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Numerical and granulometric approaches to geophysical granular flows (2003)

by S Dartevelle
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Animating sand as a fluid

by Yongning Zhu - ACM Trans. Graph. (Proc. SIGGRAPH , 2005
"... My thesis presents a physics-based simulation method for animating sand. To allow for efficiently scaling up to large volumes of sand, we abstract away the individual grains and think of the sand as a continuum. In particular we show that an existing water simulator can be turned into a sand simulat ..."
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My thesis presents a physics-based simulation method for animating sand. To allow for efficiently scaling up to large volumes of sand, we abstract away the individual grains and think of the sand as a continuum. In particular we show that an existing water simulator can be turned into a sand simulator within frictional regime with only a few small additions to account for inter-grain and boundary friction, yet with visually acceptable result. We also propose an alternative method for simulating fluids. Our core representation is a cloud of particles, which allows for accurate and flexible surface tracking and advection, but we use an auxiliary grid to efficiently enforce boundary conditions and incompressibility. We further address the issue of reconstructing a surface from particle data to render each frame. ii Contents ii
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...mic equations are derived with constitutive equations for the density, velocity and granular temperature.[19] Another mechanism, kineticcollisional stress has been introduced for the constitutive law.=-=[9]-=- When the granular flow is moving slowly, i.e. with low rate-of-strain and high concentration, it is called frictional regime, since frictional stress dominates in the interaction of grains. The flow ...

Saskatoon By

by John Zhen, Guo Ma
"... uate degree from the University of Saskatchewan, I agree that the Libraries of this University may make it freely available for inspection. I further agree that permission for copying of this thesis in any manner, in whole or in part, for scholarly purposes may be granted by the professor or profess ..."
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uate degree from the University of Saskatchewan, I agree that the Libraries of this University may make it freely available for inspection. I further agree that permission for copying of this thesis in any manner, in whole or in part, for scholarly purposes may be granted by the professor or professors who supervised my thesis work or, in their absence, by the Head of the Department or the Dean of the College in which my thesis work was done. It is understood that any copying or publication or use of this thesis or parts thereof for financial gain shall not be allowed without my written permission. It is also understood that due recognition shall be given to me and to the University of Saskatchewan in any scholarly use which may be made of any material in my thesis.

Session: TWD30 Selected Topics in Fluid-Particle Systems Experiences with the open source model for disseminating information in computational gas-solids flow

by M. Syamlal, T. J. O’brien, U. S. Doe, S. Benyahia, Fluent Inc
"... National Energy Technology Laboratory (NETL) has been developing advanced gassolids flow models and promoting their use in the design of multiphase flow reactors encountered in fossil energy processes for over two decades. In addition to the successful use of the models to help with the design of fo ..."
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National Energy Technology Laboratory (NETL) has been developing advanced gassolids flow models and promoting their use in the design of multiphase flow reactors encountered in fossil energy processes for over two decades. In addition to the successful use of the models to help with the design of fossil energy systems such as gasifiers, this research resulted in a general purpose gas-solids computational fluid dynamics code called MFIX. In 2001, MFIX was made open source (http://www.mfix.org). Since then over 750 researchers from 250 research institutions world-wide have downloaded the code, of which a recent survey has shown that at least 10 % have become regular users of the code. Nearly 50 % of the respondents, who have been using the code for several years, indicated significant success in their research with MFIX. Over 40 % of these users are graduate students, and the code has been used to complete several masters and Ph.D. theses. The enhancements to the code resulting from the academic research have migrated into the main code repository, the quality of which is ensured with extensive testing conducted periodically. The “open source model ” provides a new method for code
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...tor of 48 [29, 30]. Results compared with experimental data demonstrated the effect of particle rotation on bubble dynamics [31, 32]. No results to report yet. PhD Thesis, research papers and reports =-=[33, 34, 35, 36, 37]-=-. A series of 2D and 3D MFIX models were initially used. Current models, solved using Fluent®, have helped to identify several important design concerns. Proposed and tested modifications for solving ...

Original paper

by Nicholas Christakis, Pierre Chapelle, Nadezhda Strusevich, Ian Bridle, John Baxter, Mayur K. Patel, Mark Cross, Ugur Tüzün, Alan R. Reed, Michael S. A. Bradley , 2005
"... Also available online- www.brill.nl/apt ..."
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Also available online- www.brill.nl/apt
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...qual to the angle of internal friction. This can be directly derived through the Coulomb equation, which relates the shear strength to the effective normal stress for unconsolidated granular material =-=[15]-=-. Hence, either angle may be used to describe the angle of the slope of a granular heap. 2.3. Numerical method The full set of equations of the mathematical model was solved numerically with the aid o...

For Lateral Loading

by T. P. T. Dao , 2011
"... university. Although this thesis is in principal an individual project, I would not have been able to complete this thesis without the “external ” support of a number of people whom I like to thank here. First of all, I am profoundly indebted to Dr. Ir. Ronald Brinkgreve who provided sincere guidanc ..."
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university. Although this thesis is in principal an individual project, I would not have been able to complete this thesis without the “external ” support of a number of people whom I like to thank here. First of all, I am profoundly indebted to Dr. Ir. Ronald Brinkgreve who provided sincere guidance, advice, criticism and encouragement in every stage of my research process. In addition to his dedicated supervision, his critical reading and suggestions helped me to improve the coherence between contributing parts of the report as well as the quality of the report. I would like to express my grateful gratitude and sincere thanks to Prof. Ir. A.F. van Tol, Dr. Ir. K.J. Bakker, Ing. H.J. Everts and Ir. F.A.J.M Mathijssen, who have invested a lot of time for valuable comments and simulating discussions. I really enjoyed their friendly supervision. I would like to thank Plaxis bv for offering me the opportunity to join in professional and pleasant working environment. A word of special thanks goes to Dr. Ir. Paul Bonnier and to all colleagues at Plaxis bv for their warm and continuous help. My two-year study was financially supported by Can Tho 150 Project under Vietnamese government fund. This support is gratefully acknowledged.
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