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Etude Experimentale De Leclatement Du Tourbillon Dune Aile Delta En Ecoulement Incompressible
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Book Synopsis Étude experimentale de l'eclatement du tourbillon d'une aile delta en ecoulement incompressible by : Didien Pagan
Download or read book Étude experimentale de l'eclatement du tourbillon d'une aile delta en ecoulement incompressible written by Didien Pagan and published by . This book was released on 1985 with total page 4 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 1993 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Turbulence and Coherent Structures by : O. Métais
Download or read book Turbulence and Coherent Structures written by O. Métais and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last 25 years, one of the most striking advances in Fluid Mecha nics was certainly the discovery of coherent structures in turbulence: lab oratory experiments and numerical simulations have shown that most turbulent flows exhibit both spatially-organized large-scale structures and disorganized motions, generally at smaller scales. The develop ment of new measurement and visualization techniques have allowed a more precise characterization and investigation of these structures in the laboratory. Thanks to the unprecedented increase of computer power and to the development of efficient interactive three-dimensional colour graphics, computational fluid dynamicists can explore the still myste rious world of turbulence. However, many problems remain unsolved concerning the origin of these structures, their dynamics, and their in teraction with the disorganized motions. In this book will be found the latest results of experimentalists, theoreticians and numerical modellers interested in these topics. These coherent structures may appear on airplane wings or slender bodies, mixing layers, jets, wakes or boundary-layers. In free-shear flows and in boundary layers, the results presented here highlight the intense three-dimensional character of the vortices. The two-dimensional large scale eddies are very sensitive to three-dimensional perturbations, whose amplification leads to the formation of three-dimensional coherent vorti cal structures, such as streamwise, hairpin or horseshoe vortex filaments. This book focuses on modern aspects of turbulence study. Relations between turbulence theory and optimal control theory in mathematics are discussed. This may have important applications with regard to, e. g. , numerical weather forecasting.
Download or read book The Aeronautical Journal written by and published by . This book was released on 1986 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Contribution à l'étude du contrôle actif de l'éclatement tourbillonnaire sur aile en flèche en écoulement incompressible by : Rémi Laval-Jeantet
Download or read book Contribution à l'étude du contrôle actif de l'éclatement tourbillonnaire sur aile en flèche en écoulement incompressible written by Rémi Laval-Jeantet and published by . This book was released on 1993 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: LA DESORGANISATION BRUTALE DES STRUCTURES TOURBILLONNAIRES APPELEE ECLATEMENT A FAIT L'OBJET D'UNE ETUDE DE CONTROLE ACTIF. LE RETARDEMENT DE SON APPARITION GRACE A L'INJECTION DE QUANTITE DE MOUVEMENT PAR SOUFFLAGE DANS L'AXE DU TOURBILLON A ETE CONFIRME EXPERIMENTALEMENT SUR AILE DELTA A FORTE INCIDENCE EN ECOULEMENT INCOMPRESSIBLE. DES VALEURS QUALITATIVES DE NIVEAUX DE SOUFFLAGE OBTENUES PAR L'EXPERIENCE SE RETROUVENT PAR UNE SIMULATION NUMERIQUE TRIDIMENSIONNELLE SUR AILE EN FLECHE D'AVION DE COMBAT MODERNE. L'ETUDE CONTRADICTOIRE DES RESULTATS D'ESSAI A LA LUMIERE DES CRITERES DE STABILITE ETABLIS PAR LES THEORIES DE L'ECLATEMENT MENE A L'ELABORATION D'UN MODELE THEORIQUE BASE SUR UN PROCESSUS DE FOCALISATION D'ONDES D'INERTIE TRANSVERSES, SEMBLABLE DANS SON PRINCIPE A CELUI DE LA FORMATION DES ONDES DE CHOC SONIQUES
Book Synopsis 30th AIAA Fluid Dynamics Conference by :
Download or read book 30th AIAA Fluid Dynamics Conference written by and published by . This book was released on 1999 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA SP. written by and published by . This book was released on 1986 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis CONTRIBUTION A L'ETUDE EXPERIMENTALE ET THEORIQUE DE L'ECLATEMENT TOURBILLONNAIRE EN AIR INCOMPRESSIBLE by : DIDIER.. PAGAN
Download or read book CONTRIBUTION A L'ETUDE EXPERIMENTALE ET THEORIQUE DE L'ECLATEMENT TOURBILLONNAIRE EN AIR INCOMPRESSIBLE written by DIDIER.. PAGAN and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: EN AERODYNAMIQUE, LE PHENOMENE D'ECLATEMENT AFFECTE PRINCIPALEMENT LES TOURBILLONS SE FORMANT A L'EXTRADOS DES AILES EN FLECHE OU SUR LES FUSELAGES, LORS DU VOL A GRADE INCIDENCE. IL EST CARACTERISE PAR LA PRESENCE D'UN POINT D'ARRET SUR L'AXE DU TOURBILLON, SUIVI D'UNE ZONE DE RECIRCULATION, ET PLUS EN AVAL, D'UN ECOULEMENT TRES TURBULENT. UNE ETUDE EXPERIMENTALE, EN SOUFFLERIE, DES CONDITIONS D'APPARITION DE L'ECLATEMENT, ET UNE DESCRIPTION DETAILLEE DE CERTAINES CONFIGURATIONS ONT ETE REALISEES. DEUX MONTAGES ONT ETE UTILISES AFIN DE FAIRE VARIER LA FORME DES PROFILS DE VITESSE AMONT. L'ECLATEMENT EST PROVOQUE PAR UN GRADIENT DE PRESSION ADVERSE AJUSTABLE. LES MESURES DE VITESSE ET DE TURBULENCE ONT ETE REALISEES GRACE A LA VELOCIMETRIE LASER TRIDIRECTIONNELLE. LA COURBE LIMITE D'ECLATEMENT (TAUX DE ROTATION EN FONCTION DU TAUX DE RECOMPRESSION) A ETE DETERMINEE POUR DES FORMES DE PROFILS DE VITESSE AMONT VARIEES. LES CONFIGURATIONS FINEMENT DECRITES PEUVENT SERVIR DE REFERENCE EXPERIMENTALE POUR LA VALIDATION DES CODES DE CALCUL. SUR LE PLAN THEORIQUE, UN MODELE NUMERIQUE REPOSANT SUR LES EQUATIONS DE NAVIER-STOKES POUR UN ECOULEMENT LAMINAIRE, INCOMPRESSIBLE ET AXISYMETRIQUE A ETE DEVELOPPE. DES SOLUTIONS ECLATEES STATIONNAIRES DU TYPE BULBE SONT OBTENUES. UNE UTILISATION SYSTEMATIQUE DE CE CODE A PERMIS DE DETERMINER LA LIMITE D'ECLATEMENT, SOUS LA FORME D'UNE RELATION ENTRE LES DIFFERENTS PARAMETRES D'INFLUENCE. CETTE COURBE LIMITE D'ECLATEMENT EST EN BON ACCORD AVEC CELLE DETEMINEE EXPERIMENTALEMENT
Download or read book Aeronautical Engineering written by and published by . This book was released on 1986 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt: A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA)
Book Synopsis Contribution à l'étude d'un écoulement tourbillonnaire en fluide incompressible by : Philippe Pascal (auteur d'une thèse de physique en 1992).)
Download or read book Contribution à l'étude d'un écoulement tourbillonnaire en fluide incompressible written by Philippe Pascal (auteur d'une thèse de physique en 1992).) and published by . This book was released on 1992 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les tourbillons peuvent avoir des répercussions importantes sur les conditions de vol à grande incidence et des engins munis d'ailes à forte flèche. Une étude théorique a été effectuée afin de mettre au point une méthode de calcul susceptible de décrire un tourbillon. A cet effet, des comparaisons ont été faites entre différentes méthodes de prédétermination de l'évolution d'un tourbillon dans son processus d'éclatement. Ces méthodes sont fondées sur l'hypothèse d'axisymètrie, et sur un traitement statistique classique de la turbulence avec fermeture en un point. Une confrontation du calcul avec l'expérience permet de vérifier le réalisme de la théorie et de valider les modèles de turbulence. D'autre part, une étude expérimentale, en soufflerie, a été réalisée afin de quantifier l'influence de la turbulence sur le développement d'un tourbillon non éclaté, en utilisant un dispositif produisant un tourbillon de bout d'aile. La structure interne du tourbillon présente, au centre, une survitesse qui diminue selon la direction longitudinale. Le champ de vitesse extérieur est bien représenté par un tourbillon potentiel. La présence de mouvements latéraux d'ensemble de l'écoulement induit des fluctuations à basses fréquences, qui se superposent à la turbulence proprement dite
Download or read book Report written by and published by . This book was released on 1961 with total page 992 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book CANCAM Proceedings written by and published by . This book was released on 1985 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Vortex Flows and Related Numerical Methods by : J.T. Beale
Download or read book Vortex Flows and Related Numerical Methods written by J.T. Beale and published by Springer Science & Business Media. This book was released on 2013-04-18 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many important phenomena in fluid motion are evident in vortex flow, i.e., flows in which vortical structures are significant in determining the whole flow. This book, which consists of lectures given at a NATO ARW held in Grenoble (France) in June 1992, provides an up-to-date account of current research in the study of these phenomena by means of numerical methods and mathematical modelling. Such methods include Eulerian methods (finite difference, spectral and wavelet methods) as well as Lagrangian methods (contour dynamics, vortex methods) and are used to study such topics as 2- or 3-dimensional turbulence, vorticity generation by solid bodies, shear layers and vortex sheets, and vortex reconnection. For researchers and graduate students in computational fluid dynamics, numerical analysis, and applied mathematics.
Book Synopsis SIMULATION NUMERIQUE DE L'ECLATEMENT TOURBILLONNAIRE PAR RESOLUTION DES EQUATIONS TRIDIMENSIONNELLES DE NAVIER-STOKES EN FLUIDE INCOMPRESSIBLE by : PHILIPPE.. MEGE
Download or read book SIMULATION NUMERIQUE DE L'ECLATEMENT TOURBILLONNAIRE PAR RESOLUTION DES EQUATIONS TRIDIMENSIONNELLES DE NAVIER-STOKES EN FLUIDE INCOMPRESSIBLE written by PHILIPPE.. MEGE and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: UNE METHODE DE CALCUL D'ECOULEMENT INSTATIONNAIRE, TRIDIMENSIONNEL, DE FLUIDE INCOMPRESSIBLE, VISQUEUX OU NON, A ETE MISE EN UVRE DANS LE CADRE DES ETUDES CONCERNANT LE PHENOMENE DE L'ECLATEMENT TOURBILLONNAIRE. BASEE SUR LA RESOLUTION DES EQUATIONS DE NAVIER-STOKES EN FORMULATION VITESSE-PRESSION, ET DISCRETISEE A L'AIDE DE SCHEMAS AUX DIFFERENCES FINIES D'ORDRE 2 OU 4 EN ESPACE ET D'ORDRE 2 EN TEMPS, L'APPLICATION TRAITEE EST RELATIVE A UN TOURBILLON ISOLE, DONT LE PROFIL INITIAL DE VITESSE EST REPRESENTATIF DES TOURBILLONS D'AILE DELTA. CE TOURBILLON EST SOUMIS, SOIT A UNE PERTURBATION TRIDIMENSIONNELLE INITIALE IMPOSEE AU CUR MEME DU TOURBILLON, SOIT A UN GRADIENT DE PRESSION ADVERSE, EXERCE LONGITUDINALEMENT PAR L'INTERMEDIAIRE DE CONDITIONS DE DIRICHLET SUR LES PAROIS LATERALES. UNE ETUDE PARAMETRIQUE, CONCERNANT NOTAMMENT LES NOMBRES DE REYNOLDS ET DE ROSSBY, AINSI QUE LE TYPE DE PROFILS DE VITESSE INITIALE, EST PRESENTEE. UN CRITERE D'ECLATEMENT, LIE A NOMBRE DE ROSSBY, EST OBTENU
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 1992 with total page 1400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis European Aerospace Science and Technology, 1992: A Bibliography with Indexes by :
Download or read book European Aerospace Science and Technology, 1992: A Bibliography with Indexes written by and published by . This book was released on 1993 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States. National Aeronautics and Space Administration. Scientific and Technical Information Division Publisher : ISBN 13 : Total Pages :338 pages Book Rating :4.F/5 ( download)
Book Synopsis Dictionary of Technical Terms for Aerospace Use by : United States. National Aeronautics and Space Administration. Scientific and Technical Information Division
Download or read book Dictionary of Technical Terms for Aerospace Use written by United States. National Aeronautics and Space Administration. Scientific and Technical Information Division and published by . This book was released on 1965 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: Brief definitions "intended to be as clear as possible to the non-expert, but accuracy has not been compromised for the sake of readability. Mathematics has been used where necessary to avoid ambiguity."--Intro. Published 1965.
