Download or read book Couplage SPH DEM pour l tude de l rosion dans les ouvrages hydrauliques written by Jessica Sjah and published by . This book was released on 2013 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: L’érosion est un phénomène d’arrachage et de transport de particules solides par des efforts hydrauliques au sein des ouvrages hydrauliques. Cette pathologie très représentée dans les ouvrages en terre peut conduire à la rupture, aussi, la comprendre et la maîtriser constituent des enjeux sociétaux et industriels très forts. L’érodabilité des matériaux se caractérise au travers notamment d’un essai dit d’érosion de conduit et sa modélisation numérique constitue le pivot de ce travail de thèse. Le phénomène d’érosion est un problème couplé entre le fluide et le solide et nous utiliserons deux codes construits sur des approches particulaires pour aborder le problème : ASPHODEL (ANDRITZLMFA) pour la partie fluide (méthode SPH-ALE Smoothed Particle Hydrodynamics – Arbitrary Lagrangian Eulerian) et YADE (L3S-R) pour la fraction solide (méthode DEM Discrete Element Method). Alors que YADE a été largement utilisé pour modéliser des problèmes géotechniques, ASPHODEL n’a pas encore été évalué dans un tel contexte. Ce travail constituera alors une étude de faisabilité pour l’utilisation d’ASPHODEL dans un contexte du génie civil et donnera les conditions pour espérer obtenir des résultats quantitatifs pour les phénomènes étudiés. Dans un deuxième temps, le couplage entre les deux codes sera construit dans le but d’étudier les phénomènes d’arrachage de particules le long de conduits formés à travers des matériaux granulaires cohérents. La validation du code ASPHODEL à l’échelle de la particule a été effectuée par l’étude de l’écoulement visqueux autour d’un objet 2D (cylindre) fixe et isolé de section circulaire mais aussi carrée ou triangulaire. Les forces de trainée, de portance, le coefficient de pression autour du cylindre et le nombre de Strouhal sont comparés à des résultats issus de la littérature pour différents Reynolds en régime laminaire. La validation du code ASPHODEL à l’échelle de l’échantillon a consisté à étudier un écoulement fluide entre des parois lisses ainsi que des parois constituées de particules solides fixes créant une rugosité. Le coefficient de frottement a été systématiquement calculé et comparé aux résultats issus de la littérature et le torseur fluide sur chaque particule solide des parois a été aussi évalué. Enfin, le couplage partitionné entre les deux codes fluide et solide a été construit et validé qualitativement pour le problème de la sédimentation sous gravité d’un grain solide rigide dans un fluide visqueux.

Download or read book Mechanical Engineering Technologies and Applications Volume 3 written by Zied Driss and published by Bentham Science Publishers. This book was released on 2023-12-28 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on cases and studies of interest to mechanical engineers and industrial technicians. The considered applications in this volume are widely used in several industrial fields particularly in the automotive and aviation industries. Readers will understand the theory and techniques which are used in each application covered in each chapter. Volume 3 includes the following topics: Numerical simulations of three-dimensional laminar mixed convection heat transfer of water-based-Al2O3 nanofluid in an open cubic cavity with a heated block. Nonlinear formulations of Element-Free Galerkin Method (EFGM) for large deformation analysis of Ogden’s hyperelastic materials, emphasizing incompressibility and mesh distortion avoidance. Development of a 3D numerical model with LS-DYNA using a coupled SPH-FEM method to simulate hydraulic behavior of a Ski-Jump Spillway with dentates, showcasing precision through validation. Exploration of enhancing the inlet system of an LPG-H2 fueled engine using a static inclined blade turbine, analyzed through Computational Fluid Dynamics (CFD) simulations. Effective utilization of Artificial Neural Networks (ANN) in heat transfer applications, addressing issues like fouling in heat exchangers, showcasing their accuracy compared to experimental data. Investigation of the impact of nitrogen concentration on the structure and properties of ZrN coatings deposited by magnetron sputtering, evaluating variations in structural and mechanical properties. Forced convection in a horizontal cylindrical pipe with pseudoplastic fluid, considering uniform constant heat flux and uniform temperature as boundary conditions. Modeling and experimental study of a water solar collector coupled to an optimized solar still, aiming to enhance freshwater production in a solar distillation system under specific climatic conditions. Exploration of the effect of film thickness on the structure and properties of Ti-N films deposited by magnetron sputtering, utilizing theoretical and experimental analysis to confirm the rock salt TiN structure. The presented case studies and development approaches aim to provide readers with basic and applied information broadly related to mechanical engineering and technology. Readership Graduate students, PhD candidates and professionals seeking basic and applied information related to mechanical engineering and technology.

Download or read book Etude exp rimentale de l rosion de sols homog nes et h t rog nes written by Tarek Karoui and published by . This book was released on 2014 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: L’érosion interne est l’une des principales causes d'instabilité des ouvrages de retenue hydrauliques tels que les digues, les levées et les barrages. Cette pathologie peut mener à la ruine de l’ouvrage avec des pertes humaines et d’importants dégâts matériels. Ce travail de thèse est consacré à la caractérisation de la suffusion dans les sols homogènes et hétérogènes, et participe aux études menées dans le cadre du projet national ERINOH (ERosion INterne des Ouvrages Hydrauliques). Les essais menés sur l’EFA ont été effectués sur des échantillons homogènes constitués de sables et de fines (Kaolinite, Illite ou Silt) reconstitués au laboratoire. Les résultats ont montré l’importance du type et du pourcentage des fines sur la résistance à l’érosion. Par la suite, les résultats de ces essais ont été comparés aux résultats obtenus avec les mêmes matériaux réalisés à l’IFFSTAR (Paris) avec le dispositif d’érosion de trou HET. Les résultats des classifications selon les deux dispositifs placent chaque matériau testé dans des catégories similaires. Les deux approches expérimentales (EFA et HET) peuvent donc être complémentaires pour la classification des sols vis-à-vis de l’érosion interne. L’utilisation de l’EFA se révèle être plus appropriée pour des sols à faible proportion de fines qui ne peuvent pas être testés au HET. Les essais réalisés en colonne ont été effectués sur deux types de matériaux : des sols homogènes et des sols hétérogènes. Les essais sur sols homogènes ont été menés sur des matériaux constitués de sables et de fines (Argiles et Limon) à différentes proportions. Les essais ont montré également l’influence du type et du pourcentage de fines sur l’initiation et la cinétique de l’érosion. Quant aux essais sur sols hétérogènes, ils sont répartis en trois catégories : les essais sur sol bi-couches, les essais sur sol ségrégé et les essais sur sol naturel. Les essais sur sol bi-couhes ont servi à montrer l’influence sur la suffusion d’une hétérogénéité géométrique créée par une discontinuité granulométrique sur l’érosion. Ces essais ont montré aussi qu’un sol ségrégé pouvait dans certaines conditions être légèrement plus résistant à l’érosion. Dans ces essais, l’étude de l’évolution de la perméabilité en cours d’essai et l'analyse granulométrique après essai montrent une redistribution granulaire au sein de l’échantillon, qui peut mener à une meilleure résistance à la suffusion. Les essais sur le sol naturel (graves du Rhin) ont montré que ce dernier présente une résistance à la suffusion sous les sollicitations hydrauliques, en raison de la propriété d’auto-filtration. Les mesures de pressions le long de l’échantillon ont permis de mettre en évidence la variation des gradients hydrauliques locaux, paramètres indirects de redistribution de fines dans l’échantillon avec un colmatage potentiel.

Download or read book Etude multi chelle de l rosion de contact au sein des ouvrages hydrauliques en terre written by Rémi Beguin and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'érosion de contact est un type d'érosion interne qui se développe à l'interface entre deux couches de matériaux de granulométries différentes. Les particules d'un sol fin (sable, limon, argile...) sont détachées par l'écoulement et entraînées à travers les pores du sol grossier au contact (gravier...). Bien que l'on suspecte sa présence dans de nombreux ouvrages, ce processus d'érosion a été peu étudié jusqu'à présent. Aussi ce travail de thèse s'est attaché à mieux le comprendre pour parvenir à le modéliser. A l'échelle du pore, l'écoulement à l'interface entre deux milieux poreux a été caractérisé, grâce à un dispositif expérimental développé au Cemagref d'Aix-en-Provence qui combine fluorescence induite par laser, méthode PIV et milieu iso-indice. L'importance de la variabilité des sollicitations hydrauliques a ainsi été soulignée. A l'échelle de l'échantillon, des essais sur sols réels et sols reconstitués ont été menés au LTHE, afin d'identifier les phénomènes en jeu. Ont également été obtenues sur ce dispositif des mesures du taux d'érosion en fonction de l'intensité de l'écoulement, pour différents types de sols fins et de sols grossiers. Une modélisation stochastique de ces essais a ensuite été proposée. Enfin, des essais à grande échelle ont été conduits au laboratoire de la Compagnie Nationale du Rhône pour étudier l'éventuelle influence d'effets d'échelle ainsi que les conséquences de cette érosion de contact sur le comportement global et l'intégrité d'un ouvrage. Il a ainsi été mis en évidence la possibilité qu'une érosion de conduit soit initiée par érosion de contact. Cette thèse a été réalisée dans le cadre du projet ERINOH (ERosion INterne dans les Ouvrages Hydrauliques), en convention CIFRE avec le Centre d'Ingénierie Hydraulique d'EDF.

Download or read book An Introduction to Fluid Mechanics and Transport Phenomena written by G. Hauke and published by Springer Science & Business Media. This book was released on 2008-08-26 with total page 301 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the foundations of fluid mechanics and transport phenomena in a concise way. It is suitable as an introduction to the subject as it contains many examples, proposed problems and a chapter for self-evaluation.

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 Hydrology of Mediterranean and Semiarid Regions written by Eric Servat and published by . This book was released on 2003 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mechanics of Porous Media written by Philippe Charlez and published by CRC Press. This book was released on 1995-01-01 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work presents the lecture notes of the 1994 Mechanics of Porous Media Summer School. Chapters cover theoretical basics, methods for measuring poroelastic coefficients, numerical implementation and applications.

Download or read book Advances in Hydroinformatics written by Philippe Gourbesville and published by Springer. This book was released on 2015-08-21 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a collection of extended papers based on presentations given during the SIMHYDRO 2014 conference, held in Sophia Antipolis in June 2014. It focuses on the modeling and simulation of fast hydraulic transients, on 3D modeling, and on uncertainties and multiphase flows. The book explores both the limitations and performance of current models and presents the latest developments based on new numerical schemes, high-performance computing, multiphysics and multiscale methods, and better interaction with field or scale model data. It addresses the interests of practitioners, stakeholders, researchers and engineers active in this field.

Download or read book Advanced Transport Phenomena written by L. Gary Leal and published by Cambridge University Press. This book was released on 2007-06-18 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced Transport Phenomena is ideal as a graduate textbook. It contains a detailed discussion of modern analytic methods for the solution of fluid mechanics and heat and mass transfer problems, focusing on approximations based on scaling and asymptotic methods, beginning with the derivation of basic equations and boundary conditions and concluding with linear stability theory. Also covered are unidirectional flows, lubrication and thin-film theory, creeping flows, boundary layer theory, and convective heat and mass transport at high and low Reynolds numbers. The emphasis is on basic physics, scaling and nondimensionalization, and approximations that can be used to obtain solutions that are due either to geometric simplifications, or large or small values of dimensionless parameters. The author emphasizes setting up problems and extracting as much information as possible short of obtaining detailed solutions of differential equations. The book also focuses on the solutions of representative problems. This reflects the book's goal of teaching readers to think about the solution of transport problems.

Download or read book Transport Phenomena in Multiphase Systems written by Amir Faghri and published by Academic Press. This book was released on 2006 with total page 1072 pages. Available in PDF, EPUB and Kindle. Book excerpt: Engineering students in a wide variety of engineering disciplines from mechanical and chemical to biomedical and materials engineering must master the principles of transport phenomena as an essential tool in analyzing and designing any system or systems wherein momentum, heat and mass are transferred. This textbook was developed to address that need, with a clear presentation of the fundamentals, ample problem sets to reinforce that knowledge, and tangible examples of how this knowledge is put to use in engineering design. Professional engineers, too, will find this book invaluable as reference for everything from heat exchanger design to chemical processing system design and more. * Develops an understanding of the thermal and physical behavior of multiphase systems with phase change, including microscale and porosity, for practical applications in heat transfer, bioengineering, materials science, nuclear engineering, environmental engineering, process engineering, biotechnology and nanotechnology * Brings all three forms of phase change, i.e., liquid vapor, solid liquid and solid vapor, into one volume and describes them from one perspective in the context of fundamental treatment * Presents the generalized integral and differential transport phenomena equations for multi-component multiphase systems in local instance as well as averaging formulations. The molecular approach is also discussed with the connection between microscopic and molecular approaches * Presents basic principles of analyzing transport phenomena in multiphase systems with emphasis on melting, solidification, sublimation, vapor deposition, condensation, evaporation, boiling and two-phase flow heat transfer at the micro and macro levels * Solid/liquid/vapor interfacial phenomena, including the concepts of surface tension, wetting phenomena, disjoining pressure, contact angle, thin films and capillary phenomena, including interfacial balances for mass, species, momentum, and energy for multi-component and multiphase interfaces are discussed * Ample examples and end-of-chapter problems, with Solutions Manual and PowerPoint presentation available to the instructors

Download or read book Advanced Transport Phenomena written by John C. Slattery and published by Cambridge University Press. This book was released on 1999-07-13 with total page 735 pages. Available in PDF, EPUB and Kindle. Book excerpt: The term 'transport phenomena' describes the fundamental processes of momentum, energy, and mass transfer. This text provides a thorough discussion of transport phenomena, laying the foundation for understanding a wide variety of operations used by chemical engineers. The book is arranged in three parallel parts covering the major topics of momentum, energy, and mass transfer. Each part begins with the theory, followed by illustrations of the way the theory can be used to obtain fairly complete solutions, and concludes with the four most common types of averaging used to obtain approximate solutions. A broad range of technologically important examples, as well as numerous exercises, are provided throughout the text. Based on the author's extensive teaching experience, a suggested lecture outline is also included. This book is intended for first-year graduate engineering students; it will be an equally useful reference for researchers in this field.

Download or read book The Hydrology of the Nile written by John V. Sutcliffe and published by . This book was released on 1999 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Its scope can be seen from the list of contents overleaf.

Download or read book Fundamentals of Heat and Mass Transfer written by T. L. Bergman and published by John Wiley & Sons. This book was released on 2011-04-12 with total page 2249 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fundamentals of Heat and Mass Transfer, 7th Edition is the gold standard of heat transfer pedagogy for more than 30 years, with a commitment to continuous improvement by four authors having more than 150 years of combined experience in heat transfer education, research and practice. Using a rigorous and systematic problem-solving methodology pioneered by this text, it is abundantly filled with examples and problems that reveal the richness and beauty of the discipline. This edition maintains its foundation in the four central learning objectives for students and also makes heat and mass transfer more approachable with an additional emphasis on the fundamental concepts, as well as highlighting the relevance of those ideas with exciting applications to the most critical issues of today and the coming decades: energy and the environment. An updated version of Interactive Heat Transfer (IHT) software makes it even easier to efficiently and accurately solve problems.

Download or read book FUNDAMENTALS OF HEAT AND MASS TRANSFER written by B. K. VENKANNA and published by PHI Learning Pvt. Ltd.. This book was released on 2010-01-01 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This comprehensive text on the basics of heat and mass transfer provides a well-balanced treatment of theory and mathematical and empirical methods used for solving a variety of engineering problems. The book helps students develop an intuitive and practical under-standing of the processes by emphasizing the underlying physical phenomena involved. Focusing on the requirement to clearly explain the essential fundamentals and impart the art of problem-solving, the text is written to meet the needs of undergraduate students in mechanical engineering, production engineering, industrial engineering, auto-mobile engineering, aeronautical engineering, chemical engineering, and biotechnology.

Download or read book The Hydrology geomorphology Interface written by Marwan A. Hassan and published by IAHS Press. This book was released on 2000 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Transport Phenomena in Micro Process Engineering written by Norbert Kockmann and published by Springer Science & Business Media. This book was released on 2007-11-12 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, the fundamentals of chemical engineering are presented with respect to applications in micro system technology, microfluidics, and transport processes within microstructures. Special features of the book include the state-of-the-art in micro process engineering, a detailed treatment of transport phenomena for engineers, and a design methodology from transport effects to economic considerations.