January 21, 2021

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Liutex and Its Applications in Turbulence Research

Liutex and Its Applications in Turbulence Research
Author : Chaoqun Liu,Hongyi Xu,Xiaoshu Cai,Yisheng Gao
Publisher : Academic Press
Release Date : 2020-10-29
Category : Science
Total pages :458
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Liutex and Its Applications in Turbulence Research reviews the history of vortex definition, provides an accurate mathematical definition of vortices, and explains their applications in flow transition, turbulent flow, flow control, and turbulent flow experiments. The book explains the term "Rortex" as a mathematically defined rigid rotation of fluids or vortex, which could help solve many longstanding problems in turbulence research. The accurate mathematical definition of the vortex is important in a range of industrial contexts, including aerospace, turbine machinery, combustion, and electronic cooling systems, so there are many areas of research that can benefit from the innovations described here. This book provides a thorough survey of the latest research in generalized and flow-thermal, unified, law-of-the-wall for wall-bounded turbulence. Important theory and methodologies used for developing these laws are described in detail, including: the classification of the conventional turbulent boundary layer concept based on proper velocity scaling; the methodology for identification of the scales of velocity, temperature, and length needed to establish the law; and the discovery, proof, and strict validations of the laws, with both Reynolds and Prandtl number independency properties using DNS data. The establishment of these statistical laws is important to modern fluid mechanics and heat transfer research, and greatly expands our understanding of wall-bounded turbulence. Provides an accurate mathematical definition of vortices Provides a thorough survey of the latest research in generalized and flow-thermal, unified, law-of-the-wall for wall-bounded turbulence Explains the term “Rortex as a mathematically defined rigid rotation of fluids or vortex Covers the statistical laws important to modern fluid mechanics and heat transfer research, and greatly expands our understanding of wall-bounded turbulence

Liutex-based and Other Mathematical, Computational and Experimental Methods for Turbulence Structure

Liutex-based and Other Mathematical, Computational and Experimental Methods for Turbulence Structure
Author : Chaoqun Liu,Yisheng Gao
Publisher : Bentham Science Publishers
Release Date : 2020-04-28
Category : Science
Total pages :343
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The knowledge of quantitative turbulence mechanics relies heavily upon the definition of the concept of a vortex in mathematical terms. This reference work introduces the reader to Liutex, which is an accepted, accurate and mathematical definition of a vortex. The core of this book is a compilation of several papers on the subject. presented in the 13th World Congress of Computational Mechanics (WCCM2018), Symposium 704, Mathematics and Computations for Multiscale Structures of Turbulent and Other Complex Flows, New York, United States on July 27, 2018. This compilation also includes other research papers which explain the work done on the vortex definition, vortex identification and turbulence structure from different insight angles including mathematics, computational physics and experiments. The thirteen chapters in this volume will be informative to scientists and engineers who are interested in advanced theories about fluid dynamics, vortex science and turbulence research.

Gas-Particle and Granular Flow Systems

Gas-Particle and Granular Flow Systems
Author : Nan Gui,Shengyao Jiang,Jiyuan Tu,Xingtuan Yang
Publisher : Elsevier
Release Date : 2019-10-22
Category : Computers
Total pages :386
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Gas-Particle and Granular Flow Systems: Coupled Numerical Methods and Applications breaks down complexities, details numerical methods (including basic theory, modeling and techniques in programming), and provides researchers with an introduction and starting point to each of the disciplines involved. As the modeling of gas-particle and granular flow systems is an emerging interdisciplinary field of study involving mathematics, numerical methods, computational science, and mechanical, chemical and nuclear engineering, this book provides an ideal resource for new researchers who are often intimidated by the complexities of fluid-particle, particle-particle, and particle-wall interactions in many disciplines. Presents the most recent advances in modeling of gas-particle and granular flow systems Features detailed and multidisciplinary case studies at the conclusion of each chapter to underscore key concepts Discusses coupled methods of particle and granular flow systems theory and includes advanced modeling tools and numerical techniques

Computational Fluid Dynamics

Computational Fluid Dynamics
Author : Jiyuan Tu,Guan Heng Yeoh,Chaoqun Liu
Publisher : Butterworth-Heinemann
Release Date : 2012-11-21
Category : Computers
Total pages :440
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An introduction to CFD fundamentals and using commercial CFD software to solve engineering problems, designed for the wide variety of engineering students new to CFD, and for practicing engineers learning CFD for the first time. Combining an appropriate level of mathematical background, worked examples, computer screen shots, and step by step processes, this book walks the reader through modeling and computing, as well as interpreting CFD results. The first book in the field aimed at CFD users rather than developers. New to this edition: A more comprehensive coverage of CFD techniques including discretisation via finite element and spectral element as well as finite difference and finite volume methods and multigrid method. Coverage of different approaches to CFD grid generation in order to closely match how CFD meshing is being used in industry. Additional coverage of high-pressure fluid dynamics and meshless approach to provide a broader overview of the application areas where CFD can be used. 20% new content

Computational Fluid Dynamics

Computational Fluid Dynamics
Author : Jiyuan Tu,Guan-Heng Yeoh,Chaoqun Liu
Publisher : Butterworth-Heinemann
Release Date : 2018-02-06
Category : Technology & Engineering
Total pages :498
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Computational Fluid Dynamics: A Practical Approach, Third Edition, is an introduction to CFD fundamentals and commercial CFD software to solve engineering problems. The book is designed for a wide variety of engineering students new to CFD, and for practicing engineers learning CFD for the first time. Combining an appropriate level of mathematical background, worked examples, computer screen shots, and step-by-step processes, this book walks the reader through modeling and computing, as well as interpreting CFD results. This new edition has been updated throughout, with new content and improved figures, examples and problems. Includes a new chapter on practical guidelines for mesh generation Provides full coverage of high-pressure fluid dynamics and the meshless approach to provide a broader overview of the application areas where CFD can be used Includes online resources with a new bonus chapter featuring detailed case studies and the latest developments in CFD

New Perspectives in Fluid Dynamics

New Perspectives in Fluid Dynamics
Author : Chaoqun Liu
Publisher : BoD – Books on Demand
Release Date : 2015-12-02
Category : Science
Total pages :134
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This book contains five chapters detailing significant advances in and applications of new turbulence theory and fluid dynamics modeling with a focus on wave propagation from arbitrary depths to shallow waters, computational modeling for predicting optical distortions through hypersonic flow fields, wind strokes over highway bridges, optimal crop production in a greenhouse, and technological appliance and performance concerns in wheelchair racing. We hope this book to be a useful resource to scientists and engineers who are interested in the fundamentals and applications of fluid dynamics.

Vorticity and Vortex Dynamics

Vorticity and Vortex Dynamics
Author : Jie-Zhi Wu,Hui-yang Ma,M.-D. Zhou
Publisher : Springer Science & Business Media
Release Date : 2007-04-20
Category : Technology & Engineering
Total pages :776
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This book is a comprehensive and intensive monograph for scientists, engineers and applied mathematicians, as well as graduate students in fluid dynamics. It starts with a brief review of fundamentals of fluid dynamics, with an innovative emphasis on the intrinsic orthogonal decomposition of fluid dynamics process. This is followed by vortex dynamics dealing with the motion, interaction, stability, and breakdown of various vortices. Typical vortex structures are analyzed in laminar, translational, and turbulent flows, including stratified and rotational fluids. In another chapter vortical flow management is presented, such as diagnostics and control. Physical understanding of vortical flow phenomena and mechanisms is the first priority throughout the book. To make the book self-contained, some mathematical background is briefly presented in the main text, but major prerequisites are systematically given in appendices.

Shock Wave-Boundary-Layer Interactions

Shock Wave-Boundary-Layer Interactions
Author : Holger Babinsky,John K. Harvey
Publisher : Cambridge University Press
Release Date : 2011-09-12
Category : Technology & Engineering
Total pages :129
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Shock wave-boundary-layer interaction (SBLI) is a fundamental phenomenon in gas dynamics that is observed in many practical situations, ranging from transonic aircraft wings to hypersonic vehicles and engines. SBLIs have the potential to pose serious problems in a flowfield; hence they often prove to be a critical - or even design limiting - issue for many aerospace applications. This is the first book devoted solely to a comprehensive, state-of-the-art explanation of this phenomenon. It includes a description of the basic fluid mechanics of SBLIs plus contributions from leading international experts who share their insight into their physics and the impact they have in practical flow situations. This book is for practitioners and graduate students in aerodynamics who wish to familiarize themselves with all aspects of SBLI flows. It is a valuable resource for specialists because it compiles experimental, computational and theoretical knowledge in one place.

Vortical Flows

Vortical Flows
Author : Jie-Zhi Wu,Hui-Yang Ma,Ming-De Zhou
Publisher : Springer
Release Date : 2015-06-23
Category : Technology & Engineering
Total pages :446
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This book is a comprehensive and intensive book for graduate students in fluid dynamics as well as scientists, engineers and applied mathematicians. Offering a systematic introduction to the physical theory of vortical flows at graduate level, it considers the theory of vortical flows as a branch of fluid dynamics focusing on shearing process in fluid motion, measured by vorticity. It studies vortical flows according to their natural evolution stages,from being generated to dissipated. As preparation, the first three chapters of the book provide background knowledge for entering vortical flows. The rest of the book deals with vortices and vortical flows, following their natural evolution stages. Of various vortices the primary form is layer-like vortices or shear layers, and secondary but stronger form is axial vortices mainly formed by the rolling up of shear layers. Problems are given at the end of each chapter and Appendix, some for helping understanding the basic theories, and some involving specific applications; but the emphasis of both is always on physical thinking.

Multiphase Flow Analysis Using Population Balance Modeling

Multiphase Flow Analysis Using Population Balance Modeling
Author : Guan Heng Yeoh,Dr. Chi Pok Cheung,Jiyuan Tu
Publisher : Butterworth-Heinemann
Release Date : 2013-08-19
Category : Science
Total pages :384
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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

FUNDAMENTALS OF MECHANICAL ENGINEERING

FUNDAMENTALS OF MECHANICAL ENGINEERING
Author : SAWHNEY, G. S.
Publisher : PHI Learning Pvt. Ltd.
Release Date : 2015-06-30
Category : Technology & Engineering
Total pages :960
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Written with the first year engineering students of undergraduate level in mind, the well-designed textbook, now in its Third Edition, explains the fundamentals of mechanical engineering in the area of thermodynamics, mechanics, theory of machines, strength of materials and fluid dynamics. As these subjects form a basic part of an engineer’s education, this text is admirably suited to meet the needs of the common course in mechanical engineering prescribed in the curricula of almost all branches of engineering. This revised edition includes a new chapter on ‘Fluid Dynamics’ to meet the course requirement. Key Features • Presents an introduction to basic mechanical engineering topics required by all engineering students in their studies. • Includes a series of objective type question (True and False, Fill in the Blanks and Multiple Choice Questions) with explanatory answers to help students in preparing for competitive examinations. • Provides a large number of solved problems culled from the latest university and competitive examination papers which help in understanding theory.

Vortex Flow in Nature and Technology

Vortex Flow in Nature and Technology
Author : Hans J. Lugt
Publisher : Wiley-Interscience
Release Date : 1983
Category : Dynamic meteorology
Total pages :297
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Solutions of the Taylor-Green Vortex Problem Using High-Resolution Explicit Finite Difference Methods

Solutions of the Taylor-Green Vortex Problem Using High-Resolution Explicit Finite Difference Methods
Author : National Aeronautics and Space Adm Nasa
Publisher : Independently Published
Release Date : 2019-01-14
Category : Science
Total pages :30
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A computational fluid dynamics code that solves the compressible Navier-Stokes equations was applied to the Taylor-Green vortex problem to examine the code s ability to accurately simulate the vortex decay and subsequent turbulence. The code, WRLES (Wave Resolving Large-Eddy Simulation), uses explicit central-differencing to compute the spatial derivatives and explicit Low Dispersion Runge-Kutta methods for the temporal discretization. The flow was first studied and characterized using Bogey & Bailley s 13-point dispersion relation preserving (DRP) scheme. The kinetic energy dissipation rate, computed both directly and from the enstrophy field, vorticity contours, and the energy spectra are examined. Results are in excellent agreement with a reference solution obtained using a spectral method and provide insight into computations of turbulent flows. In addition the following studies were performed: a comparison of 4th-, 8th-, 12th- and DRP spatial differencing schemes, the effect of the solution filtering on the results, the effect of large-eddy simulation sub-grid scale models, and the effect of high-order discretization of the viscous terms. DeBonis, James R. Glenn Research Center WBS 561581.02.08.03.48.01

Direct and Large-Eddy Simulation II

Direct and Large-Eddy Simulation II
Author : Jean-Pierre Chollet,Peter R. Voke,Leonhard Kleiser
Publisher : Springer Science & Business Media
Release Date : 2012-12-06
Category : Science
Total pages :426
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Progress in the numerical simulation of turbulence has been rapid in the 1990s. New techniques both for the numerical approximation of the Navier-Stokes equations and for the subgrid-scale models used in large-eddy simulation have emerged and are being widely applied for both fundamental and applied engineering studies, along with novel ideas for the performance and use of simulation for compressible, chemically reacting and transitional flows. This collection of papers from the second ERCOFTAC Workshop on Direct and Large-Eddy Simulation, held in Grenoble in September 1996, presents the key research being undertaken in Europe and Japan on these topics. Describing in detail the ambitious use of DNS for fundamental studies and of LES for complex flows of potential and actual engineering importance, this volume will be of interest to all researchers active in the area.

Introduction to Fluid Mechanics, Sixth Edition

Introduction to Fluid Mechanics, Sixth Edition
Author : William S. Janna
Publisher : CRC Press
Release Date : 2020-03-31
Category : Technology & Engineering
Total pages :734
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Introduction to Fluid Mechanics, Sixth Edition, is intended to be used in a first course in Fluid Mechanics, taken by a range of engineering majors. The text begins with dimensions, units, and fluid properties, and continues with derivations of key equations used in the control-volume approach. Step-by-step examples focus on everyday situations, and applications. These include flow with friction through pipes and tubes, flow past various two and three dimensional objects, open channel flow, compressible flow, turbomachinery and experimental methods. Design projects give readers a sense of what they will encounter in industry. A solutions manual and figure slides are available for instructors.