffusion par turbulence
Author: Jean MalengéScientific and Technical Aerospace Reports
Author: Contribution à l'étude numérique et théorique de la turbulence bidimensionnelle
Author: Claude BasdevantPublisher:
ISBN:
Category :
Languages : fr
Pages : 189
Book Description
Objectif du travail : résoudre les problèmes de modélisation pour un écoulement bidimensionnel de type météorologique, en se restreignant aux grandes échelles. La modélisation des effets des petites échelles est conduite par la méthode lagrangienne et la troncature est choisie dans la zone inertielle d'entrophie. La simulation de l'écoulement est celle a long terme. On insiste tout au long de la modélisation des structures fines, sur le caractère de démarche de concert entre le théoricien et le numericien. Une partie de l'étude est consacrée à la dépendance temporelle du spectre d'énergie. On termine par une étude, dans le cadre phénoménologique et statistique, de la turbulence 2-d au moyen de la simulation numérique directe en s'intéressant plus spécialement aux états de régime et a la predicibilite. Dans le régime de décroissance, ou les choses sont complexes, on expose les résultats concernant la phase de décroissance autosimilaire du spectre d'énergie; quelques éléments sont apportes sur la phase initiale d'évolution et on vérifie ces conjectures par des intégrations numériques de l'équation edqnm.
Modeling and Simulation of Turbulent Flows
Author: Roland SchiestelPublisher: John Wiley & Sons
ISBN: 0470393467
Category : Science
Languages : en
Pages : 751
Book Description
This title provides the fundamental bases for developing turbulence models on rational grounds. The main different methods of approach are considered, ranging from statistical modelling at various degrees of complexity to numerical simulations of turbulence. Each of these various methods has its own specific performances and limitations, which appear to be complementary rather than competitive. After a discussion of the basic concepts, mathematical tools and methods for closure, the book considers second order closure models. Emphasis is placed upon this approach because it embodies potentials for clarifying numerous problems in turbulent shear flows. Simpler, generally older models are then presented as simplified versions of the more general second order models. The influence of extra physical parameters is also considered. Finally, the book concludes by examining large Eddy numerical simulations methods. Given the book’s comprehensive coverage, those involved in the theoretical or practical study of turbulence problems in fluids will find this a useful and informative read.
Turbulent Flow
Author: Galen Brandt SchubauerPublisher: Princeton University Press
ISBN: 1400879582
Category : Science
Languages : en
Pages : 131
Book Description
Part of the Princeton Aeronautical Paperback series designed to bring to students and research engineers outstanding portions of the twelve-volume High Speed Aerodynamics and Jet Propulsion series. These books have been prepared by direct reproduction of the text from the original series and no attempt has been made to provide introductory material or to eliminate cross reference to other portions of the original volumes. Originally published in 1945. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.
Contribution à l'étude de la turbulence de conduite
Author: Geneviève Comte-BellotPublisher:
ISBN:
Category :
Languages : fr
Pages : 103
Book Description
Author: Nguyen Ky Toan