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Modelisation Et Controle Decoulements A Surface Libre Par La Methode De Boltzmann Sur Reseau
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Book Synopsis Modélisation et contrôle d’écoulements à surface libre par la méthode de Boltzmann sur réseau by : Olivier Marcou
Download or read book Modélisation et contrôle d’écoulements à surface libre par la méthode de Boltzmann sur réseau written by Olivier Marcou and published by . This book was released on 2010 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail de thèse traite de la modélisation et la simulation des systèmes complexes et s’inscrit dans la thématique du contrôle et la gestion des ressources en eau. Nous proposons une approche originale basée sur les modèles de Boltzmann sur réseau pour représenter les écoulements au sein des canaux d’irrigation, habituellement décrits par les équations non linéaires de Saint-Venant. Nous avons adapté un modèle bi-fluide et étudié les conditions aux bords qui permettent de reproduire la géométrie d’un canal à surface libre. Des méthodes de détermination des grandeurs hydrauliques d’intérêt ont été développées. Nous nous sommes intéressés au comportement des vannes de fond en régime noyé, et nous démontrons que le modèle permet de décrire celui-ci spontanément dans différentes situations de fonctionnement. Des validations ont été effectuées par le biais d’une comparaison avec des expérimentations menées sur un micro-canal expérimental. Nous avons également introduit dans le modèle des phénomènes de sédimentation et étudié l’influence de la présence d’un dépôt de sédiments sur l’écoulement. Là aussi, les résultats de simulation et d’expérimentation convergent.
Book Synopsis Modélisation et analyse des systèmes à paramètres distribués non linéaires par la méthode de Boltzmann sur réseau by : Diemer Anda Ondo
Download or read book Modélisation et analyse des systèmes à paramètres distribués non linéaires par la méthode de Boltzmann sur réseau written by Diemer Anda Ondo and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nous étudions dans cette thèse, composée de deux parties, la modélisation des écoulements en eaux peu profondes par la méthode de Boltzmann sur réseau et l'analyse des propriétés de commandabilité et d'observabilité des modèles obtenus. Dans la première partie, nous nous consacrons d'abord à la modélisation par la méthode de Boltzmann sur réseau des équations de Saint-Venant. En utilisant une linéarisation autour d'un profil d'équilibre, une représentation sous forme d'état des modèles de Boltzmann sur réseau est définie. Cette représentation incorpore les termes de force, et permet une définition complète des entrées (commandes) et des sorties (mesures). Nous représentons ensuite les phénomènes de sédimentation dans les écoulements en eaux peu profondes avec la méthode de Boltzmann sur réseau. Ce modèle défini en une dimension est validé numériquement en le comparant avec un modèle de volumes finis qui résout les équations de Saint-Venant-Exner. Le modèle LB défini est moins gourmand en temps de calcul et plus facile à manipuler que les modèles traditionnels. Dans la deuxième partie, nous traitons de l'analyse des propriétés de commandabilit é et d'observabilité des modèles LB obtenus. La première analyse est faite sur les critères algébriques de Kalmann et permet d'établir la non conservation des propriétés de commandabilité et d'observabilité lorsque l'ordre de réduction du système est augmenté. Une analyse plus approfondie basée sur la détermination les grammiens de commandabilit é et d'observabilité montre également que le constat reste valide pour les méthodes de discrétisation classique. La résolution des grammiens est faite avec des méthodes particulièrement adaptées aux structures creuses et de grande dimension que sont les matrices de la dynamique, de commande et/ou d'observation des modèles LB. Enfin, nous établissons que pour une commande aux frontières classique des canaux d'irrigation en débit et hauteur, la famille de systèmes des modèles LB d'ordre réduit n'est pas uniformément commandable alors qu'avec l'utilisation des variables de scattering comme variables de commande, cette famille devient uniformément commandable.
Book Synopsis Modélisation d'écoulements à surface libre avec fronts mobiles par éléments finis by : Bainian Zhang
Download or read book Modélisation d'écoulements à surface libre avec fronts mobiles par éléments finis written by Bainian Zhang and published by . This book was released on 1992 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: LA METHODE DES ELEMENTS FINIS A CONNU DEPUIS QUELQUES DIZAINES D'ANNEES UN ESSOR REMARQUABLE A CAUSE DE L'ACCROISSEMENT DE LA CAPACITE DES ORDINATEURS. TOUT D'ABORD CONFINEE A LA MECANIQUE DES STRUCTURES, LA METHODE DES ELEMENTS FINIS A ETE APPLIQUEE AVEC SUCCES A LA MECANIQUE DES FLUIDES ET PLUS PARTICULIEREMENT A L'HYDRODYNAMIQUE OU ELLE TROUVE UN TERRAIN D'APPLICATION REMARQUABLE A CAUSE DE LA DESCRIPTION DU MILIEU PHYSIQUE AUX FRONTIERES ET A LA BATHYMETRIE SOUVENT COMPLEXES. LE PRESENT TRAVAIL S'INSCRIT DANS CETTE PERSPECTIVE ET PRESENTE TOUT D'ABORD LES MODELES GENERAUX TRIDIMENSIONNELS DE TYPE NAVIER-STOKES AINSI QUE LA DERIVATION DES MODELES BIDIMENSIONNELS HORIZONTAUX ASSOCIES DE TYPE SAINT-VENANT. POUR CE DERNIER SYSTEME D'EQUATIONS INSTATIONNAIRES, NON LINEAIRES, PLUSIEURS METHODES DE RESOLUTION ONT ETE EXAMINEES, MISES EN UVRE ET TESTEES. EN ASSOCIATION AVEC CES STRATEGIES DE RESOLUTION, UNE SERIE D'ELEMENTS TRIANGULAIRES TRES SIMPLES A ETE TESTEE POUR SELECTIONNER LES ELEMENTS LES PLUS INTERESSANTS POUR UNE MISE EN UVRE OPTIMALE DANS LE CONTEXTE DE LA METHODE DES ELEMENTS FINIS. UNE SERIE D'EXEMPLES STATIONNAIRES ET INSTATIONNAIRES PERMET DE PRESENTER LEURS PERFORMANCES ET LEUR APPLICABILITE DANS UNE UTILISATION CONCRETE; L'ETUDE DE LA PROPAGATION DE LA MAREE DANS LA MANCHE FOURNIT, A CET EGARD, UNE BONNE ILLUSTRATION. ENFIN, LA MODELISATION DE LA PROPAGATION DES ECOULEMENTS DANS DES DOMAINES AVEC FRONTIERE MOBILE A ETE DUMENT ETUDIEE. CERTAINS ASPECTS AUSSI BIEN PHYSIQUES QUE MATHEMATIQUES DU PHENOMENE SONT RAPPELES. UNE DEMARCHE ALGORITHMIQUE EST PROPOSEE, ET VALIDEE SUR DES CAS COMPORTEMENTAUX
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 African Doctorates in Mathematics by :
Download or read book African Doctorates in Mathematics written by and published by Lulu.com. This book was released on 2007 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents a catalogue of over 2000 doctoral theses by Africans in all fields of mathematics, including applied mathematics, mathematics education and history of mathematics. The introduction contains information about distribution by country, institutions, period, and by gender, about mathematical density, and mobility of mathematicians. Several appendices are included (female doctorate holders, doctorates in mathematics education, doctorates awarded by African universities to non-Africans, doctoral theses by non-Africans about mathematics in Africa, activities of African mathematicians at the service of their communities). Paulus Gerdes compiled the information in his capacity of Chairman of the African Mathematical Union Commission for the History of Mathematics in Africa (AMUCHMA). The book contains a preface by Mohamed Hassan, President of the African Academy of Sciences (AAS) and Executive Director of the Academy of Sciences for the Developing World (TWAS). (383 pp.)
Book Synopsis The Theory of Ionization of Gases by Collision by : Sir John Townsend
Download or read book The Theory of Ionization of Gases by Collision written by Sir John Townsend and published by . This book was released on 1910 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flow Sensing in Air and Water by : Horst Bleckmann
Download or read book Flow Sensing in Air and Water written by Horst Bleckmann and published by Springer Science & Business Media. This book was released on 2014-01-22 with total page 558 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, leading scientists in the fields of sensory biology, neuroscience, physics and engineering explore the basic operational principles and behavioral uses of flow sensing in animals and how they might be applied to engineering applications such as autonomous control of underwater or aerial vehicles. Although humans possess no flow-sensing abilities, countless aquatic (e.g. fish, cephalopods and seals), terrestrial (e.g. crickets and spiders) and aerial (e.g. bats) animals have flow sensing abilities that underlie remarkable behavioral feats. These include the ability to follow silent hydrodynamic trails long after the trailblazer has left the scene, to form hydrodynamic images of their environment in total darkness, and to swim or fly efficiently and effortlessly in the face of destabilizing currents and winds.
Download or read book Satellite Situation Report written by and published by . This book was released on 1978-06-30 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Turbulent Reactive Flows by : R. Borghi
Download or read book Turbulent Reactive Flows written by R. Borghi and published by Springer Science & Business Media. This book was released on 2013-03-08 with total page 958 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulent reactive flows are of common occurrance in combustion engineering, chemical reactor technology and various types of engines producing power and thrust utilizing chemical and nuclear fuels. Pollutant formation and dispersion in the atmospheric environment and in rivers, lakes and ocean also involve interactions between turbulence, chemical reactivity and heat and mass transfer processes. Considerable advances have occurred over the past twenty years in the understanding, analysis, measurement, prediction and control of turbulent reactive flows. Two main contributors to such advances are improvements in instrumentation and spectacular growth in computation: hardware, sciences and skills and data processing software, each leading to developments in others. Turbulence presents several features that are situation-specific. Both for that reason and a number of others, it is yet difficult to visualize a so-called solution of the turbulence problem or even a generalized approach to the problem. It appears that recognition of patterns and structures in turbulent flow and their study based on considerations of stability, interactions, chaos and fractal character may be opening up an avenue of research that may be leading to a generalized approach to classification and analysis and, possibly, prediction of specific processes in the flowfield. Predictions for engineering use, on the other hand, can be foreseen for sometime to come to depend upon modeling of selected features of turbulence at various levels of sophistication dictated by perceived need and available capability.
Book Synopsis Experimental Aerodynamics by : Stefano Discetti
Download or read book Experimental Aerodynamics written by Stefano Discetti and published by CRC Press. This book was released on 2017-03-16 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental Aerodynamics provides an up to date study of this key area of aeronautical engineering. The field has undergone significant evolution with the development of 3D techniques, data processing methods, and the conjugation of simultaneous measurements of multiple quantities. Written for undergraduate and graduate students in Aerospace Engineering, the text features chapters by leading experts, with a consistent structure, level, and pedagogical approach. Fundamentals of measurements and recent research developments are introduced, supported by numerous examples, illustrations, and problems. The text will also be of interest to those studying mechanical systems, such as wind turbines.
Book Synopsis Sampling in Combinatorial and Geometric Set Systems by : Nabil H. Mustafa
Download or read book Sampling in Combinatorial and Geometric Set Systems written by Nabil H. Mustafa and published by American Mathematical Society. This book was released on 2022-01-14 with total page 251 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the behavior of basic sampling techniques and intrinsic geometric attributes of data is an invaluable skill that is in high demand for both graduate students and researchers in mathematics, machine learning, and theoretical computer science. The last ten years have seen significant progress in this area, with many open problems having been resolved during this time. These include optimal lower bounds for epsilon-nets for many geometric set systems, the use of shallow-cell complexity to unify proofs, simpler and more efficient algorithms, and the use of epsilon-approximations for construction of coresets, to name a few. This book presents a thorough treatment of these probabilistic, combinatorial, and geometric methods, as well as their combinatorial and algorithmic applications. It also revisits classical results, but with new and more elegant proofs. While mathematical maturity will certainly help in appreciating the ideas presented here, only a basic familiarity with discrete mathematics, probability, and combinatorics is required to understand the material.
Download or read book Random Trees written by Michael Drmota and published by Springer Science & Business Media. This book was released on 2009-04-16 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this book is to provide a thorough introduction to various aspects of trees in random settings and a systematic treatment of the mathematical analysis techniques involved. It should serve as a reference book as well as a basis for future research.
Download or read book Space Debris written by Heiner Klinkrad and published by Springer Science & Business Media. This book was released on 2006-09-01 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: The future evolution of the debris environment will be forecast on the basis of traffic models and possible hazard mitigation practices. The text shows how large trackable objects will have re-entry pinpointed and predictions made on related risk assessment for possible ground impact. Models will also be described for meteoroids which are also a prevailing risk.
Book Synopsis Pressure and Temperature Sensitive Paints by : Tianshu Liu
Download or read book Pressure and Temperature Sensitive Paints written by Tianshu Liu and published by Springer Science & Business Media. This book was released on 2006-01-06 with total page 331 pages. Available in PDF, EPUB and Kindle. Book excerpt: Luminescent molecule sensors, called pressure-sensitive paint (PSP) and temperature-sensitive paint (TSP), measure factors essential for understanding the aerodynamic performance and heat transfer characteristics of flight vehicles. They provide a powerful tool for experimental aerodynamicists to obtain a deeper understanding of the rich physical phenomena in complex flows around a flight vehicle. This book helps the reader to understand the physics and chemistry and the capabilities of PSP and TSP. It provides an overview of the wide scope of applications and explains the system requirements for using these sensors. The book also includes an extensive table of properties of PTP and TSP. As such, it is a thorough and up-to-date coverage of the underlying physics and applications of luminescent molecules designed for global pressure and temperature mapping
Book Synopsis Analytic Combinatorics by : Philippe Flajolet
Download or read book Analytic Combinatorics written by Philippe Flajolet and published by Cambridge University Press. This book was released on 2009-01-15 with total page 825 pages. Available in PDF, EPUB and Kindle. Book excerpt: Analytic combinatorics aims to enable precise quantitative predictions of the properties of large combinatorial structures. The theory has emerged over recent decades as essential both for the analysis of algorithms and for the study of scientific models in many disciplines, including probability theory, statistical physics, computational biology, and information theory. With a careful combination of symbolic enumeration methods and complex analysis, drawing heavily on generating functions, results of sweeping generality emerge that can be applied in particular to fundamental structures such as permutations, sequences, strings, walks, paths, trees, graphs and maps. This account is the definitive treatment of the topic. The authors give full coverage of the underlying mathematics and a thorough treatment of both classical and modern applications of the theory. The text is complemented with exercises, examples, appendices and notes to aid understanding. The book can be used for an advanced undergraduate or a graduate course, or for self-study.
Book Synopsis Reacting Flows: Combustion and Chemical Reactors by : G. S. S. Ludford
Download or read book Reacting Flows: Combustion and Chemical Reactors written by G. S. S. Ludford and published by American Mathematical Soc.. This book was released on 1986 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: Represents the culmination of the Special Year '84-'85 in Reacting Flows held at Cornell University. This work focuses on both mathematical and computational questions in combustion and chemical reactors. It is suitable for researchers and graduate students in the theory of reacting flows.
