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Etude Experimentale Des Instabilites De Couches Limites Sur Des Parois Concaves
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Book Synopsis ETUDE EXPERIMENTALE DES INSTABILITES DE COUCHES LIMITES SUR DES PAROIS CONCAVES by : Philippe Petitjeans
Download or read book ETUDE EXPERIMENTALE DES INSTABILITES DE COUCHES LIMITES SUR DES PAROIS CONCAVES written by Philippe Petitjeans and published by . This book was released on 1992 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: NOUS ETUDIONS L'INSTABILITE DE GORTLER DANS UN CANAL HYDRODYNAMIQUE BIEN CONTROLE PAR LES TECHNIQUES DE VISUALISATION PAR FLUORESCENCE INDUITE PAR LASER ET PAR UN SYSTEME AUTOMATISE DE VELOCIMETRIE LASER. NOUS MONTRONS LA DIFFERENCE ENTRE LE CHAMP DE VITESSE LONGITUDINALE OBTENU PAR VELOCIMETRIE LASER, ET LE CHAMP DE CONCENTRATION OBTENU PAR VISUALISATION QUI PRESENTE DES LIGNES BEAUCOUP PLUS FINES. NOUS EXPLIQUONS CECI PAR LA DIFFERENCE QUI EXISTE ENTRE LA DIFFUSION DE LA VORTICITE ET CELLE DE LA MASSE. ENSUITE, NOUS CARACTERISONS L'ECOULEMENT DE BASE BIDIMENSIONNEL NON PERTURBE PAR DES SIMULATIONS NUMERIQUES 2D, UN CALCUL ANALYTIQUE DE COUCHE LIMITE, ET DES MESURES EXPERIMENTALES. NOUS MONTRONS QUE DANS UNE CONDUITE COURBE, L'ECOULEMENT EST ACCELERE DU COTE DE LA PAROI CONVEXE ET RALENTI DU COTE DE LA PAROI CONCAVE; NOUS NOUS INTERESSONS AUSSI A L'INFLUENCE DU GRADIENT LONGITUDINAL DE PRESSION. NOUS DONNONS DE PLUS UN APERCU DES STRUCTURES TRIDIMENSIONNELLES QUI APPARAISSENT DANS UNE TELLE GEOMETRIE. PUIS, APRES UN CALCUL DE STABILITE LINEAIRE, NOUS PRESENTONS LES RESULTATS DE NOS EXPERIENCES SUR L'INSTABILITE DE GORTLER DANS LE CAS LAMINAIRE. NOUS MONTRONS L'EVOLUTION DES ROULEAUX LE LONG DE LA PAROI CONCAVE, ET NOUS TENTONS DE TROUVER UN MODELE QUI REPRESENTE CETTE EVOLUTION. ENFIN, NOUS PRESENTONS QUELQUES RESULTATS SUR L'INSTABILITE SECONDAIRE, SUR L'INFLUENCE DE JETS INJECTES A L'AMONT SUR LES ROULEAUX, ET SUR LES EFFETS D'UNE ROTATION SUR L'EVOLUTION DE L'INSTABILITE
Book Synopsis Étude numérique des instabilités d'un écoulement de couche limite en présence d'une paroi déformable by : Olivier Wiplier
Download or read book Étude numérique des instabilités d'un écoulement de couche limite en présence d'une paroi déformable written by Olivier Wiplier and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: En effet, mis à part l'onde de Tollmien-Schlichting, d'autres sources d'instabilités issues de l'interaction apparaissent. La résolution du système complet de Navier-Stokes couple au modèle dynamique de la paroi a permis ensuite de simuler simultanément ces sources d'instabilités et leurs interactions. La prise en compte de parois souples de longueurs finies a notamment permis de mettre en évidence des ondes progressives se propageant vers l'amont ou des déformées globales de la surface (induites par les non-linéarités). La recherche d'une instabilité absolue dans le système a été menée de manière systématique, à la fois par une étude linéaire de l'instabilité et par l'injection d'un signal impulsionnel dans le système global fluide-structure. Bien qu'il soit effectivement possible de réduire l'amplification de l'instabilité visqueuse par utilisation de parois souples, la paroi elle-même généré des ondes dont l'interaction avec celle du fluide peut conduire dans certains cas à une détérioration de la paroi par l'apparition possible d'un mécanisme d'instabilité absolue.
Book Synopsis AIAA Journal by : American Institute of Aeronautics and Astronautics
Download or read book AIAA Journal written by American Institute of Aeronautics and Astronautics and published by . This book was released on 1996 with total page 1422 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book La Recherche Aérospatiale written by and published by . This book was released on 1995 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Contribution à l'étude de couches limites sur parois rainurées by : Lyazid Djenidi
Download or read book Contribution à l'étude de couches limites sur parois rainurées written by Lyazid Djenidi and published by . This book was released on 1989 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt: CE TRAVAIL, A LA FOIS EXPERIMENTAL ET NUMERIQUE A POUR BUT DE METTRE EN EVIDENCE SI DES RAINURES LONGITUDINALES (RIBLETS) A LA PAROI PEUVENT REDUIRE LE FROTTEMENT PAR RAPPORT A UNE PAROI LISSE, EN COUCHE LIMITE LAMINAIRE, CECI AFIN D'APPORTER UNE EVENTUELLE EXPLICATION A LA REDUCTION DE TRAINEE OBSERVEE EN REGIME TURBULENT: LA REDUCTION DE TRAINEE SERAIT DUE A LA PRESENCE D'ECOULEMENT A FAIBLE VITESSE DANS LES CREUX DES RAINURES. DES MESURES, EN TUNNEL HYDRODYNAMIQUE, AU VELOCIMETRE LASER-DOPPLER SONT ENTREPRISES AINSI QUE DES VISUALISATIONS. ON MET AINSI EN EVIDENCE, EN REGIME LAMINAIRE, D'UNE PART, QUE LA DISTRIBUTION TRANSVERSALE DU FROTTEMENT EST COMPLETEMENT MODIFIEE AUGMENTATION DU FROTTEMENT AU NIVEAU DES CRETES, REDUCTION DANS LE CREUX MAIS QUE LE FROTTEMENT GLOBAL EST PRATIQUEMENT EGAL AU FROTTEMENT SUR PAROI LISSE, MALGRE L'AUGMENTATION DE LA SURFACE MOUILLEE, ET D'AUTRE PART, L'ABSENCE DE TOURBILLONS CONTRAROTATIFS LONGITUDINAUX SECONDAIRES DANS LES CREUX. DES SIMULATIONS NUMERIQUES SONT EZGALEMENT EFFECTUEES. ON CONSIDERE LES EQUATIONS SOUS LEUR FORME PARABOLIQUE ET DANS LE CAS BIDIMENSIONNEL. LA CONFRONTATION CALCUL/EXPERIENCE EST TRES SATISFAISANTE ET L'ETUDE PARAMETRIQUE ENTREPRISE MONTRE QU'IL EXISTERAIT DES RAINURES DE SECTION TRIANGULAIRE QUI REDUIRAIENT LE FROTTEMENT EN COUCHE LIMITE LAMINAIRE, AVEC UN MAXIMUM DE REDUCTION DE 2,5% POUR UN RAPPORT DE L'ORDRE DE UN ENTRE LA DISTANCE CRETE A CRETE ET LA PROFONDEUR DES RAINURES
Book Synopsis Étude expérimentale des couches limites turbulentes et transitionnelles en écoulement pulsé by : André Desopper
Download or read book Étude expérimentale des couches limites turbulentes et transitionnelles en écoulement pulsé written by André Desopper and published by . This book was released on 1977 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: Étude du développement d'une couche limite turbulente de plaque en presence d'un écoulement extérieur pulsé, incompressible et bidimensionnel : étude de l'influence de la non-stationnarite sur la structure de la couche limite et développement de méthodes de calcul. Étude de la transition d'une couche limite de plaque plane en écoulement pulsé.
Book Synopsis ETUDE D'UNE COUCHE LIMITE INSTATIONNAIRE SUR UNE PAROI DEFORMABLE by : Arnault Monavon
Download or read book ETUDE D'UNE COUCHE LIMITE INSTATIONNAIRE SUR UNE PAROI DEFORMABLE written by Arnault Monavon and published by . This book was released on 1986 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: ETUDE THEORIQUE, NUMERIQUE ET EXPERIMENTALE DES CHAMPS DE PRESSION ET DE VITESSE AU VOISINAGE D'UNE PLAQUE MINCE,DEFORMABLE, PLACEE DANS UN ECOULEMENT D'EAU UNIFORME, A GRANDS NOMBRES DE REYNOLDS
Download or read book Paper written by and published by . This book was released on 1992 with total page 852 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Lake Pavin by : Télesphore Sime-Ngando
Download or read book Lake Pavin written by Télesphore Sime-Ngando and published by Springer. This book was released on 2016-10-31 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book represents the first multidisciplinary scientific work on a deep volcanic maar lake in comparison with other similar temperate lakes. The syntheses of the main characteristics of Lake Pavin are, for the first time, set in a firmer footing comparative approach, encompassing regional, national, European and international aquatic science contexts. It is a unique lake because of its permanently anoxic monimolimnion, and furthermore, because of its small surface area, its substantially low human influence, and by the fact that it does not have a river inflow. The book reflects the scientific research done on the general limnology, history, origin, volcanology and geological environment as well as on the geochemistry and biogeochemical cycles. Other chapters focus on the biology and microbial ecology whereas the sedimentology and paleolimnology are also given attention. This volume will be of special interest to researchers and advanced students, primarily in the fields of limnology, biogeochemistry, and aquatic ecology.
Book Synopsis Ordered and Turbulent Patterns in Taylor-Couette Flow by : C. David Andereck
Download or read book Ordered and Turbulent Patterns in Taylor-Couette Flow written by C. David Andereck and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 351 pages. Available in PDF, EPUB and Kindle. Book excerpt: Seldom does a physical system, particularly one as apparently simple as the flow of a Newtonian fluid between concentric rotating cylinders, retain the interest of scientists, applied mathematicians and engineers for very long. Yet, as this volume goes to press it has been nearly 70 years since G. I. Taylor's outstanding experimental and theoretical study of the linear stability of this flow was published, and a century since the first experiments were performed on rotating cylinder viscometers. Since then, the study of this system has progressed enormously, but new features of the flow patterns are still being uncovered. Interesting variations on the basic system abound. Connections with open flows are being made. More complex fluids are used in some experiments. The vigor of the research going on in this particular example of nonequilibrium systems was very apparent at the NATO Advanced Research Workshop on "Ordered and Turbulent Patterns in Taylor Couette Flow," held in Columbus, Ohio, USA May 22-24, 1991. A primary goal of this ARW was to bring together those interested in pattern formation in the classic Taylor Couette problem with those looking at variations on the basic system and with those interested in related systems, in order to better define the interesting areas for the future, the open questions, and the features common (and not common) to closed and open systems. This volume contains many of the contributions presented during the workshop.
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1988 with total page 1424 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1988 with total page 1102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1973 with total page 1108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Parallel Finite Volume Algorithm for Large-eddy Simulation of Turbulent Flows by : Trong T. Bui
Download or read book A Parallel Finite Volume Algorithm for Large-eddy Simulation of Turbulent Flows written by Trong T. Bui and published by . This book was released on 1998 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aircraft Excrescence Drag by : Alec David Young
Download or read book Aircraft Excrescence Drag written by Alec David Young and published by . This book was released on 1981 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development Publisher : ISBN 13 : Total Pages :472 pages Book Rating :4.3/5 (243 download)
Book Synopsis AGARD Advisory Report by : North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development
Download or read book AGARD Advisory Report written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development and published by . This book was released on 1988 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Turbulence written by Uriel Frisch and published by Cambridge University Press. This book was released on 1995-11-30 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook presents a modern account of turbulence, one of the greatest challenges in physics. The state-of-the-art is put into historical perspective five centuries after the first studies of Leonardo and half a century after the first attempt by A. N. Kolmogorov to predict the properties of flow at very high Reynolds numbers. Such 'fully developed turbulence' is ubiquitous in both cosmical and natural environments, in engineering applications and in everyday life. The intended readership for the book ranges from first-year graduate students in mathematics, physics, astrophysics, geosciences and engineering, to professional scientists and engineers. Elementary presentations of dynamical systems ideas, of probabilistic methods (including the theory of large deviations) and of fractal geometry make this a self-contained textbook.
