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Simulation Aux Grandes Echelles De Latomisation
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Book Synopsis Simulation aux grandes échelles de l'atomisation by : Jérémy Chesnel
Download or read book Simulation aux grandes échelles de l'atomisation written by Jérémy Chesnel and published by . This book was released on 2010 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'injection liquide est un processus important dans beaucoup d'applications industrielles et plus spécifiquement au sein des moteurs à combustion. Beaucoup de méthodes RANS (Reynolds Averaged Navier-Stokes) ont été développées, dans le cas de l'atomisation, aussi bien en utilisant le formalisme Lagrangien que Eulérien. Cependant, les simulations LES (Large Eddy Simulation) sont connues pour être plus précises et mieux représenter les phénomènes physiques dans le cas monophasique. Développer la LES pour le cas diphasique est donc naturellement une étape nécessaire à franchir. Cependant, la simulation de l'atomisation requiert un traitement spécial de l'interface. Deux cas limites sont traités dans la littérature : - L'interface peut être bien capturée par le maillage. À ces endroits la LES doit rejoindre les résultats de méthodes classiques utilisées en DNS comme les méthodes VOF ou level-set. Ceci est une approche nécessaire proche injecteur. - Le maillage ne permet plus de suivre fidèlement l'interface, lors de la création de plissements inférieurs à la taille d'une maille. Dans ce cas le calcul doit reproduire les résultats d'une LES considérant des structures et des gouttes inférieures à la taille de la maille. Cette approche est nécessaire loin de l'injecteur dans la zone dispersée. C'est dans ce cadre que le travail réalisé durant cette thèse s'articule : le développement d'un modèle LES d'atomisation capable de passer continument d'une méthode à l'autre. La mise en œuvre de ce modèle a permis d'obtenir des résultats dans une configuration proche de l'injection Diesel, qui sont alors comparés à une base de données DNS.
Book Synopsis Simulation multi-échelle de l'atomisation d'un jet liquide sous l'effet d'un écoulement gazeux transverse en présence d'une perturbation acoustique by : Swann Thuillet
Download or read book Simulation multi-échelle de l'atomisation d'un jet liquide sous l'effet d'un écoulement gazeux transverse en présence d'une perturbation acoustique written by Swann Thuillet and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: La réduction des émissions polluantes est actuellement un enjeu majeur au sein du secteur aéronautique. Parmi les solutions développées par les motoristes, la combustion en régime pauvre apparaît comme une technologie efficace pour réduire l'impact de la combustion sur l'environnement.Or, ce type de technologie favorise l'apparition d'instabilités de combustion issues d'un couplage thermo-acoustique. Des études expérimentales précédemment menées à l'ONERA ont mis en évidence l'importance de l'atomisation au sein d'un injecteur multipoint sur le phénomène d'instabilités de combustion. L'objectif de cette thèse est de mettre en place la méthodologie multi-échelle pour reproduire les phénomènes de couplage entre l'atomisation du jet liquide en présence d'un écoulement gazeux transverse (configuration simplifiée d'un point d'injection d'un injecteur multipoint) et d'une perturbation acoustique imposée, représentative de l'effet d'une instabilité de combustion. Ce type d'approche pourra, à terme, être utilisé pour la simulation instationnaire LES d'un système de combustion, et permettra de déterminer les temps caractéristiques de convection du carburant liquide pouvant affecter les phénomènes d'évaporation et de combustion, et donc l'apparition des instabilités de combustions. Afin de valider cette approche,les résultats issus des simulations sont systématiquement comparés aux observations expérimentales obtenues dans le cadre du projet SIGMA. Dans un premier temps, une simulation du jet liquide en présence d'un écoulement gazeux transverse est réalisée. Cette simulation a permis de valider l'approche multi-échelle : pour cela, les grandes échelles du jet, ainsi que les mécanismes d'atomisation reproduits par les simulations, sont analysés. Ensuite, l'influence d'une perturbation acoustique sur l'atomisation du jet liquide est étudiée. Les comportements instationnaires du jet et du spray issu de l'atomisation sont comparés aux résultats expérimentaux à l'aide des moyennes temporelles et des moyennes de phase.
Download or read book OpenFOAM® written by J. Miguel Nóbrega and published by Springer. This book was released on 2019-01-24 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains selected papers of the 11th OpenFOAM® Workshop that was held in Guimarães, Portugal, June 26 - 30, 2016. The 11th OpenFOAM® Workshop had more than 140 technical/scientific presentations and 30 courses, and was attended by circa 300 individuals, representing 180 institutions and 30 countries, from all continents. The OpenFOAM® Workshop provided a forum for researchers, industrial users, software developers, consultants and academics working with OpenFOAM® technology. The central part of the Workshop was the two-day conference, where presentations and posters on industrial applications and academic research were shown. OpenFOAM® (Open Source Field Operation and Manipulation) is a free, open source computational toolbox that has a larger user base across most areas of engineering and science, from both commercial and academic organizations. As a technology, OpenFOAM® provides an extensive range of features to solve anything from complex fluid flows involving chemical reactions, turbulence and heat transfer, to solid dynamics and electromagnetics, among several others. Additionally, the OpenFOAM technology offers complete freedom to customize and extend its functionalities.
Book Synopsis Modélisation et simulation de l'atomisation secondaire et de la vaporisation turbulente by : Emmanuel Bodèle
Download or read book Modélisation et simulation de l'atomisation secondaire et de la vaporisation turbulente written by Emmanuel Bodèle and published by . This book was released on 2004 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail se situant dans le cadre du Groupement de Recherche " Combustion dans les moteurs-fusées " unissant le CNES, le CNRS, l'ONERA et la SNECMA concerne l'étude de l'atomisation secondaire et de la vaporisation turbulente pour la combustion des brouillards. L'objectif principal de cette étude est de fournir des modèles fiables pour les codes de calcul, reproduisant fidèlement les processus élémentaires de la combustion cryogénique dans les moteurs-fusées. Ces modèles sont issus d'études expérimentales précédentes du LCSR, ayant permis d'établir des bases de données. Les calculs sont basés sur la simulation du banc d'essai MASCOTTE (Montage Autonome Simplifié pour la Cryocombustion dans l'Oxygène et Toutes Techniques Expérimentales) de l'ONERA. Les résultats montrent d'une part l'influence de l'atomisation sur la structure du brouillard et de la flamme. D'autre part, les simulations de la vaporisation turbulente mettent en évidence l'influence de la turbulence sur les propriétés des gouttes.
Book Synopsis Simulation numérique directe de l'atomisation primaire d'un jet liquide à haute vitesse by : Anthony Leboissetier
Download or read book Simulation numérique directe de l'atomisation primaire d'un jet liquide à haute vitesse written by Anthony Leboissetier and published by . This book was released on 2002 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flows and Chemical Reactions in Heterogeneous Mixtures by : Roger Prud'homme
Download or read book Flows and Chemical Reactions in Heterogeneous Mixtures written by Roger Prud'homme and published by John Wiley & Sons. This book was released on 2014-10-30 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book - a sequel of previous publications 'Flows and Chemical Reactions' and 'Chemical Reactions in Flows and Homogeneous Mixtures' - is devoted to flows with chemical reactions in heterogeneous environments. Heterogeneous media in this volume include interfaces and lines. They may be the site of radiation. Each type of flow is the subject of a chapter in this volume. We consider first, in Chapter 1, the question of the generation of environments biphasic individuals: dusty gas, mist, bubble flow. Chapter 2 is devoted to the study at the mesoscopic scale: particle-fluid exchange of momentum and heat with determination of the respective exchange coefficients. In Chapter 3, we establish simplified equations of macroscopic balance for mass, for the momentum and energy, in the case of particles of one size (monodisperse suspension). Radiative phenomena are presented in Chapter 5.
Book Synopsis Direct Numerical Simulations of Gas–Liquid Multiphase Flows by : Grétar Tryggvason
Download or read book Direct Numerical Simulations of Gas–Liquid Multiphase Flows written by Grétar Tryggvason and published by Cambridge University Press. This book was released on 2011-03-10 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accurately predicting the behaviour of multiphase flows is a problem of immense industrial and scientific interest. Modern computers can now study the dynamics in great detail and these simulations yield unprecedented insight. This book provides a comprehensive introduction to direct numerical simulations of multiphase flows for researchers and graduate students. After a brief overview of the context and history the authors review the governing equations. A particular emphasis is placed on the 'one-fluid' formulation where a single set of equations is used to describe the entire flow field and interface terms are included as singularity distributions. Several applications are discussed, showing how direct numerical simulations have helped researchers advance both our understanding and our ability to make predictions. The final chapter gives an overview of recent studies of flows with relatively complex physics, such as mass transfer and chemical reactions, solidification and boiling, and includes extensive references to current work.
Book Synopsis Hydrodynamic Instabilities by : François Charru
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.
Book Synopsis Computational Methods for Multiphase Flow by : Andrea Prosperetti
Download or read book Computational Methods for Multiphase Flow written by Andrea Prosperetti and published by Cambridge University Press. This book was released on 2009-06-25 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thanks to high-speed computers and advanced algorithms, the important field of modelling multiphase flows is an area of rapid growth. This one-stop account – now in paperback, with corrections from the first printing – is the ideal way to get to grips with this topic, which has significant applications in industry and nature. Each chapter is written by an acknowledged expert and includes extensive references to current research. All of the chapters are essentially independent and so the book can be used for a range of advanced courses and the self-study of specific topics. No other book covers so many topics related to multiphase flow, and it will therefore be warmly welcomed by researchers and graduate students of the subject across engineering, physics, and applied mathematics.
Book Synopsis Flows and Chemical Reactions in Heterogeneous Mixtures by : Roger Prud'homme
Download or read book Flows and Chemical Reactions in Heterogeneous Mixtures written by Roger Prud'homme and published by John Wiley & Sons. This book was released on 2014-12-03 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book - a sequel of previous publications 'Flows and Chemical Reactions' and 'Chemical Reactions in Flows and Homogeneous Mixtures' - is devoted to flows with chemical reactions in heterogeneous environments. Heterogeneous media in this volume include interfaces and lines. They may be the site of radiation. Each type of flow is the subject of a chapter in this volume. We consider first, in Chapter 1, the question of the generation of environments biphasic individuals: dusty gas, mist, bubble flow. Chapter 2 is devoted to the study at the mesoscopic scale: particle-fluid exchange of momentum and heat with determination of the respective exchange coefficients. In Chapter 3, we establish simplified equations of macroscopic balance for mass, for the momentum and energy, in the case of particles of one size (monodisperse suspension). Radiative phenomena are presented in Chapter 5.
Book Synopsis Geometric Level Set Methods in Imaging, Vision, and Graphics by : Stanley Osher
Download or read book Geometric Level Set Methods in Imaging, Vision, and Graphics written by Stanley Osher and published by Springer Science & Business Media. This book was released on 2007-05-08 with total page 523 pages. Available in PDF, EPUB and Kindle. Book excerpt: Here is, for the first time, a book that clearly explains and applies new level set methods to problems and applications in computer vision, graphics, and imaging. It is an essential compilation of survey chapters from the leading researchers in the field. The applications of the methods are emphasized.
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 Theory of Multicomponent Fluids by : Donald A. Drew
Download or read book Theory of Multicomponent Fluids written by Donald A. Drew and published by Springer Science & Business Media. This book was released on 2006-05-10 with total page 311 pages. Available in PDF, EPUB and Kindle. Book excerpt: An exposition of the derivation and use of equations of motion for two-phase flow. The approach taken derives the equations of motion using ensemble averaging, and compares them with those derived from control volume methods. Closure for dispersed flows is discussed, and some fundamental solutions are given. The work focuses on the fundamental aspects of two-phase flow, and is intended to give the reader a background for understanding the dynamics as well as a system of equations that can be used in predictions of the behavior of dispersed two-phase flows. The exposition in terms of ensemble averaging is new, and combining it with modern continuum mechanics concepts makes this book unique. Intended for engineering, mathematics and physics researchers and advanced graduate students working in the field.
Book Synopsis Fundamentals of Multiphase Flow by : Christopher E. Brennen
Download or read book Fundamentals of Multiphase Flow written by Christopher E. Brennen and published by Cambridge University Press. This book was released on 2005-04-18 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Publisher Description
Book Synopsis Discrete Mechanics by : Jean-Paul Caltagirone
Download or read book Discrete Mechanics written by Jean-Paul Caltagirone and published by John Wiley & Sons. This book was released on 2019-01-23 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: The discrete vision of mechanics is based on the founding ideas of Galileo and the principles of relativity and equivalence, which postulate the equality between gravitational mass and inertial mass. To these principles are added the Hodge–Helmholtz decomposition, the principle of accumulation of constraints and the hypothesis of the duality of physical actions. These principles make it possible to establish the equation of motion based on the conservation of acceleration considered as an absolute quantity in a local frame of reference, in the form of a sum of the gradient of the scalar potential and the curl of the vector potential. These potentials, which represent the constraints of compression and rotation, are updated from the discrete operators. Discrete Mechanics: Concepts and Applications shows that this equation of discrete motion is representative of the compressible or incompressible flows of viscous or perfect fluids, the state of stress in an elastic solid or complex fluid and the propagation of nonlinear waves.
Book Synopsis Urban Travel and Sustainable Development by :
Download or read book Urban Travel and Sustainable Development written by and published by . This book was released on 1995 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sharing Our Success written by David Bell and published by SAEE. This book was released on 2004 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: The disturbing educational success rates for Aboriginal students in comparison with their peers have been documented for many years. Reducing this persistent achievement gap is one of Canada's most pressing educational challenges. Numerous reports commissioned by federal and provincial governments and Aboriginal authorities have offered detailed examinations of the complex social, economic, linguistic, and cultural interrelationships that contextualize the educational environments of Aboriginal students. Many of their families struggle with the legacy of residential schools that ripped families apart and caused immeasurable damage to the social fabric. Schools serving these communities work within a context that may include poverty, learned helplessness, despair, and high levels of abuse, addictions and violence. For some communities, student suicide rates may exceed graduation rates. Yet despite many extraordinary challenges, some schools are producing tangible progress for their Aboriginal students. This report springs from a study of ten such schools in an effort to identify practices that appear to contribute to their success.
