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Interactions Ondes Ondes Dans Un Canal Bidimensionnel Etudes Experimentales Et Numeriques
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Book Synopsis Interactions ondes-ondes dans un canal bidimensionnel, études expérimentales et numériques by : Luis Miguel Chagas da Costa Gil
Download or read book Interactions ondes-ondes dans un canal bidimensionnel, études expérimentales et numériques written by Luis Miguel Chagas da Costa Gil and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: DES ETUDES RECENTES ONT REVELE L'IMPORTANCE DES NON-LINEARITES LORS DE L'INTERACTION DE DIFFERENTS SYSTEMES D'ONDES DE SURFACE. DANS CE TRAVAIL, NUMERIQUE ET EXPERIMENTAL, NOUS NOUS PROPOSONS DE CARACTERISER PLUS PRECISEMENT LES EFFETS DES NON-LINEARITES DANS TROIS TYPES DE CAS PARTICULIERS : - L'INTERACTION D'ONDES SOLITAIRES (D'AMPLITUDES EGALES OU DIFFERENTES) - L'INTERACTION DE TRAINS D'ONDES COURTES (IDENTIQUES OU DIFFERENTS) - L'INTERACTION D'UN TRAIN D'ONDES COURTES AVEC UNE ONDE SOLITAIRE. NOUS DISPOSONS D'UN CANAL BI-DIMENSIONNEL, EQUIPE D'UN BATTEUR A CHAQUE EXTREMITE. IL S'AGIT, A NOTRE CONNAISSANCE, D'UN EQUIPEMENT UNIQUE QUI NOUS A PERMIS DE REALISER DES ESSAIS ORIGINAUX. LES MESURES ONT ETE EFFECTUEES A L'AIDE DE SONDES RESISTIVES, D'UN ANEMOMETRE LASER ET D'UN CAPTEUR DE PRESSION. NOUS AVONS EFFECTUE LA SIMULATION NUMERIQUE DE CHACUNE DE NOS MESURES A L'AIDE DE DEUX CODES. LE PREMIER EST FONDE SUR L'HYPOTHESE D'UN ECOULEMENT POTENTIEL (FLUIDE PARFAIT). IL UTILISE LA METHODE DES SINGULARITES. LE SECOND RESOUT LES EQUATIONS DE NAVIER-STOKES POUR L'ECOULEMENT CONSIDERE. EN CE QUI CONCERNE L'INTERACTION DE DEUX ONDES SOLITAIRES, IL EXISTE DES ETUDES ANALYTIQUES. NOS TRAVAUX NUMERIQUES ET EXPERIMENTAUX EN CONFIRMENT LA VALIDITE. MAIS, IL NOUS A ETE POSSIBLE D'ETENDRE CES ETUDES ET D'EN OBTENIR DE NOUVEAUX RESULTATS QUI METTENT BIEN EN EVIDENCE DES EFFETS NON LINEAIRES QUI AFFECTENT LA VITESSE DES PARTICULES FLUIDES ET LE CHAMP DE PRESSION. DANS LE CAS DES INTERACTIONS D'ONDES COURTES, NOUS AVONS PU OBTENIR DES RESULTATS ORIGINAUX RELATIFS AU RETARD DE PHASE ATTRIBUE A CHACUN DES GROUPES DE VAGUES. L'ETUDE DE L'INTERACTION D'UNE ONDE SOLITAIRE AVEC UN TRAIN D'ONDES COURTES N'A PU SE FAIRE QUE NUMERIQUEMENT. NOUS AVONS IDENTIFIE LES CARACTERISTIQUES NON-LINEAIRES DU PHENOMENE ET VERIFIE, POUR LA PREMIERE FOIS, QUELQUES RESULTATS ANALYTIQUES. LA PARTIE EXPERIMENTALE DE CETTE ETUDE A NECESSITE QUE NOUS RESOLVIONS DE NOMBREUX PROBLEMES PRATIQUES LIES A LA GENERATION EN LABORATOIRE D'ONDES BI-DIMENSIONNELLES DE QUALITE ET A LA MESURE DE LEURS DIVERSES CARACTERISTIQUES
Book Synopsis Etudes expérimentales et numériques de la turbulence d'ondes de surface by : Luc Deike
Download or read book Etudes expérimentales et numériques de la turbulence d'ondes de surface written by Luc Deike and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Lorsque des ondes d'amplitudes suffisamment importantes se propagent dans un milieu, elles peuvent interagir et donner naissance à des ondes de longueurs d'onde différentes. L'énergie est transportée par interactions non linéaire et une cascade d'énergie peut alors avoir lieu sur une large gamme d'échelles spatiales, d'une échelle d'injection à une échelle de dissipation. Cette phénoménologie, présentant des analogies formelles avec la turbulence hydrodynamique peut se rencontrer dans de nombreux systèmes physiques tels que les ondes de gravité et de capillarité à la surface de la mer, les ondes internes dans l'océan ou l'atmosphère, les ondes élastiques, les ondes d'Alfvén dans le vent solaire... Dans cette thèse, la dynamique et la statistique d'un ensemble d'ondes de surface en interaction est étudiée dans différents systèmes : les ondes capillaires et de gravité à la surface d'un liquide ainsi que les ondes hydro-élastiques à la surface d'une feuille élastique flottante. Les résultats expérimentaux et numériques sont comparés aux prédictions de la théorie de turbulence d'ondes, aussi appelée turbulence faible. Dans un premier temps, la turbulence d'ondes gravito-capillaires à la surface d'un liquide est étudiée, à la fois en régime stationnaire et instationnaire. Le déclin auto-similaire en temps de la turbulence d'ondes capillaires en déclin est observé expérimentalement, en accord avec le scénario théorique. De plus nous mettons en évidence l'existence de dissipation au sein de la cascade. L'influence de la dissipation à toutes les échelles sur les cascades de turbulence d'ondes est alors étudiée en régime stationnaire : pour une faible dissipation, la dépendance du régime de turbulence d'ondes avec l'échelle est trouvée en accord avec la théorie, cependant nous mettons en évidence un flux d'énergie non constant ; pour une forte dissipation, le régime de turbulence d'ondes est en fort désaccord avec la théorie. Par ailleurs, les premières simulations numériques de turbulence d'ondes capillaires à partir des équations diphasiques de Navier-Stokes (code Gerris) sont présentées. Un spectre d'énergie des vagues en loi de puissance est observé en bon accord avec la théorie. Les cascades inverse et directe de la turbulence d'ondes de gravité sont ensuite étudiées. Nous présentons la première observation expérimentale de la cascade inverse des petites vers les grandes échelles. Les effets de taille finie et l'influence des conditions aux limites sur la cascade directe d'ondes de gravité sont discutés à l'aide d'expérience dans des bassins de grandes tailles. Dans une seconde partie, je m'intéresse aux ondes hydro-élastiques à la surface d'une feuille élastique flottante sur un liquide. Deux régimes d'ondes élastiques sont observés : des ondes de tension et de flexion (respectivement à basse et haute fréquence) en bon accord avec la théorie linéaire. La valeur de la tension de la membrane est contrôlée par la pression hydrostatique imposée sur le système. Lorsque l'amplitude de forçage est augmentée, un décalage significatif de la relation de dispersion non linéaire des ondes est observé, due à une surtension créée par les oscillations lentes du mode fondamental de la feuille. Le processus d'interactions à trois ondes est mis en évidence expérimentalement et un régime de turbulence d'ondes est observé. Un spectre d'énergie des vagues en loi de puissance est toujours observé, avec un exposant en désaccord avec les prédictions théoriques. Différentes hypothèses sont discutées afin d'expliquer ce désaccord, comme l'existence de dissipation à différentes échelles au sein de la zone inertielle, ou l'influence des fortes non linéarités du mode fondamental
Book Synopsis Etudes expérimentales et numériques de la turbulence d'ondes de flexion by : Benjamin Miquel
Download or read book Etudes expérimentales et numériques de la turbulence d'ondes de flexion written by Benjamin Miquel and published by . This book was released on 2013 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les spectres expérimentaux des ondes de flexion dans les plaques élastiques minces diffèrent du spectre de Zakharov, prédit par la théorie de la turbulence d'ondes. La validité et le rôle des deux hypothèses de la turbulence d'ondes -- la séparation d'échelles temporelles et l'existence d'une fenêtre de transparence -- ont été étudiées. La caractérisation de l'amortissement des ondes dans notre système a révélé l'absence d'une fenêtre de transparence. Incorporé à une simulation numérique des équations dynamiques d'une plaque mince, cet amortissement permet de reproduire les spectres expérimentaux, plus raides que le spectre de Zakharov, validant ainsi la pertinence de la description de l'expérience à l'aide de ces équations. La solution de Zakharov est cependant retrouvée lorsque nous annulons la dissipation aux échelles intermédiaires. L'existence d'une fenêtre de transparence apparaît donc comme une condition nécessaire à l'observation des prédictions de la turbulence d'ondes. Enfin, l'hypothèse de la séparation d'échelle temporelle a été validée par une mesure du temps non linéaire associé aux échanges d'énergie entre ondes, utilisant une analyse en paquets d'ondes du mouvement. Cependant, pour les très forts forçages expérimentaux, ce temps non linéaire devient de l'ordre de la période des ondes aux grandes échelles, pour lesquelles le spectre change de forme. Ces observations ont été prolongées grâce aux simulations numériques, qui ont permis d'observer l'apparition d'un régime fortement non linéaire dans lequel prédominent aux grandes échelles les d-cones et les plis.
Book Synopsis Quantum Mechanics, Volume 3 by : Claude Cohen-Tannoudji
Download or read book Quantum Mechanics, Volume 3 written by Claude Cohen-Tannoudji and published by John Wiley & Sons. This book was released on 2019-12-16 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new, third volume of Cohen-Tannoudji's groundbreaking textbook covers advanced topics of quantum mechanics such as uncorrelated and correlated identical particles, the quantum theory of the electromagnetic field, absorption, emission and scattering of photons by atoms, and quantum entanglement. Written in a didactically unrivalled manner, the textbook explains the fundamental concepts in seven chapters which are elaborated in accompanying complements that provide more detailed discussions, examples and applications. * Completing the success story: the third and final volume of the quantum mechanics textbook written by 1997 Nobel laureate Claude Cohen-Tannoudji and his colleagues Bernard Diu and Franck Laloë * As easily comprehensible as possible: all steps of the physical background and its mathematical representation are spelled out explicitly * Comprehensive: in addition to the fundamentals themselves, the books comes with a wealth of elaborately explained examples and applications Claude Cohen-Tannoudji was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris where he also studied and received his PhD in 1962. In 1973 he became Professor of atomic and molecular physics at the Collège des France. His main research interests were optical pumping, quantum optics and atom-photon interactions. In 1997, Claude Cohen-Tannoudji, together with Steven Chu and William D. Phillips, was awarded the Nobel Prize in Physics for his research on laser cooling and trapping of neutral atoms. Bernard Diu was Professor at the Denis Diderot University (Paris VII). He was engaged in research at the Laboratory of Theoretical Physics and High Energy where his focus was on strong interactions physics and statistical mechanics. Franck Laloë was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris. His first assignment was with the University of Paris VI before he was appointed to the CNRS, the French National Research Center. His research was focused on optical pumping, statistical mechanics of quantum gases, musical acoustics and the foundations of quantum mechanics.
Book Synopsis Bulletin Hydraulic Research by : International Association for Hydraulic Research
Download or read book Bulletin Hydraulic Research written by International Association for Hydraulic Research and published by . This book was released on 1966 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flood Routing Methods by : Vujica M. Yevjevich
Download or read book Flood Routing Methods written by Vujica M. Yevjevich and published by . This book was released on 1960 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Boundary-Layer Theory by : Hermann Schlichting (Deceased)
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.
Book Synopsis The Image Processing Handbook by : John C. Russ
Download or read book The Image Processing Handbook written by John C. Russ and published by CRC Press. This book was released on 2006-12-19 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt: Now in its fifth edition, John C. Russ‘s monumental image processing reference is an even more complete, modern, and hands-on tool than ever before. The Image Processing Handbook, Fifth Edition is fully updated and expanded to reflect the latest developments in the field. Written by an expert with unequalled experience and authority, it offers clea
Book Synopsis An Experimental Study of Tidal Bores and Positive Surges by : Christian Koch
Download or read book An Experimental Study of Tidal Bores and Positive Surges written by Christian Koch and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Book Synopsis Water and Land Security in Drylands by : Mohamed Ouessar
Download or read book Water and Land Security in Drylands written by Mohamed Ouessar and published by Springer. This book was released on 2017-04-25 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents recent lessons learned in the context of research and development for various dryland ecosystems, focusing on water resources management, land and vegetation cover degradation and remediation, and socioeconomic aspects, as well as integrated approaches to ensuring water and land security in view of the current and predicted climate change. As water and land are the essential bases of food production, the management of these natural resources is becoming a cornerstone for the development of dryland populations. The book gathers the peer-reviewed, revised versions of the most outstanding papers on these topics presented at the ILDAC2015 Conference in Djerba, Tunisia.
Book Synopsis Physics of Solitons by : Thierry Dauxois
Download or read book Physics of Solitons written by Thierry Dauxois and published by Cambridge University Press. This book was released on 2006-03-09 with total page 435 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook gives an instructive view of solitons and their applications for advanced students of physics.
Book Synopsis Nonlinear Waves and Pattern Dynamics by : Nizar Abcha
Download or read book Nonlinear Waves and Pattern Dynamics written by Nizar Abcha and published by Springer. This book was released on 2018-04-20 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book addresses the fascinating phenomena associated with nonlinear waves and spatio-temporal patterns. These appear almost everywhere in nature from sand bed forms to brain patterns, and yet their understanding still presents fundamental scientific challenges. The reader will learn here, in particular, about the current state-of-the art and new results in: Nonlinear water waves: resonance, solitons, focusing, Bose-Einstein condensation, as well as and their relevance for the sea environment (sea-wind interaction, sand bed forms, fiber clustering) Pattern formation in non-equilibrium media: soap films, chimera patterns in oscillating media, viscoelastic Couette-Taylor flow, flow in the wake behind a heated cylinder, other pattern formation. The editors and authors dedicate this book to the memory of Alexander Ezersky, Professor of Fluid Mechanics at the University of Caen Normandie (France) from September 2007 to July 2016. Before 2007, he had served as a Senior Scientist at the Institute of Applied Physics of the Russian Academy of Sciences in Nizhny Novgorod (Russia). The chapters have been written by leading scientists in Nonlinear Physics, and the topics chosen so as to cover all the fields to which Prof. Ezersky himself contributed, by means of experimental, theoretical and numerical approaches. The volume will appeal to advanced students and researchers studying nonlinear waves and pattern dynamics, as well as other scientists interested in their applications in various natural media.
Book Synopsis Bibliography and Discussion of Flood-routing Methods and Unsteady Flow in Channels by : Vujica M. Yevjevich
Download or read book Bibliography and Discussion of Flood-routing Methods and Unsteady Flow in Channels written by Vujica M. Yevjevich and published by . This book was released on 1964 with total page 706 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Acoustics, Aeroacoustics and Vibrations by : Fabien Anselmet
Download or read book Acoustics, Aeroacoustics and Vibrations written by Fabien Anselmet and published by John Wiley & Sons. This book was released on 2016-01-07 with total page 529 pages. Available in PDF, EPUB and Kindle. Book excerpt: This didactic book presents the main elements of acoustics, aeroacoustics and vibrations. Illustrated with numerous concrete examples linked to solid and fluid continua, Acoustics, Aeroacoustics and Vibrations proposes a selection of applications encountered in the three fields, whether in room acoustics, transport, energy production systems or environmental problems. Theoretical approaches enable us to analyze the different processes in play. Typical results, mostly from numerical simulations, are used to illustrate the main phenomena (fluid acoustics, radiation, diffraction, vibroacoustics, etc.).
Book Synopsis Artificial Intelligence in Society by : OECD
Download or read book Artificial Intelligence in Society written by OECD and published by OECD Publishing. This book was released on 2019-06-11 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: The artificial intelligence (AI) landscape has evolved significantly from 1950 when Alan Turing first posed the question of whether machines can think. Today, AI is transforming societies and economies. It promises to generate productivity gains, improve well-being and help address global challenges, such as climate change, resource scarcity and health crises.
Book Synopsis Practice Make Perfect French Vocabulary by : Eliane Kurbegov
Download or read book Practice Make Perfect French Vocabulary written by Eliane Kurbegov and published by McGraw Hill Professional. This book was released on 2011-09-02 with total page 239 pages. Available in PDF, EPUB and Kindle. Book excerpt: Master the words and phrases necessary for handling everyday situations Practice Makes Perfect: French Vocabulary helps you develop your vocabulary by providing practice in word-building and encouraging you to analyze new words for an ever-increasing vocabulary. Each chapter of this comprehensive book focuses on a theme, such as family or travel, so you can build your language skills in a systematic manner. As you lay the foundation for an increasing vocabulary, you are able to perfect your new words with plenty of exercises and gain the confidence to communicate well in French. Practice Makes Perfect: French Vocabulary offers you: More than 120 exercises Concise grammatical explanations A new chapter on contemporary vocabulary An answer key to gauge your comprehension With help from this book, you can easily speak or write in French about: Different occupations and jobs * French holidays and traditions * Taking the train * Growing your own garden * Where it hurts on your body * Your house * Your family and friends * What you studied in school * Your favorite TV show * Your family's background . . . and much more!
