Download or read book Etude de l tablissement du r gime turbulent entre deux parois parall les written by Larbi Labraga and published by . This book was released on 1984 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: Etude expérimentale à faibles nombres de Reynolds. La numérisation du signal anémométrique instantané permet de calculer les moments statistiques jusqu'à l'ordre 4. Mesure directe du frottement pariétal, calcul des paramètres de la couche limite et des coefficients de dissymétrie et d'aplatissement des composantes de la vitesse. Caractérisation des différents régimes d'écoulement, localisation des zones laminaire, transitionnelle et turbulente

Download or read book tude de la structure d un coulement turbulent entre deux plaques parall les rugueuses prise en compte de la tridimensionnalit de la rugosit written by Abderrahmane Mazouz and published by . This book was released on 1994 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nous avons entrepris d'étudier l'établissement du régime d'écoulement entre deux plaques parallèles rugueuses et plus particulièrement l'influence d'une dimension caractéristique de la rugosité en régime d'écoulement turbulent établi sur les caractéristiques du champ moyen d'écoulement et les mécanismes lies à la structure de la tension de Reynolds. L'effet principal de la rugosité est d'altérer la structure de l'écoulement. Pour un régime d'écoulement donné, le recours aux rugosités artificielles en forme de barres perpendiculaires à la direction principale de l'écoulement a permis de mettre en évidence l'influence des caractéristiques géométriques de la rugosité, tels la hauteur moyenne k, l'espacement longitudinal p, la distance latérale l. Cette étude a pour objet l'influence du paramètre l/k sur la structure de l'écoulement turbulent entre deux plaques parallèles rugueuses. A la lumière des résultats obtenus, nous avons pu mettre en évidence qu'en régime complètement rugueux, la loi logarithmique de paroi dépend de la nature géométrique de la rugosité et que la valeur du coefficient de frottement en régime établi varie dans le même sens que le paramètre l/k. L'analyse conditionnelle a permis de mettre en évidence la forte contribution des phases d'éjections et de balayages à la production de la tension de Reynolds. De plus, les éjections sont plus intenses sur les rugosités bidimensionnelles dans une grande partie de l'écoulement turbulent. L'analyse spectrale a montré que le spectre d'énergie de la fluctuation longitudinale de la vitesse s'organise en une loi puissance 4/3 au voisinage de la paroi

Download or read book Etude des structures de la turbulence entre deux parois parall les lisses ou rugueuses written by Samuel Demare and published by . This book was released on 1999 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: DES TECHNIQUES DE TRAITEMENT DE SIGNAUX OBTENUS A PARTIR DE L'ANEMOMETRIE A FILS CHAUDS SONT MISES EN UVRE AFIN DE CARACTERISER LES STRUCTURES DE LA TURBULENCE PRESENTES DANS UN ECOULEMENT TURBULENT PLEINEMENT DEVELOPPE ENTRE DEUX PAROIS PARALLELES LISSES OU RUGUEUSES. DANS UN PREMIER TEMPS, L'ARSENAL CLASSIQUE UTILISANT LES METHODES CONVENTIONNELLES A ETE MIS EN UVRE (MOMENTS, ANALYSE SPECTRALE. DANS UN SECOND TEMPS, UNE APPROCHE FONDEE SUR LES METHODES CONDITIONNELLES A ETE INTRODUITE ET A PERMIS EN PARTICULIER D'EXTRAIRE LA PARTIE COHERENTE DU SIGNAL ET DE L'ANALYSER. LES INFORMATIONS PARTIELLES FOURNIES PAR CHACUNE DE CES TECHNIQUES SONT MISES EN RELATION LES UNES PAR RAPPORT AUX AUTRES POUR ABOUTIR A UNE VISION PLUS COMPLETE DES PHENOMENES ET METTENT EN EVIDENCE L'INFLUENCE DES RUGOSITES DE TYPE K SUR LES STRUCTURES DE LA TURBULENCE. DES DIFFERENCES ENTRE LES ECOULEMENTS SE DEVELOPPANT SUR PAROIS LISSES ET CEUX SE DEVELOPPANT SUR PAROIS RUGUEUSES APPARAISSENT NON SEULEMENT AU VOISINAGE DE LA PAROI MAIS AUSSI DANS LA REGION CENTRALE DE L'ECOULEMENT REMETTANT EN CAUSE L'HYPOTHESE DE SIMILITUDE DE TOWNSEND. DIFFERENTS ALGORITHMES DE DETECTION DES STRUCTURES COHERENTES (MODUL, VITA, WAG, TERA, ANALYSE DES QUADRANTS) AINSI QU'UNE NOUVELLE METHODE FONDEE SUR LA TRANSFORMEE EN ONDELETTES ONT ETE UTILISEES AFIN D'EVALUER LE TEMPS MOYEN ENTRE BURSTS QUI, ASSOCIE AUX VARIABLES, FORME UN GROUPEMENT ADIMENSIONNEL DONT LA VALEUR NE DEPEND PAS DU NOMBRE DE REYNOLDS, POUR LA GAMME DES NOMBRES CONSIDERES, AUSSI BIEN SUR PAROIS LISSES QUE SUR PAROIS RUGUEUSES. CE GROUPEMENT TRADUIT L'INTERACTION EXISTANT ENTRE LES REGIONS INTERNES ET EXTERNES DE L'ECOULEMENT. CEPENDANT, LA POSSIBILITE QUE LES GROUPEMENTS UTILISANT LES VARIABLES INTERNES NE DEPENDENT PAS DU NOMBRE DE REYNOLDS N'EST PAS A EXCLURE LORSQUE CE DERNIER EST SUFFISAMMENT ELEVE. BIEN QUE DES DIFFERENCES SUR LA NATURE ET L'INTENSITE DES BURSTS PUISSENT EXISTER ENTRE LES PAROIS LISSES ET RUGUEUSES, LES RESULTATS OBTENUS SUGGERENT QUE LE PROCESSUS DE BURSTING EST CONTROLE PAR UN MECANISME SIMILAIRE POUR LES DEUX TYPES D'ECOULEMENT.

Download or read book Large Eddy Simulations of Turbulence written by M. Lesieur and published by Cambridge University Press. This book was released on 2005-08-22 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Large-Eddy Simulations of Turbulence is a reference for LES, direct numerical simulation and Reynolds-averaged Navier-Stokes simulation.

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.

Download or read book Boundary Layer Theory written by Hermann Schlichting (Deceased) and published by Springer. This book was released on 2016-10-04 with total page 814 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new edition of the near-legendary textbook by Schlichting and revised by Gersten presents a comprehensive overview of boundary-layer theory and its application to all areas of fluid mechanics, with particular emphasis on the flow past bodies (e.g. aircraft aerodynamics). The new edition features an updated reference list and over 100 additional changes throughout the book, reflecting the latest advances on the subject.

Download or read book Educational Planning written by Jacques Hallak and published by Routledge. This book was released on 2018-10-24 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: First published in 1995. Routledge is an imprint of Taylor & Francis, an informa company.

Download or read book The Foucault Effect written by Michel Foucault and published by University of Chicago Press. This book was released on 1991-07-09 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on Foucault's 1978 and 1979 lectures on rationalities of government, this work examines the art or activity of government and the different ways in which it has been made thinkable and practicable. There are also contributions of other scholars exploring modern manifestations of government.

Download or read book Bulletin de L Institut International Du Froid written by and published by . This book was released on 1978 with total page 828 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Black Morocco written by Chouki El Hamel and published by Cambridge University Press. This book was released on 2014-02-27 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt: Black Morocco: A History of Slavery, Race, and Islam chronicles the experiences, identity and achievements of enslaved black people in Morocco from the sixteenth century to the beginning of the twentieth century. Chouki El Hamel argues that we cannot rely solely on Islamic ideology as the key to explain social relations and particularly the history of black slavery in the Muslim world, for this viewpoint yields an inaccurate historical record of the people, institutions and social practices of slavery in Northwest Africa. El Hamel focuses on black Moroccans' collective experience beginning with their enslavement to serve as the loyal army of the Sultan Isma'il. By the time the Sultan died in 1727, they had become a political force, making and unmaking rulers well into the nineteenth century. The emphasis on the political history of the black army is augmented by a close examination of the continuity of black Moroccan identity through the musical and cultural practices of the Gnawa.

Download or read book The New World of Work written by Vaughan-Whitehead, Daniel and published by Edward Elgar Publishing. This book was released on 2021-12-16 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt: Actors in the world of work are facing an increasing number of challenges, including automatization and digitalization, new types of jobs and more diverse forms of employment. This timely book examines employer and worker responses, challenges and opportunities for social dialogue, and the role of social partners in the governance of the world of work.

Download or read book Berichte ber Di Tagung written by International Association for Hydraulic Research and published by . This book was released on 1957 with total page 734 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The cole Royale Militaire written by Haroldo A. Guízar and published by Springer Nature. This book was released on 2020-08-24 with total page 313 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explores the Paris Ecole Militaire as an institution, arguing for its importance as a school that presented itself as a model for reform during a key moment in the movement towards military professionalism as well as state-run secular education. The school is distinguished for being an Enlightenment project, one of its founders publishing an article on it in the Encyclopédie in 1755. Its curriculum broke completely with the Latin pedagogy of the dominant Jesuit system, while adapting the legacy of seventeenth-century riding academies. Its status touches on the nature of absolutism, as it was conceived to glorify the Bourbon dynasty in a similar way to the girls’ school at Saint Cyr and the Invalides. It was also a dispensary of royal charity calculated to ally the nobility more closely to royal interests through military service. In the army, its proofs of nobility were the model for the much debated 1781 Ségur decree, often described as a notable cause of the French Revolution.

Download or read book Hydrodynamic Instabilities written by François Charru and published by Cambridge University Press. This book was released on 2011-06-30 with total page 411 pages. Available in PDF, EPUB and Kindle. Book excerpt: The instability of fluid flows is a key topic in classical fluid mechanics because it has huge repercussions for applied disciplines such as chemical engineering, hydraulics, aeronautics, and geophysics. This modern introduction is written for any student, researcher, or practitioner working in the area, for whom an understanding of hydrodynamic instabilities is essential. Based on a decade's experience of teaching postgraduate students in fluid dynamics, this book brings the subject to life by emphasizing the physical mechanisms involved. The theory of dynamical systems provides the basic structure of the exposition, together with asymptotic methods. Wherever possible, Charru discusses the phenomena in terms of characteristic scales and dimensional analysis. The book includes numerous experimental studies, with references to videos and multimedia material, as well as over 150 exercises which introduce the reader to new problems.

Download or read book The Diary and Letters of Gouverneur Morris written by Gouverneur Morris and published by . This book was released on 1888 with total page 690 pages. Available in PDF, EPUB and Kindle. Book excerpt: A biography of Gouverneur Morris (1752-1816) by his granddaughter, making extensive use of his letters and diary.

Download or read book Dynamics of Spatio Temporal Cellular Structures written by Innocent Mutabazi and published by Springer Science & Business Media. This book was released on 2005-12-15 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book La Bagarre written by Steven Laurence Kaplan and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is my hope that this publication of a "lost" work by Galiani will interest scholars of many nations and disciplines. Few writers could make a more compelling claim upon such a cosmopolitan audience. An Italian with deep roots in his homeland, Galiani achieved celebrity in the salons of Paris. An ecclesiastic, his most notable concerns were worldly, to say the least. An erudite classicist, Galiani was passionately concerned about economics and technology. A philosophe and ostensibly something of a subversive, he was enthralled by power and he served for many years as a government agent and adviser at home and abroad. Galiani embodied many of the preoccupations and paradoxes of the Enlightenment. His torians and literary analysts devoted to the study of the lumie'res through out Europe are bound to find Galiani's work important. In recent years there has been an efflorescence of interest in the history of political economy and its relationship not only to the history of ideas but also to the history of social structure, economic development, admin istrative institutions, collective mentalities, and political mobilization. Galiani's work helps to crystalize many of these connections which scholarly specialization has tended to obscure. Galiani had a leading voice in one of the most significant debates in the eighteenth century on the implications of radical economic, social, and institutional change.