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Book Computation of Three Dimensional Complex Flows

Download or read book Computation of Three Dimensional Complex Flows written by Michel Deville and published by Springer Science & Business Media. This book was released on 1996-07 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: The IMACS-COST conference on "Computational Fluid Dynamics, Three-Dimensional Complex Flows" was held in Lausanne, Switzerland, September 13 - 15, 1995. The scien tific sponsors of the conference were • IMACS: International Association for Mathematics and Computers in Simulation, • COST: European Cooperation in the field of Scientific and Technical Research, • ERCOFTAC: European Research Community on Flow, Turbulence and Combus tion. The scientific interests of the IMACS and ERCOFTAC associations are closely related to computational fluid dynamics whereas the European Union programme COST covers a wider range of scientific subjects. The COST' Action F1' launched in 1992 by Professor I. L. Ryhming deals with "Complex three-dimensional viscous flows: prediction, modelling, manipulation and control". It has several subtopics among which numerical methods and modelling issues are the main areas of research and development. The meeting gathered together eighty-seven scientists, engineers and researchers from sev enteen countries: Belgium, Finland, France, Germany, Greece, Hong Kong, Israel, Italy, Japan, the Netherlands, Norway, Russia, Spain, Sweden, Switzerland, United Kingdom, United States of America. All major numerical approximation methods were discussed: finite differences, finite volumes, finite elements, spectral methods. The topics covered by the sixty communications spanned the full spectrum of computational fluid dynam ics: direct numerical simulation, large-eddy simulation, turbulence modelling, free surface flows, non Newtonian fluids, thermal convection, etc.

Book Simulations of Two phase Flows Using Interfacial Area Transport Equation

Download or read book Simulations of Two phase Flows Using Interfacial Area Transport Equation written by Xia Wang and published by . This book was released on 2010 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The current study focuses on providing a reliable computational fluid dynamics (CFD) tool for two-phase flow simulations, which is capable of capturing dynamic changes of interfacial structures and achieving accurate predictions of flow behaviors. A set of interfacial area transport equations (IATEs), which dynamically evaluates the interfacial area concentration, was successfully implemented into a CFD software package, namely, Fluent. The interfacial area concentration is a key parameter in modeling the interfacial transfer terms in the two-fluid model due to mechanical and thermal non-equilibrium between the two phases. Given the various flow regimes in two-phase flows, one-group IATE and two-group IATE developed in the literature were separately incorporated into the two-fluid model and subsequently validated under different flow conditions: liquid-liquid two-component bubbly; air-water bubbly, cap-bubbly, and churn-turbulent flows. Numerical results obtained from the two-fluid model incorporated with the IATE models were generally in good agreement with the experimental data. A set of adjustable model coefficients was also established for three-dimensional simulations when the influence of the lateral phase distribution in a circular flow channel on the one-group IATE model was considered. In addition, contributions of the bubble interaction mechanisms and interfacial forces to the phase distributions of two-phase flow were numerically investigated. It was observed that the lift force was significant for the phase distributions in gas-liquid two-phase flows; however it might cause convergence issues when large bubbles exist in the flow field of interest. Furthermore, a mathematical property, i.e., the well-posedness of the proposed one-dimensional three-field model with the two-group IATE model, was studied. The necessary condition to ensure well-posedness was obtained using characteristic analysis. The momentum flux parameters were introduced to help stabilize the proposed model.

Book A Three dimensional Computational Fluid Dynamics Model for Flow Through Porous Media

Download or read book A Three dimensional Computational Fluid Dynamics Model for Flow Through Porous Media written by Chris Kiser and published by . This book was released on 2011 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This thesis covers the development of a model for fluid flow which incorporates computational fluid dynamics simulations using three-dimensional planar porous media networks. Porous media are introduced along with applications and the need for computational models is discussed. Previous experiments and models are presented as well as features of the current model. This model constructs three-dimensional planar networks from cylindrical pipes and elbows of varying length, diameter, and angle. Simulations are carried out using a finite volume based computational fluid dynamics software. A methodology is provided to discuss the source code of the executable created to automate the modeling process. This process begins with the network creation from an existing code, which generates sets of random pore networks called 'realizations' and ends with linear and polynomial regressions used to provide curve fits for Darcy's law and Forchheimer's equation. Findings of these parameters are presented for varying porosity values of Berea sandstone simulated with single phase liquid water. Results show that the model follows Forchheimer's equation for certain porosities and follows experimental results. Finally, remarks on future work are given and a closing summary is presented."--Abstract.

Book Computational Fluid Dynamics Simulations of Phase Distribution in Adiabatic Upward Bubbly Flows Using Interfacial Area Transport Equation

Download or read book Computational Fluid Dynamics Simulations of Phase Distribution in Adiabatic Upward Bubbly Flows Using Interfacial Area Transport Equation written by Xia Wang and published by . This book was released on 2007 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: In analyzing gas-liquid two-phase flows, it is imperative to take into account the bubble-bubble and bubble-eddy interactions, which may result in bubble coalescence and/or disintegration. The bubble coalescence and disintegration will further affect the interfacial structure, which could, to a first-order approximation, be characterized by the interfacial area concentration and void fraction. In this thesis, a one-group interfacial area transport equation (IATE) that was developed in the literature to describe the evolution of the interfacial area concentration in bubbly flows was implemented into a computational fluid dynamics (CFD) code, namely, FLUENT. Previous studies demonstrated that the following three bubble interaction mechanisms were essential in bubby flows of interest: coalescence of bubbles due to bubble random collisions driven by turbulence, coalescence of bubbles due to wake entrainment, and disintegration of bubbles caused by turbulent eddy impact. These three mechanisms have been taken into account in the one-group IATE. The current study focuses on examining the capability of FLUENT with the one-group IATE in predicting the phase distribution in adiabatic bubbly flows. Eulerian multiphase model in FLUENT 6.2.16 is applied, in which two sets of conservation equations are applied to each phase separately but coupled through interfacial transfer terms. The constitutive relations of the interfacial transfers are provided using the interfacial area concentration described through the IATE. CFD simulations of adiabatic upward bubbly flows in a circular pipe have been carried out in this study. In the simulation, the interfacial area concentration is first introduced into FLUENT as a user- defined scalar and then the corresponding IATE is solved for the interfacial area concentration. In addition, the associated modifications to the interfacial drag force model and turbulence model are made to reflect the evolution of the bubble size by replacing the constant bubble diameter in those models with the Sauter mean diameter, which is a function of the void fraction and interfacial area concentration. With comparisons between the simulation results and available experimental data, satisfactory agreement has been achieved, which demonstrates that FLUENT code with the one-group IATE provide valuable simulation tool for bubbly two-phase flows.

Book Interfacial Fluid Dynamics and Transport Processes

Download or read book Interfacial Fluid Dynamics and Transport Processes written by Ranga Narayanan and published by Springer. This book was released on 2013-06-29 with total page 379 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present set of lectures and tutorial reviews deals with various topical aspects related to instabilities of interfacial processes and driven flows from both the theoretical and experimental point of views. New research has been spurred by demands for many applications in material sciences (melting, solidification, electro deposition), biomedical engineering and processing in microgravity environments. This book is intended as both a modern source of reference for researchers in the field as well as an introduction to postgraduate students and non-specialists from related areas.

Book Multiphase Flow Analysis Using Population Balance Modeling

Download or read book Multiphase Flow Analysis Using Population Balance Modeling written by Guan Heng Yeoh and published by Butterworth-Heinemann. This book was released on 2013-08-19 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by leading multiphase flow and CFD experts, this book enables engineers and researchers to understand the use of PBM and CFD frameworks. Population balance approaches can now be used in conjunction with CFD, effectively driving more efficient and effective multiphase flow processes. Engineers familiar with standard CFD software, including ANSYS-CFX and ANSYS–Fluent, will be able to use the tools and approaches presented in this book in the effective research, modeling and control of multiphase flow problems. Builds a complete understanding of the theory behind the application of population balance models and an appreciation of the scale-up of computational fluid dynamics (CFD) and population balance modeling (PBM) to a variety of engineering and industry applications in chemical, pharmaceutical, energy and petrochemical sectors The tools in this book provide the opportunity to incorporate more accurate models in the design of chemical and particulate based multiphase processes Enables readers to translate theory to practical use with CFD software

Book Interfacial Fluid Mechanics

Download or read book Interfacial Fluid Mechanics written by Vladimir S. Ajaev and published by Springer Science & Business Media. This book was released on 2012-02-07 with total page 219 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interfacial Fluid Mechanics: A Mathematical Modeling Approach provides an introduction to mathematical models of viscous flow used in rapidly developing fields of microfluidics and microscale heat transfer. The basic physical effects are first introduced in the context of simple configurations and their relative importance in typical microscale applications is discussed. Then, several configurations of importance to microfluidics, most notably thin films/droplets on substrates and confined bubbles, are discussed in detail. Topics from current research on electrokinetic phenomena, liquid flow near structured solid surfaces,evaporation/condensation, and surfactant phenomena are discussed in the later chapters.

Book Computational Methods for Complex Liquid Fluid Interfaces

Download or read book Computational Methods for Complex Liquid Fluid Interfaces written by Mohammad Taeibi Rahni and published by CRC Press. This book was released on 2015-11-11 with total page 549 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computational Methods for Complex Liquid-Fluid Interfaces highlights key computational challenges involved in the two-way coupling of complex liquid-fluid interfaces. The book covers a variety of cutting-edge experimental and computational techniques ranging from macro- to meso- and microscale approaches (including pivotal applications). As example

Book Colloid and Interface Chemistry for Nanotechnology

Download or read book Colloid and Interface Chemistry for Nanotechnology written by Peter Kralchevsky and published by CRC Press. This book was released on 2016-04-19 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt: Colloid and interface science dealt with nanoscale objects for nearly a century before the term nanotechnology was coined. An interdisciplinary field, it bridges the macroscopic world and the small world of atoms and molecules. Colloid and Interface Chemistry for Nanotechnology is a collection of manuscripts reflecting the activities of research te

Book Three Dimensional Attached Viscous Flow

Download or read book Three Dimensional Attached Viscous Flow written by Ernst Heinrich Hirschel and published by Springer Science & Business Media. This book was released on 2013-10-29 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: Viscous flow is treated usually in the frame of boundary-layer theory and as two-dimensional flow. Books on boundary layers give at most the describing equations for three-dimensional boundary layers, and solutions often only for some special cases. This book provides basic principles and theoretical foundations regarding three-dimensional attached viscous flow. Emphasis is put on general three-dimensional attached viscous flows and not on three-dimensional boundary layers. This wider scope is necessary in view of the theoretical and practical problems to be mastered in practice. The topics are weak, strong, and global interaction, the locality principle, properties of three-dimensional viscous flow, thermal surface effects, characteristic properties, wall compatibility conditions, connections between inviscid and viscous flow, flow topology, quasi-one- and two-dimensional flows, laminar-turbulent transition and turbulence. Though the primary flight speed range is that of civil air transport vehicles, flows past other flying vehicles up to hypersonic speeds are also considered. Emphasis is put on general three-dimensional attached viscous flows and not on three-dimensional boundary layers, as this wider scope is necessary in view of the theoretical and practical problems that have to be overcome in practice. The specific topics covered include weak, strong, and global interaction; the locality principle; properties of three-dimensional viscous flows; thermal surface effects; characteristic properties; wall compatibility conditions; connections between inviscid and viscous flows; flow topology; quasi-one- and two-dimensional flows; laminar-turbulent transition; and turbulence. Detailed discussions of examples illustrate these topics and the relevant phenomena encountered in three-dimensional viscous flows. The full governing equations, reference-temperature relations for qualitative considerations and estimations of flow properties, and coordinates for fuselages and wings are also provided. Sample problems with solutions allow readers to test their understanding.

Book Simulation of Complex Three dimensional Flows

Download or read book Simulation of Complex Three dimensional Flows written by George S. Diewert and published by . This book was released on 1985 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Meshfree Methods for Partial Differential Equations VIII

Download or read book Meshfree Methods for Partial Differential Equations VIII written by Michael Griebel and published by Springer. This book was released on 2017-04-05 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: There have been substantial developments in meshfree methods, particle methods, and generalized finite element methods since the mid 1990s. The growing interest in these methods is in part due to the fact that they offer extremely flexible numerical tools and can be interpreted in a number of ways. For instance, meshfree methods can be viewed as a natural extension of classical finite element and finite difference methods to scattered node configurations with no fixed connectivity. Furthermore, meshfree methods have a number of advantageous features that are especially attractive when dealing with multiscale phenomena: A-priori knowledge about the solution’s particular local behavior can easily be introduced into the meshfree approximation space, and coarse scale approximations can be seamlessly refined by adding fine scale information. However, the implementation of meshfree methods and their parallelization also requires special attention, for instance with respect to numerical integration.

Book Multiphase Flow Handbook Second Edition

Download or read book Multiphase Flow Handbook Second Edition written by Efstathios Michaelides and published by CRC Press. This book was released on 2016-10-26 with total page 1559 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Multiphase Flow Handbook, Second Edition is a thoroughly updated and reorganized revision of the late Clayton Crowe’s work, and provides a detailed look at the basic concepts and the wide range of applications in this important area of thermal/fluids engineering. Revised by the new editors, Efstathios E. (Stathis) Michaelides and John D. Schwarzkopf, the new Second Edition begins with two chapters covering fundamental concepts and methods that pertain to all the types and applications of multiphase flow. The remaining chapters cover the applications and engineering systems that are relevant to all the types of multiphase flow and heat transfer. The twenty-one chapters and several sections of the book include the basic science as well as the contemporary engineering and technological applications of multiphase flow in a comprehensive way that is easy to follow and be understood. The editors created a common set of nomenclature that is used throughout the book, allowing readers to easily compare fundamental theory with currently developing concepts and applications. With contributed chapters from sixty-two leading experts around the world, the Multiphase Flow Handbook, Second Edition is an essential reference for all researchers, academics and engineers working with complex thermal and fluid systems.