Chaoqun Liu's Books

Liutex and Its Applications in Turbulence Research

By: Chaoqun Liu,Hongyi Xu,Xiaoshu Cai,Yisheng Gao

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Liutex and Its Applications in Turbulence Research

By: Chaoqun Liu,Hongyi Xu,Xiaoshu Cai,Yisheng Gao

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

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Page Count

460

Publisher

Academic Press

Published Date

ISBN 10

0128190248

ISBN 13

9780128190241

High Order Large Eddy Simulation for Shock-Boundary Layer Interaction Control by a Micro-ramp Vortex Generator

By: Chaoqun Liu,Qin Li,Yonghua Yan,Yong Yang,Guang Yang ,Xiangrui Dong

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High Order Large Eddy Simulation for Shock-Boundary Layer Interaction Control by a Micro-ramp Vortex Generator

By: Chaoqun Liu,Qin Li,Yonghua Yan,Yong Yang,Guang Yang ,Xiangrui Dong

This volume presents an implicitly implemented large eddy simulation (ILES) by using the fifth order bandwidth-optimized WENO scheme. The chosen method is applied to make comprehensive studies on ramp flows with and without control at Mach 2.5 and Re=5760. Flow control in the form of microramp vortex generators (MVG) is applied. The results show that a MVG can distinctly reduce the separation zone at the ramp corner and lower the boundary layer shape factor under simulated conditions. A series of new findings about the MVG-ramp flow are obtained, including structures relevant to surface pressure, three-dimensional structures of the re-compression shock waves, a complete surface separation pattern, momentum deficit and a new secondary vortex system. A new mechanism of shock-boundary layer interaction control by MVG associated with a series of vortex rings is also presented. Vortex rings strongly interact with air flow and play an important role in the separation zone reduction. Additionally, readers will learn about the governing equation, boundary condition, high quality grid generation, high order shock capturing scheme and DNS inflow condition in detail. This volume will, therefore, serve as a useful reference for aerospace researchers using LES methods to study shock boundary layer interaction and supersonic flow control.

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Page Count

321

Publisher

Bentham Science Publishers

Published Date

ISBN 10

1681085976

ISBN 13

9781681085975

Visual Pattern Discovery and Recognition

By: Hongxing Wang,Chaoqun Weng,Junsong Yuan

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Visual Pattern Discovery and Recognition

By: Hongxing Wang,Chaoqun Weng,Junsong Yuan

This book presents a systematic study of visual pattern discovery, from unsupervised to semi-supervised manner approaches, and from dealing with a single feature to multiple types of features. Furthermore, it discusses the potential applications of discovering visual patterns for visual data analytics, including visual search, object and scene recognition. It is intended as a reference book for advanced undergraduates or postgraduate students who are interested in visual data analytics, enabling them to quickly access the research world and acquire a systematic methodology rather than a few isolated techniques to analyze visual data with large variations. It is also inspiring for researchers working in computer vision and pattern recognition fields. Basic knowledge of linear algebra, computer vision and pattern recognition would be helpful to readers.

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Publisher

Springer

Published Date

ISBN 10

9811048401

ISBN 13

9789811048401

Computational Fluid Dynamics

A Practical Approach

By: Jiyuan Tu,Guan Heng Yeoh,Chaoqun Liu

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Computational Fluid Dynamics

A Practical Approach

By: Jiyuan Tu,Guan Heng Yeoh,Chaoqun Liu

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

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Page Count

500

Publisher

Butterworth-Heinemann

Published Date

ISBN 10

0081012446

ISBN 13

9780081012444

Liutex and Its Applications in Turbulence Research

By: Chaoqun Liu,Hongyi Xu,Xiaoshu Cai,Yisheng Gao

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Liutex and Its Applications in Turbulence Research

By: Chaoqun Liu,Hongyi Xu,Xiaoshu Cai,Yisheng Gao

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Page Count

460

Publisher

Academic Press

Published Date

ISBN 10

0128190248

ISBN 13

9780128190241

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

By: Chaoqun Liu

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

By: Chaoqun Liu

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.

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Page Count

342

Publisher

Current Developments in Mathem

Published Date

ISBN 10

9811437599

ISBN 13

9789811437595

High Order Large Eddy Simulation for Shock-Boundary Layer Interaction Control by a Micro-ramp Vortex Generator

By: Chaoqun Liu,Qin Li,Yonghua Yan,Yong Yang,Guang Yang ,Xiangrui Dong

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High Order Large Eddy Simulation for Shock-Boundary Layer Interaction Control by a Micro-ramp Vortex Generator

By: Chaoqun Liu,Qin Li,Yonghua Yan,Yong Yang,Guang Yang ,Xiangrui Dong

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Page Count

321

Publisher

Bentham Science Publishers

Published Date

ISBN 10

1681085976

ISBN 13

9781681085975

Book's by Chaoqun Liu

Liutex and Its Applications in Turbulence Research

Liutex and Its Applications in Turbulence Research

High Order Large Eddy Simulation for Shock-Boundary Layer Interaction Control by a Micro-ramp Vortex Generator

High Order Large Eddy Simulation for Shock-Boundary Layer Interaction Control by a Micro-ramp Vortex Generator

Visual Pattern Discovery and Recognition

Visual Pattern Discovery and Recognition

Computational Fluid Dynamics

Computational Fluid Dynamics

Liutex and Its Applications in Turbulence Research

Liutex and Its Applications in Turbulence Research

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

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

High Order Large Eddy Simulation for Shock-Boundary Layer Interaction Control by a Micro-ramp Vortex Generator

High Order Large Eddy Simulation for Shock-Boundary Layer Interaction Control by a Micro-ramp Vortex Generator

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