STRUCTURES SPATIALES ET TURBULENCE DE PHASE EN CONVECTION DE RAYLEIGH-BENARD PDF Download
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Author: Alain Pocheau
Publisher:
ISBN:
Category :
Languages : fr
Pages : 136
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Book Description
ON ANALYSE LA TRANSITION SUR DEUX DECADES DE NOMBRE DE PRANDTL, DU REGIME DE SELECTION DE NOMBRE DE D'ONDE A CELUI DE TURBULENCE DE PHASE. ON DETERMINE LE ROLE DES DEFAUTS DE STRUCTURE. ON IDENTIFIE LA PRESENCE D'ECOULEMENTS DE DERIVE DONT ON DEMONTRE L'IMPORTANCE ENVERS LA FORMATION DES CONTRAINTES. CET EFFET EST ANALYSE PAR UN FORMALISME D'INVARIANCE DE JAUGE. PAR VISUALISATION DE LA CONVECTION EN PHASE GAZEUSE ON CARACTERISE LES MECANISMES DE LA TURBULENCE DE PHASE
Author: Alain Pocheau
Publisher:
ISBN:
Category :
Languages : fr
Pages : 136
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Book Description
ON ANALYSE LA TRANSITION SUR DEUX DECADES DE NOMBRE DE PRANDTL, DU REGIME DE SELECTION DE NOMBRE DE D'ONDE A CELUI DE TURBULENCE DE PHASE. ON DETERMINE LE ROLE DES DEFAUTS DE STRUCTURE. ON IDENTIFIE LA PRESENCE D'ECOULEMENTS DE DERIVE DONT ON DEMONTRE L'IMPORTANCE ENVERS LA FORMATION DES CONTRAINTES. CET EFFET EST ANALYSE PAR UN FORMALISME D'INVARIANCE DE JAUGE. PAR VISUALISATION DE LA CONVECTION EN PHASE GAZEUSE ON CARACTERISE LES MECANISMES DE LA TURBULENCE DE PHASE
Author: Alexander V Getling
Publisher: World Scientific
ISBN: 9814498971
Category : Science
Languages : en
Pages : 256
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Book Description
This invaluable book presents a concise but systematic account of the formation of spatial flow structures in a horizontal fluid layer heated from below. Flows of this type, known as Rayleigh-Bénard convection, show important features of behaviour inherent not only in various hydrodynamic-instability phenomena but also in nonlinear pattern-forming processes in other contexts. The book describes the basic methods of investigating convection patterns, and the types of two- and three-dimensional flows, pattern defects, and sequences of convection-regime changes.The author pays special attention to the question of how various factors (mainly reducible to initial and boundary conditions) determine the shapes and sizes of the structures which develop. In this way, the role of order and disorder in flow patterns, as a factor strongly affecting the character of the evolution of structures, is revealed. The presentation emphasizes the physical picture of these phenomena, without excessive mathematical detail.
Author: F.H. Busse
Publisher: Springer Science & Business Media
ISBN: 1468457934
Category : Science
Languages : en
Pages : 552
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Book Description
This volume contains papers contributed to the NATO Advanced Research Workshop "Nonlinear Evolution of Spatio-Temporal Structures in Dissipative Continuous Systems" held in Streitberg, Fed. Rep. Germany, Sept. 24 through 30, 1989. The purpose of the rather long title has been to focus attention on a particularly fruitful direction of research within the broad field covered by terms like Nonlinear Dynamics or Non-Equilibrium Systems. After physicists have been occupied for several decades mainly with the microscopic structure of matter, recent years have witnessed a resurgence of interest in macroscopic patterns and dynamics. Research on these latter phenomena has not been dormant, of course, since fluid dynamicists interested in the origin of turbulence, meteorologists studying weather patterns and numerous other scientists have continued to advance the understanding of the structures relevant to their disciplines. The recent progress in the dynamics of nonl inear systems wi th few degrees of freedom and the discovery of universal laws such as the Feigenbaum scaling of period-doubling cascades has given rise to new hopes for the understanding of common principles underlying the spontaneous formation of structures in extended continuous systems.
Author: Pierre Coullet
Publisher: Springer Science & Business Media
ISBN: 1468474790
Category : Technology & Engineering
Languages : en
Pages : 341
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Book Description
The basic aim of the NATO Advanced Research Workshop on "New Trends in Nonlinear Dynamics and Pattern-Forming Phenomena: The Geometry of Nonequilibrium" was to bring together researchers from various areas of physics to review and explore new ideas regarding the organisation of systems driven far from equilibrium. Such systems are characterized by a close relationship between broken spatial and tempo ral symmetries. The main topics of interest included pattern formation in chemical systems, materials and convection, traveling waves in binary fluids and liquid crystals, defects and their role in the disorganisa tion of structures, spatio-temporal intermittency, instabilities and large-scale vortices in open flows, the mathematics of non-equilibrium systems, turbulence, and last but not least growth phenomena. Written contributions from participants have been grouped into chapters addressing these different areas. For additional clarity, the first chapter on pattern formation has been subdivided into sections. One of the main concerns was to focus on the unifying features between these diverse topics. The various scientific communities repre sented were encouraged to discuss and compare their approach so as to mutually benefit their respective fields. We hope that, to a large degree, these goals have been met and we thank all the participants for their efforts. The workshop was held in Cargese (Corsica, France) at the Institut d'Etudes Scientifiques from August 2nd to August 12th, 1988. We greatly thank Yves Pomeau and Daniel Walgraef who, as members of the organising committee, gave us valuable advice and encouragements.
Author:
Publisher:
ISBN: 9789036539104
Category :
Languages : en
Pages : 187
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Book Description
Author: Innocent Mutabazi
Publisher: Springer Science & Business Media
ISBN: 0387400982
Category : Science
Languages : en
Pages : 249
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Book Description
The impact of Benard's discovery on 20th century physics is crucial to any modern research area such as fluid dynamics, nonlinear dynamics, and non-equilibrium thermodynamics, just to name a few. This centenary review shows the broad scope and development including modern applications, edited and written by experts in the field.
Author: James Douglas Hogg
Publisher:
ISBN: 9781267767547
Category :
Languages : en
Pages : 256
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Book Description
Spatial power spectra of the shadowgraph images showed peaks at small wavelengths which decreased with increasing Rayleigh number. Only at the highest observed Rayleigh numbers were large-scale structures comparable in size to the height of the cell observed.
Author: FRANCOIS.. DAVIAUD
Publisher:
ISBN:
Category :
Languages : fr
Pages :
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Book Description
NOUS ETUDIONS LES PROPRIETES SPATIO-TEMPORELLES ET LA TRANSITION A LA TURBULENCE DANS DES SYSTEMES D'ECOULEMENTS CONVECTIFS DE RAYLEIGH-BENARD POSSEDANT UNE OU DEUX DIMENSIONS D'ESPACE. LA PREMIERE PARTIE EST CONSACREE A L'ETUDE DE SYSTEMES CONVECTIFS UNIDIMENSIONNELS. ELLE REVELE L'EXISTENCE DE COMPORTEMENTS DYNAMIQUES COLLECTIFS, PUIS UNE TRANSITION VERS LA TURBULENCE VIA UN PHENOMENE D'INTERMITTENCE SPATIO-TEMPOREL CARACTERISE PAR LA COEXISTENCE DE REGIONS ORDONNEES (LAMINAIRES) ET DESORDONNEES (TURBULENTES), QUI EVOLUENT DANS LE TEMPS ET DANS L'ESPACE. NOUS MONTRONS PAR UNE ETUDE STATISTIQUE QUE CETTE EVOLUTION PEUT ETRE DECRITE EN TERMES DE TRANSITION DE PHASE ET QU'ELLE EST SIMILAIRE A LA TRANSITION OBSERVEE DANS CERTAINS MODELES NUMERIQUES, NOTAMMENT EN PERCOLATION DIRIGEE. LA SECONDE PARTIE CONCERNE L'ETUDE DES ROUTES VERS LA TURBULENCE QUI SONT OBSERVEES DANS DES GEOMETRIES ETENDUES ET A FAIBLE NOMBRE DE PRANDTL. LES RESULTATS EXPERIMENTAUX SONT PRESENTES PUIS INTERPRETES DANS LE CADRE D'UN FORMALISME UTILISANT LES EQUATIONS DE PHASE. ILS MONTRENT L'INTERACTION EXISTANT ENTRE LES COURANTS A GRANDE ECHELLE ET LES ECOULEMENTS CONVECTIFS, ET METTENT EN EVIDENCE L'INFLUENCE DES CONDITIONS AUX LIMITES SUR L'EVOLUTION DES STRUCTURES CONVECTIVES
Author: P. Tabeling
Publisher: Springer Science & Business Media
ISBN: 1461525861
Category : Science
Languages : en
Pages : 155
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Book Description
The present volume comprises the contributions of some of the participants of the NATO Advance Studies Institute "Turbulence, Weak and Strong", held in Cargese, in August 1994. More than 70 scientists, from seniors to young students, have joined to gether to discuss and review new (and not so new) ideas and developments in the study of turbulence. One of the objectives of the School was to incorporate, in the same meeting, two aspects of turbulence, which are obviously linked, and which are often treated sep arately: fully developed turbulence (in two and three dimensions) and weak turbulence (essentially one and two-dimensional systems). The idea of preparing a dictionary rather than ordinary proceedings started from the feeling that the terminology of turbulence includes many long, technical, poorly evocative words, which are usually not understood by people exterior to the field, and which might be worth explaining. Students who start working in the field of turbulence face a sort of curious situation: on one side, they are aware that turbulence is related to the disordered, churning flows of torrents, the pow erful movements of water in the oceans, the violent jet streams in the troposphere, the solar eruptions, and they are certainly excited to pierce the mystery of this fascinating, omnipresent phenomenon.
Author: Innocent Mutabazi
Publisher: Springer
ISBN: 0387251111
Category : Science
Languages : en
Pages : 249
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Book Description
The impact of Benard's discovery on 20th century physics is crucial to any modern research area such as fluid dynamics, nonlinear dynamics, and non-equilibrium thermodynamics, just to name a few. This centenary review shows the broad scope and development including modern applications, edited and written by experts in the field.
