Download or read book Simulation num rique et analyse physique d un jet propulsif contr l par des injections radiales written by Nicolas Chauvet and published by . This book was released on 2007 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: A cause de sa température élevée, le jet propulsif d'un avion de combat est une source de rayonnement infrarouge qui rend l'appareil très vulnérable. Ce rayonnement peut toutefois être réduit en accélérant le mélange du jet avec l'atmosphère. Cette thèse est consacrée à la simulation numérique d'un jet propulsif réaliste contrôlé par des injections radiales et à l'analyse physique des mécanismes d'augmentation de son mélange. Deux types de simulations, RANS et ZDES, ont été réalisés sur la base du modèle de Spalart-Allmaras. Dans le modèle ZDES, une nouvelle longueur caractéristique de maille est formulée et améliore sensiblement la prévision de la région initiale du jet. Globalement, les simulations ZDES restituent fidèlement le champ moyen du jet supersonique sans et avec contrôle, aussi bien les cellules de détente/compression que la diffusion turbulente. L'analyse physique est dédiée à la compréhension d'une part des mécanismes compressibles concentrées au coeur du jet et d'autre part des mécanismes tourbillonnaires périphériques ainsi qu'à l'évaluation de leurs rôles respectifs dans l'augmentation du mélange. Il en ressort que l'augmentation du mélange est exclusivement due aux mécanismes tourbillonnaires. Une étude paramétrique fournit des indications pour concevoir un mélangeur efficace. L'analyse des tourbillons focalisée sur le régime lointain quasi-bidimensionnel souligne leur dynamique moyenne et fait apparaître l'action des fluctuations turbulentes sur leur taux de dégénérescence. Enfin, deux régimes de contrôle sont identifiés et associés aux pénétrations respectivement quasi-stationnaire et intermittente des jets secondaires.
Download or read book Compressibility Turbulence and High Speed Flow written by Thomas B. Gatski and published by Academic Press. This book was released on 2013-03-05 with total page 343 pages. Available in PDF, EPUB and Kindle. Book excerpt: Compressibility, Turbulence and High Speed Flow introduces the reader to the field of compressible turbulence and compressible turbulent flows across a broad speed range, through a unique complimentary treatment of both the theoretical foundations and the measurement and analysis tools currently used. The book provides the reader with the necessary background and current trends in the theoretical and experimental aspects of compressible turbulent flows and compressible turbulence. Detailed derivations of the pertinent equations describing the motion of such turbulent flows is provided and an extensive discussion of the various approaches used in predicting both free shear and wall bounded flows is presented. Experimental measurement techniques common to the compressible flow regime are introduced with particular emphasis on the unique challenges presented by high speed flows. Both experimental and numerical simulation work is supplied throughout to provide the reader with an overall perspective of current trends. - An introduction to current techniques in compressible turbulent flow analysis - An approach that enables engineers to identify and solve complex compressible flow challenges - Prediction methodologies, including the Reynolds-averaged Navier Stokes (RANS) method, scale filtered methods and direct numerical simulation (DNS) - Current strategies focusing on compressible flow control
Download or read book Analyse physique mod lisation et simulation num rique des m canismes de m lange dans les jets simples et coaxiaux turbulents written by Gilles Harran and published by . This book was released on 1994 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: LE BUT DE CETTE THESE EST L'ANALYSE PHYSIQUE, LA MODELISATION ET LA SIMULATION NUMERIQUE DES MECANISMES DE MELANGE DANS LES JETS A MASSE VOLUMIQUE VARIABLE SOUS L'EFFET DE FORTES INCIDENCES DE DENSITE. DANS UN PREMIER TEMPS, L'OUTIL DE CALCUL PAR RESOLUTION DES EQUATIONS PARABOLIQUES DE PRANDTL AVEC MODELISATION AU SECOND ORDRE EST VALIDE PAR UNE DOUBLE COMPARAISON AVEC L'EXPERIENCE EN SITUATION ISOVOLUME ET A DENSITE VARIABLE. PUIS, UNE REFLEXION EST MENEE SUR L'INFLUENCE DU CHOIX DE REGROUPEMENT STATISTIQUE SUR LA PREDETERMINATION DES PROPRIETES DE MELANGE DES JETS HETEROGENES. L'ANALYSE S'APPUIE SUR LA COMPARAISON DE MODELES ANALOGUES EN MOYENNE PONDEREE PAR LA MASSE VOLUMIQUE OU NON PONDEREE PAR LA MASSE VOLUMIQUE. UNE ETUDE PARAMETRIQUE PERMET DE DETERMINER DES EFFETS DE DENSITE SUR LE DEVELOPPEMENT D'UN JET TURBULENT DE FACON COGNITIVE MAIS AUSSI ANALYTIQUE. L'INFLUENCE DE PARAMETRES, TELS QUE LA GRAVITE ET LES CONDITIONS D'EMISSION EST EGALEMENT DISCUTEE. ENFIN, SONT ABORDES LES ASPECTS SPECIFIQUES DE LA CONFIGURATION GEOMETRIQUE DE JETS COAXIAUX QUI PRESENTE UN INTERET APPLICATIF A L'INJECTION DANS LA CHAMBRE DE COMBUSTION DES MOTEURS FUSEES
Download or read book Analyse physique mod lisation et simulation num rique des jets simples et des jets coaxiaux turbulents compressibles et instationnaires written by Philippe Reynier (ingénieur) and published by . This book was released on 1995 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: CETTE THESE A POUR OBJET L'ANALYSE PHYSIQUE, LA MODELISATION ET LA SIMULATION NUMERIQUE DES JETS RONDS ET DES JETS COAXIAUX TURBULENTS COMPRESSIBLES ET INSTATIONNAIRES. TOUT D'ABORD, NOUS AVONS PROCEDE A UNE REVUE DES CONNAISSANCES EXISTANTES SUR LES ECOULEMENTS ETUDIES AVEC UN EFFORT PARTICULIER AU NIVEAU DE L'ETUDE DES INSTABILITES DANS LA REGION PROCHE DES JETS. PUIS, L'ASPECT DE LA MODELISATION DU PROBLEME PHYSIQUE EST ABORDE AVEC L'EXPOSE DES DIFFERENTS NIVEAUX DE FERMETURE UTILISES DANS LES EQUATIONS DE NAVIER-STOKES. ENSUITE, L'ASPECT NUMERIQUE EST PRESENTE A TRAVERS LA DESCRIPTION DETAILLEE DU SCHEMA AUX VOLUMES FINIS UTILISE POUR LES SIMULATIONS INDIRECTES. L'ETUDE DU JET ROND COMPRESSIBLE A PERMIS DE METTRE EN EVIDENCE LES EFFETS DE COMPRESSIBILITE SUR LA STABILISATION DE L'ECOULEMENT AINSI QUE L'INFLUENCE DES CONDITIONS D'ENTREE SUR LA PRESENCE D'INSTABILITES DANS LA REGION PROCHE. ENFIN, SONT PRESENTES LES RESULTATS DES SIMULATIONS DE JETS COAXIAUX DANS DES CONFIGURATIONS HOMOGENES ET HETEROGENES. CETTE DERNIERE PARTIE A POUR INTERET INDUSTRIEL L'ETUDE DES PHENOMENES PHYSIQUES LIES A L'INJECTION DANS LES MOTEURS FUSEES CRYOTECHNIQUES
Download or read book Simulation num rique des grandes chelles d un jet propulsif en sortie de moteur d avion avec mod lisation microphysique des particules de glace written by Sitraka Razanamparany and published by . This book was released on 2021 with total page 187 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Instabilit s hydrodynamiques des jets en syst mes liquide fluide written by Mama Chacha and published by . This book was released on 1995 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: LE MEMOIRE DE THESE PRESENTE UNE INVESTIGATION DES MECANISMES PHYSIQUES QUI REGISSENT L'ECOULEMENT D'UN JET DE LIQUIDE AXISYMETRIQUE DANS UNE PHASE CONTINUE NON MISCIBLE. APRES AVOIR DEFINI LES LIMITES DES TRAVAUX EXISTANTS, LE COMPORTEMENT SPATIO-TEMPOREL DE CES SYSTEMES EST ETUDIE AU MOYEN D'UNE SIMULATION NUMERIQUE DIRECTE. LE SYSTEME PHYSIQUE JET-PHASE CONTINUE EST CONFINE DANS UNE ENCEINTE COAXIALE RIGIDE. LE MODELE MATHEMATIQUE TRAITE DES JETS INFINIS ET DES JETS SEMI-INFINIS. CE MODELE PREND EN COMPTE L'ENSEMBLE DES PARAMETRES PHYSIQUES DU SYSTEME. L'APPROCHE NUMERIQUE ADOPTEE PERMET UNE GRANDE PRECISION ET FACILITE LE TRAITEMENT DE LA SURFACE DU JET. LE CODE DE CALCUL PERMET DE SUIVRE L'EVOLUTION DU SYSTEME ET DE CONNAITRE LA POSITION EXACTE DE L'INTERFACE DEPUIS L'INITIATION D'UNE PERTURBATION JUSQU'A LA RUPTURE EVENTUELLE DU JET EN GOUTTES. EN PRESENCE DE NONLINEARITES, LE CRITERE DE STABILITE DE RAYLEIGH-PLATEAU DEVIENT DEPENDANT DE L'AMPLITUDE INITIALE DE LA PERTURBATION ET LA DESINTEGRATION DU JET PRODUIT DES GOUTTES DE TAILLE DIFFERENTE. POUR LES SYSTEMES TYPIQUES ETUDIES, LES GOUTTES SECONDAIRES SONT OBTENUES POUR TOUS LES NOMBRES D'ONDE INSTABLE. L'INFLUENCE DES PROPRIETES PHYSIQUES ET DU CONFINEMENT SUR L'INSTABILITE ET LA RUPTURE DU JET EST MISE EN EVIDENCE. CE CODE DE CALCUL PEUT TRAITER UNE CLASSE ETENDUE DE PROBLEMES D'ECOULEMENT AVEC INTERFACES MOBILES.
Download or read book Simulation num rique d effets de jets r acteurs par r solution des quations d Euler autour de configurations motoris es d avions de transport en r gime transsonique written by Aybike Molbay-Arsan and published by . This book was released on 1993 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: POUR AMELIORER L'INSTALLATION DU SYSTEME PROPULSIF SUR L'AVION, IL EST NECESSAIRE D'AVOIR UNE BONNE COMPREHENSION DES PHENOMENES D'INTERACTION INSTALLATION MOTRICE-AVION ET PAR CONSEQUENT DE BIEN SIMULER L'ECOULEMENT AUTOUR DE L'AVION TOUT EN MODELISANT LE JET DU MOTEUR DE MANIERE REALISTE. L'OBJECTIF DE CETTE THESE EST DE SIMULER L'ECOULEMENT AERODYNAMIQUE A L'INTERIEUR ET AUTOUR DES GEOMETRIES DE TUYERE AFIN D'ETUDIER DIFFERENTS ASPECTS COMME L'ANALYSE DES TUYERES A POUSSEE ORIENTEE; DE MODELISER L'ECOULEMENT AERODYNAMIQUE AUTOUR D'AVIONS DE TRANSPORT BIMOTEUR ET QUADRIMOTEUR EN REGIME DE CROISIERE ET D'ANALYSER L'EFFET DES JETS DES MOTEURS; DE VALIDER CES SIMULATIONS NUMERIQUES PAR COMPARAISON AVEC DES RESULTATS EXPERIMENTAUX. CES SIMULATIONS SONT EFFECTUEES AVEC LE CODE DE CALCUL SESAME, DEVELOPPE PAR L'ONERA. SESAME RESOUT LES EQUATIONS D'EULER QUI CONSTITUENT UN COMPROMIS ENTRE LA COMPLEXITE D'UNE GEOMETRIE AVION COMPLET (FUSELAGE, VOILURE, MAT, NACELLE, TUYERE) QUE L'ON NE PEUT TRAITER ACTUELLEMENT DE MANIERE INDUSTRIELLE AVEC LES EQUATIONS DE NAVIER-STOKES, ET CELLE DE L'ECOULEMENT QUI COMPORTE DES SURFACES DE DISCONTINUITES ET DES ZONES DE DIFFERENTES CONDITIONS GENERATRICES. AFIN DE REALISER CES SIMULATIONS, LES DEVELOPPEMENTS NECESSAIRES SONT LA MISE EN PLACE D'OUTILS DE PRE ET POST-TRAITEMENT AU CODE SESAME; ET L'IMPLANTATION DE NOUVELLES CONDITIONS AUX LIMITES DANS SESAME AFIN DE POUVOIR SIMULER LE JET D'UNE TUYERE. LES SIMULATIONS ET LES ANALYSES SUR DES CONFIGURATIONS DE TUYERE ISOLEE ET D'AVION AVEC L'INSTALLATION MOTRICE SONT SOUVENT EFFECTUEES PARALLELEMENT A DES CAMPAGNES D'ESSAIS EN SOUFFLERIE. CECI DONNE LA POSSIBILITE D'EFFECTUER DES COMPARAISONS ENTRE LES RESULTATS DE CALCUL ET DES RESULTATS EXPERIMENTAUX, ET DE JUGER LA QUALITE DES SIMULATIONS NUMERIQUES. EN OUTRE, LE CALCUL NUMERIQUE PERMET D'ANALYSER LES ECOULEMENTS COMPLEXES, ET QUELQUEFOIS D'ECLAIRCIR DES PHENOMENES OBSERVES MAIS NON EXPLIQUES PAR DES ESSAIS EN SOUFFLERIE, EN RAISON DE MANQUE D'INFORMATIONS
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.
Download or read book Solid Propellant Rocket Research written by Martin Summerfield and published by Elsevier. This book was released on 2013-11-11 with total page 713 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solid Propellant Rocket Research
Download or read book Advances in Turbulence VII written by Uriel Frisch and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 630 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Turbulence VII contains an overview of the state of turbulence research with some bias towards work done in Europe. It represents an almost complete collection of the invited and contributed papers delivered at the Seventh European Turbulence Conference, sponsored by EUROMECH and ERCOFTAC and organized by the Observatoire de la Côte d'Azur. New high-Reynolds number experiments combined with new techniques of imaging, non-intrusive probing, processing and simulation provide high-quality data which put significant constraints on possible theories. For the first time, it has been shown, for a class of passive scalar problems, why dimensional analysis sometimes gives the wrong answers and how anomalous intermittency corrections can be calculated from first principles. The volume is thus geared towards specialists in the area of flow turbulence who could not attend the conference as well as anybody interested in this rapidly moving field.
Download or read book Multiscale and Multiresolution Approaches in Turbulence written by Pierre Sagaut and published by World Scientific. This book was released on 2013 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book aims to provide the reader with an updated general presentation of multiscale/multiresolution approaches in turbulent flow simulations. All modern approaches (LES, hybrid RANS/LES, DES, SAS) are discussed and recast in a global comprehensive framework. Both theoretical features and practical implementation details are addressed. Some full scale applications are described, to provide the reader with relevant guidelines to facilitate a future use of these methods.
Download or read book ICREEC 2019 written by Ahmed Belasri and published by Springer Nature. This book was released on 2020-06-10 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
Download or read book Complex Effects in Large Eddy Simulations written by Stavros Kassinos and published by Springer Science & Business Media. This book was released on 2007-07-16 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of Large Eddy Simulations is reaching a level of maturity that brings this approach to the mainstream of engineering computations, while it opens opportunities and challenges. The main objective of this volume is to bring together leading experts in presenting the state-of-the-art and emerging approaches for treating complex effects in LES. A common theme throughout is the role of LES in the context of multiscale modeling and simulation.
Download or read book Advances in Renewable Hydrogen and Other Sustainable Energy Carriers written by Abdallah Khellaf and published by Springer Nature. This book was released on 2020-08-19 with total page 517 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines a broad range of advances in hydrogen energy and alternative fuel developments and their role in the energy transition. The respective contributions were presented at the International Symposium on Sustainable Hydrogen, held in Algiers, Algeria on November 27-28, 2019. The transition from non-renewable polluting energy to sustainable green energy requires not only new energy sources but also new storage techniques and smart energy management. This situation has sparked renewed interest in hydrogen and alternative fuels, as they could help meet these needs. Indeed, hydrogen can not only be used as a clean energy vector or as an alternative fuel, but also as a storage medium or as an intermediary that enables improved energy management. This text offers a valuable reference guide for those working in the professional energy sector, as well as for students and instructors in academia who want to learn about the state of the art and future directions in the fields of hydrogen energy, alternative fuels and sustainable energy development.
Download or read book Technological Developments in Education and Automation written by Magued Iskander and published by Springer Science & Business Media. This book was released on 2010-01-30 with total page 553 pages. Available in PDF, EPUB and Kindle. Book excerpt: Technological Developments in Education and Automation includes set of rigorously reviewed world-class manuscripts dealing with the increasing role of technology in daily lives including education and industrial automation Technological Developments in Education and Automation contains papers presented at the International Conference on Industrial Electronics, Technology & Automation and the International Conference on Engineering Education, Instructional Technology, Assessment, and E-learning which were part of the International Joint Conferences on Computer, Information and Systems Sciences and Engineering
Download or read book Multiphysics Modelling and Simulation for Systems Design and Monitoring written by Mohamed Haddar and published by Springer. This book was released on 2016-10-08 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reports on the state of the art in the field of multiphysics systems. It consists of accurately reviewed contributions to the MMSSD’2014 conference, which was held from December 17 to 19, 2004 in Hammamet, Tunisia. The different chapters, covering new theories, methods and a number of case studies, provide readers with an up-to-date picture of multiphysics modeling and simulation. They highlight the role played by high-performance computing and newly available software in promoting the study of multiphysics coupling effects, and show how these technologies can be practically implemented to bring about significant improvements in the field of design, control and monitoring of machines. In addition to providing a detailed description of the methods and their applications, the book also identifies new research issues, challenges and opportunities, thus providing researchers and practitioners with both technical information to support their daily work and a new source of inspiration for their future research.
Download or read book Theoretical and Numerical Combustion written by Thierry Poinsot and published by R.T. Edwards, Inc.. This book was released on 2005 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introducing numerical techniques for combustion, this textbook describes both laminar and turbulent flames, addresses the problem of flame-wall interaction, and presents a series of theoretical tools used to study the coupling phenomena between combustion and acoustics. The second edition incorporates recent advances in unsteady simulation methods,
