Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Direct Simulation Of Particle Laden Fluids
Download Direct Simulation Of Particle Laden Fluids full books in PDF, epub, and Kindle. Read online Direct Simulation Of Particle Laden Fluids ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Direct Simulation of Particle-laden Fluids by :
Download or read book Direct Simulation of Particle-laden Fluids written by and published by . This book was released on 2000 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Processes that involve particle-laden fluids are common in geomechanics and especially in the petroleum industry. Understanding the physics of these processes and the ability to predict their behavior requires the development of coupled fluid-flow and particle-motion computational methods. This paper outlines an accurate and robust coupled computational scheme using the lattice-Boltzmann method for fluid flow and the discrete-element method for solid particle motion. Results from several two-dimensional validation simulations are presented. Simulations reported include the sedimentation of an ellipse, a disc and two interacting discs in a closed column of fluid. The recently discovered phenomenon of drafting, kissing, and tumbling is fully reproduced in the two-disc simulation.
Book Synopsis IUTAM Symposium on Computational Approaches to Multiphase Flow by : S. Balachandar
Download or read book IUTAM Symposium on Computational Approaches to Multiphase Flow written by S. Balachandar and published by Springer Science & Business Media. This book was released on 2007-01-28 with total page 443 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book provides a broad overview of the full spectrum of state-of-the-art computational activities in multiphase flow as presented by top practitioners in the field. It starts with well-established approaches and builds up to newer methods. These methods are illustrated with applications to a broad spectrum of problems involving particle dispersion and deposition, turbulence modulation, environmental flows, fluidized beds, bubbly flows, and many others.
Book Synopsis Particle-Laden Flow by : Bernard Geurts
Download or read book Particle-Laden Flow written by Bernard Geurts and published by Springer Science & Business Media. This book was released on 2007-10-20 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains a selection of the papers that were presented at the EUROMECH colloquium on particle-laden flow held at the University of Twente in 2006. The multiscale nature of this challenging field motivated the calling of the colloquium and reflects the central importance that the dispersion of particles in a flow has in various geophysical and environmental problems. The spreading of aerosols and soot in the air, the growth and dispersion of plankton blooms in seas and oceans, or the transport of sediment in rivers, estuaries and coastal regions are striking examples.
Book Synopsis Modeling Approaches and Computational Methods for Particle-laden Turbulent Flows by : Shankar Subramaniam
Download or read book Modeling Approaches and Computational Methods for Particle-laden Turbulent Flows written by Shankar Subramaniam and published by Academic Press. This book was released on 2022-10-20 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modelling Approaches and Computational Methods for Particle-laden Turbulent Flows introduces the principal phenomena observed in applications where turbulence in particle-laden flow is encountered while also analyzing the main methods for analyzing numerically. The book takes a practical approach, providing advice on how to select and apply the correct model or tool by drawing on the latest research. Sections provide scales of particle-laden turbulence and the principal analytical frameworks and computational approaches used to simulate particles in turbulent flow. Each chapter opens with a section on fundamental concepts and theory before describing the applications of the modelling approach or numerical method. Featuring explanations of key concepts, definitions, and fundamental physics and equations, as well as recent research advances and detailed simulation methods, this book is the ideal starting point for students new to this subject, as well as an essential reference for experienced researchers. Provides a comprehensive introduction to the phenomena of particle laden turbulent flow Explains a wide range of numerical methods, including Eulerian-Eulerian, Eulerian-Lagrange, and volume-filtered computation Describes a wide range of innovative applications of these models
Book Synopsis Mean Value and Correlation Problems connected with the Motion of Small Particles suspended in a turbulent fluid by : Tchen Chan-Mou
Download or read book Mean Value and Correlation Problems connected with the Motion of Small Particles suspended in a turbulent fluid written by Tchen Chan-Mou and published by Springer. This book was released on 2013-11-21 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Computational Fluid Dynamics for the Petrochemical Process Industry by : R.V.A. Oliemans
Download or read book Computational Fluid Dynamics for the Petrochemical Process Industry written by R.V.A. Oliemans and published by Springer. This book was released on 2012-11-05 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second of the 1989 conferences in the Shell Conference Series, held from 10 to 12 December in the Netherlands and organized by Koninklijke/Shell-Laboratorium, Amsterdam, was on "Computational Fluid Dynamics for Petrochemical Process Equip ment". The objective was to generate a shared perspective on the subject with respect to its role in the design of equipment involving complex flows. The conference was attended by scientists from four Shell laboratories and experts from universities in the USA, France, Great Britain, Germany and The Netherlands. R. V. A. Oliemans, G. Ooms and T. M. M. Verheggen formed the organizing committee. Complexities in fluid flow may arise from equipment geometry and/or the fluids themselves, which can be mUlti-component, single-phase or multiphase. Pressure and temperature gradients and any reactivity of components in the flow stream can be additional factors. Four themes were addressed: turbulent reacting and non-reacting flow, dispersed multiphase flow, separated two-phase flow and fluid flow simulation tools. The capabilities and limitations of a sequence of turbulence flow models, from the relatively simple k-£ model to direct numerical simulation and large eddy turbulence flow models, were considered for a range of petrochemical process equipment. Flow stability aspects and the potential of cellular automata for the simulation of industrial flows also received attention. The papers published in this special issue of Applied Scientific Research provide a fair representation of the Computational Fluid Dynamics topics discussed in the context of their application to petrochemical process equipment.
Book Synopsis Direct Numerical Simulation of Particle-laden Turbulence in a Straight Square Duct by : Gaurav Sharma
Download or read book Direct Numerical Simulation of Particle-laden Turbulence in a Straight Square Duct written by Gaurav Sharma and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Particle-laden turbulent flow through a straight square duct at Re[subscript tau]= 300 is studied using direct numerical simulation (DNS) and Lagrangian particle tracking. A parallelized 3-D particle tracking direct numerical simulation code has been developed to perform the large-scale turbulent particle transport computations reported in this thesis. The DNS code is validated after demonstrating good agreement with the published DNS results for the same flow and Reynolds number. Lagrangian particle transport computations are carried out using a large ensemble of passive tracers and finite-inertia particles and the assumption of one-way fluid-particle coupling. Using four different types of initial particle distributions, Lagrangian particle dispersion, concentration and deposition are studied in the turbulent straight square duct. Particles are released in a uniform distribution on a cross-sectional plane at the duct inlet, released as particle pairs in the core region of the duct, distributed randomly in the domain or distributed uniformly in planes at certain heights above the walls. One- and two-particle dispersion statistics are computed and discussed for the low Reynolds number inhomogeneous turbulence present in a straight square duct. New detailed statistics on particle number concentration and deposition are also obtained and discussed.
Book Synopsis Numerical Analysis of Particle-laden Flows with the Finite Element Method by : Guillermo Casas González
Download or read book Numerical Analysis of Particle-laden Flows with the Finite Element Method written by Guillermo Casas González and published by . This book was released on 2019 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this work we study the numerical simulation of particle-laden fluids, with a focus on Newtonian fluids and spherical, rigid particles. We are thus dealing with a multi-phase (more precisely, a multi-component) problem, with two phases: the fluid (continuous phase) and the the particles (disperse phase). Our general strategy consists in using the discrete element method (DEM) to model the particles and the finite element method (FEM) to discretize the Navier-Stokes equations, which model the continuous phase. The interaction model between both phases is (must be) based on a multiscale concept, since the smallest scales resolved of the continuous phase are considered much bigger than the particles. In other words, the resolution of the numerical model for the particles is finer than that used for the fluid. Consequently, whether implicit or explicit, there must be a filtering or averaging operation involved in the interaction between both phases, where the details of their motions smaller than the smallest resolution scale of the fluid are soothed out, since the latter is the coarsest of the two different resolutions considered. The spatial discretization of the continuous phase is performed with the FEM, using equal-order spaces of shape functions for the velocity and for the pressure. It is a well-known fact that this type of combination involves the violation of the Ladyzenskaja-Babuška-Brezzi (LBB) condition, resulting in an unstable numerical method. Moreover, the presence of the convective term in Eulerian description of the flow also leads to numerical instabilities. Both effects are treated with the sub-grid scale stabilization methods here. About the disperse phase, the trajectory of each particle is calculated based both on the fluid-interaction forces and on the contact forces between them and the surrounding rigid boundaries. The differential equation that describes the motion of particles in between successive collisions, given the mean (averaged) far field and for particles much smaller than the smallest scales of the flow (the Kolmogorov scale in turbulence) is the Maxey-Riley equation (MRE). This equation is the subject of chapter 2. The objective of this theoretical study is to establish quantitative (up to order-of-magnitude accuracy) limits to its range of validity and to the relative importance of its various terms. The method employed is dimensional analysis, which is systematically applied to derive the 'first effects' of a series of phenomena that are neglected in the derivation of the MRE. Chapter 3 is dedicated to the numerical resolution of the MRE. Here we present improvements to the method of van Hinsberg et al. (2011) for the calculation of the history term and analyse the method thoroughly. We include several tests to show the efficiency and utility of the proposed approach. The MRE is directly applicable to flows where the particle-based Reynolds number is Re “ 1. But its relevance reaches further, as its structure is the basis for the majority of extensions that model the movement of suspended particles outside the range of validity of the MRE. Chapter 4 is markedly more applied than the two preceding ones. It treats various industrial flux types with particles where we employ several extensions of the MRE of the type mentioned above. In the first part of this chapter we review the most important of these extensions and study the process of derivative recovery, necessary to calculate several terms in the equation of motion. The tests examples considered include bubble trapping in 'T'-junction tubes, the simulation of drilling systems of the oil industry based on the bombardment of steel particles and fluidized beds. For the latter we use a discrete filtering-based coupling approach, that mirrors the continuous theory sketched above. This set of three chapters (2, 3, 4) is the core of the Thesis, which is completed with an introduction (chapter 1) and the conclusions (chapter 5).
Book Synopsis Direct Simulation of the Motion of Solid Particles in Viscoelastic Fluids by : Peter Yijian Huang
Download or read book Direct Simulation of the Motion of Solid Particles in Viscoelastic Fluids written by Peter Yijian Huang and published by . This book was released on 1997 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Particles in Wall-Bounded Turbulent Flows: Deposition, Re-Suspension and Agglomeration by : Jean-Pierre Minier
Download or read book Particles in Wall-Bounded Turbulent Flows: Deposition, Re-Suspension and Agglomeration written by Jean-Pierre Minier and published by Springer. This book was released on 2016-07-26 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book presents an up-to-date review of turbulent two-phase flows with the dispersed phase, with an emphasis on the dynamics in the near-wall region. New insights to the flow physics are provided by direct numerical simuation and by fine experimental techniques. Also included are models of particle dynamics in wall-bounded turbulent flows, and a description of particle surface interactions including muti-layer deposition and re-suspension.
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 Direct Numerical Simulation of Particle-fluid Flow by : Thinh Xuan Ho
Download or read book Direct Numerical Simulation of Particle-fluid Flow written by Thinh Xuan Ho and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Particulate Flows by : Donald A. Drew
Download or read book Particulate Flows written by Donald A. Drew and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: This IMA Volume in Mathematics and its Applications PARTICULATE FLOWS: PROCESSING AND RHEOLOGY is based on the proceedings of a very successful one-week workshop with the same title, which was an integral part of the 1995-1996 IMA program on "Mathematical Methods in Materials Science." We would like to thank Donald A. Drew, Daniel D. Joseph, and Stephen L. Passman for their excellent work as organizers of the meeting. We also take this opportunity to thank the National Science Foun dation (NSF), the Army Research Office (ARO) and the Office of Naval Research (ONR), whose financial support made the workshop possible. A vner Friedman Robert Gulliver v PREFACE The workshop on Particulate Flows: Processing and Rheology was held January 8-12, 1996 at the Institute for Mathematics and its Applications on the University of Minnesota Twin Cities campus as part of the 1995- 96 Program on Mathematical Methods in Materials Science. There were about forty participants, and some lively discussions, in spite of the fact that bad weather on the east coast kept some participants from attending, and caused scheduling changes throughout the workshop. Heterogeneous materials can behave strangely, even in simple flow sit uations. For example, a mixture of solid particles in a liquid can exhibit behavior that seems solid-like or fluid-like, and attempting to measure the "viscosity" of such a mixture leads to contradictions and "unrepeatable" experiments. Even so, such materials are commonly used in manufacturing and processing.
Book Synopsis Verifiable Point-particle Methods for Two-way Coupled Particle-laden Flows by : Jeremy Aaron Kolker Horwitz
Download or read book Verifiable Point-particle Methods for Two-way Coupled Particle-laden Flows written by Jeremy Aaron Kolker Horwitz and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This work is concerned with the computation of particle-laden flows, primarily in the dilute regime, using the point-particle approach. The point-particle method solves continuum transport equations for the fluid phase coupled to Lagrangian equations for each particle. The coupling is accomplished by modelled source terms (momentum, energy, mass) which function as surrogates for boundary conditions on particle surfaces. This dissertation begins by surveying some of the widely used source terms, especially drag models, and the conditions under which these drag models are applicable. The incorporation of a drag model in a numerical simulation in general requires knowledge of the undisturbed fluid velocity at the location of the particle, which is the fluid velocity the particle experiences at every point along its trajectory, in absence of the particle. Because this quantity is not directly available in coupled simulations of particle-fluid interaction, and because the undisturbed fluid velocity is difficult to interpret physically, most modellers neglect to model it and instead incorporate a disturbed fluid velocity at the particle location, which is found by interpolation of the fluid velocity to the particle location using standard interpolation schemes. In this dissertation, we will show that the difference between the disturbed and undisturbed fluid velocity can be large, that the difference scales with the ratio of the particle size to the grid spacing, and that estimating the undisturbed fluid velocity is necessary for successful verification of coupled point-particle methods. We develop a scheme motivated by Stokesian symmetries which estimates the undisturbed fluid velocity by correlating this quantity to an enhancement in fluid curvature created by point-particles. The scheme is found to well predict particle settling velocity at low and finite Reynolds numbers, while standard schemes used in literature greatly over predict particle settling velocity. By examining the total particle plus fluid energy equation, we find that accurate estimation of the undisturbed fluid velocity implies a correspondence principal--namely the correct prediction of dissipation rate consistent with the drag model chosen. We then explore the consequences of a verifiable point-particle method in forced and decaying homogeneous isotropic turbulence. In the former, the incorporation of the undisturbed fluid velocity prediction results in enhanced clustering of particles, especially at smaller separations compared with standard schemes. This is related to a broadening in acceleration probability density function when the undisturbed fluid velocity is used to calculate the drag force. In decaying turbulence, for several fluid and particle statistics, it is found that standard point-particle approaches do not converge with grid refinement, while incorporation of our proposed correction for the undisturbed fluid velocity can result in grid insensitive results for lower-order moments. Examination of higher order moments reveals grid dependence for all point-particle implementations which suggests that not all practical questions surrounding particle-laden flows are answerable with the point-particle method. In the next section, the point-particle method is directly compared against non-dimensionally identical simulations of resolved particles in decaying turbulence. We find that under certain conditions, specification of an appropriate drag model which accounts for finite particle Reynolds number and accurate computation of the undisturbed fluid velocity are necessary for successful validation of the point-particle method. Under these conditions, good agreement is found for both integral quantities such as fluid dissipation rate, but also in comparison of particle acceleration probability density functions. Interestingly, under the same conditions, it is found that using a less suitable drag model but where the undisturbed fluid velocity is accounted can yield better predictions of the point-particle method compared with when a more appropriate drag model is used without accounting for the undisturbed fluid velocity. Having spent a large portion of this work on examining momentum/energy coupling in the absence of heat transfer, we move toward the examination of problems where particles can move and exchange internal energy with the fluid. The heat transfer sources, analogous to the drag models discussed previously, depend on the undisturbed fluid temperature at the particle location. We develop a scheme to estimate the undisturbed temperature by correlating it to the measured disturbed curvature in the temperature field created by a point-particle. We then perform verification of the proposed procedure for a settling particle subject to radiation under low and finite heating conditions. The proposed correction for the undisturbed temperature, combined with the previous method for estimating the undisturbed fluid velocity, together significantly reduce the error in settling velocity and terminal temperature compared with standard point-particle schemes. Finally, we discuss some outstanding questions in particle-laden flows, and how the current methodologies presented can be extended. One such extension concerns calculation of undisturbed quantities on anisotropic grids which are often used in the neighborhood of walls. We outline a general approach to this problem using the method of discrete Green's functions.
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 Modeling of Gas-to-Particle Mass Transfer in Turbulent Flows by : Sean C. Garrick
Download or read book Modeling of Gas-to-Particle Mass Transfer in Turbulent Flows written by Sean C. Garrick and published by Springer. This book was released on 2017-06-29 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Brief focuses on the dispersion of high-porosity particles, their entrainment into the vapor-laden stream, and the condensation of vapor onto the particles. The authors begin with a simple/static problem, focusing on transport within the particle. They go on to consider the high-resolution simulation of particles in a turbulent flow and the time-dependent evolution of the fluid-particle fields. Finally, they examine the more computationally-affordable large-eddy simulation of gas-to-particle mass-transfer. The book ends with a summary and challenges as well as directions for the area.
Book Synopsis Numerical Modeling in Micromechanics via Particle Methods - 2004 by : Y. Shimizu
Download or read book Numerical Modeling in Micromechanics via Particle Methods - 2004 written by Y. Shimizu and published by CRC Press. This book was released on 2004-09-15 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: The variety of applications of PFC has continued to increase in the ten years since the first release of these programs. This volume contains a collection of fifty-two papers selected for presentation at the 2nd PFC Symposium, held 27-29 October 2004, in Kyoto, Japan. These contributions cover a wide range of engineering applications and theoretical developments using PFC, and discrete methods in general. Topics include applications in civil engineering, slope and wall stability, rock fracture, shear flows, geology and industrial engineering. New developments are also described for contact bond models, fluid coupling and model calibration. This proceedings volume illustrates the great variety of PFC applications in different engineering fields, and includes case-studies and general applications as well as research presentations.
