Liutex and Its Applications in Turbulence Research

Liutex and Its Applications in Turbulence Research
Author: Chaoqun Liu,Hongyi Xu,Xiaoshu Cai,Yisheng Gao
Publsiher: Academic Press
Total Pages: 250
Release: 2020-11-13
ISBN: 012819023X
Category: Science
Language: EN, FR, DE, ES & NL

Liutex and Its Applications in Turbulence Research Book Excerpt:

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 and Its Applications in Turbulence Research

Liutex and Its Applications in Turbulence Research
Author: Chaoqun Liu,Hongyi Xu,Xiaoshu Cai,Yisheng Gao
Publsiher: Academic Press
Total Pages: 458
Release: 2020-10-29
ISBN: 0128190248
Category: Science
Language: EN, FR, DE, ES & NL

Liutex and Its Applications in Turbulence Research Book Excerpt:

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 and Third Generation of Vortex Definition and Identification

Liutex and Third Generation of Vortex Definition and Identification
Author: Chaoqun Liu,Yiqian Wang
Publsiher: Springer Nature
Total Pages: 468
Release: 2021-07-26
ISBN: 3030702170
Category: Science
Language: EN, FR, DE, ES & NL

Liutex and Third Generation of Vortex Definition and Identification Book Excerpt:

This book collects papers presented in the Invited Workshop, “Liutex and Third Generation of Vortex Definition and Identification for Turbulence,” from CHAOS2020, June 9-12, 2020, which was held online as a virtual conference. Liutex is a new physical quantity introduced by Prof. Chaoqun Liu of the University of Texas at Arlington. It is a vector and could give a unique and accurate mathematical definition for fluid rotation or vortex. The papers in this volume include some Liutex theories and many applications in hydrodynamics, aerodynamics and thermal dynamics including turbine machinery. As vortex exists everywhere in the universe, a mathematical definition of vortex or Liutex will play a critical role in scientific research. There is almost no place without vortex in fluid dynamics. As a projection, the Liutex theory will play an important role on the investigations of the vortex dynamics in hydrodynamics, aerodynamics, thermodynamics, oceanography, meteorology, metallurgy, civil engineering, astronomy, biology, etc. and to the researches of the generation, sustenance, modelling and controlling of turbulence.

Adaptive Optics Theory and Its Application in Optical Wireless Communication

Adaptive Optics Theory and Its Application in Optical Wireless Communication
Author: Xizheng Ke,Pengfei Wu
Publsiher: Springer Nature
Total Pages: 377
Release: 2022-03-23
ISBN: 9811679010
Category: Technology & Engineering
Language: EN, FR, DE, ES & NL

Adaptive Optics Theory and Its Application in Optical Wireless Communication Book Excerpt:

This book introduces in detail the theory of adaptive optics and its correction technology for light wave distortion in wireless optical communication. It discusses the adaptive control algorithm of wavefront distortion, proportional+integral control algorithm and iterative control algorithm, and double fuzzy adaptive PID control algorithm. It also covers the SPGD algorithm of adaptive optics correction, deformable mirrors eigenmode method of wavefront aberration correction, vortex beam wavefront detecting wavefront aberration correction, liquid crystal spatial light modulator wavefront correction, different wavelengths of Gaussian beam transmission wavefront differences in the atmospheric turbulence and correction and with wavefront tilt correction adaptive optics wavefront aberration correction. Various distortion correction methods are verified by experiments and the experimental results are analyzed. This book is suitable for engineering and technical personnel engaged in wireless optical communication, college teachers, graduate students and senior undergraduate students.

Fluid Dynamics in Physics Engineering and Environmental Applications

Fluid Dynamics in Physics  Engineering and Environmental Applications
Author: Jaime Klapp,Abraham Medina,Anne Cros,Carlos A. Vargas
Publsiher: Springer Science & Business Media
Total Pages: 534
Release: 2012-10-14
ISBN: 3642277225
Category: Science
Language: EN, FR, DE, ES & NL

Fluid Dynamics in Physics Engineering and Environmental Applications Book Excerpt:

The book contains invited lectures and selected contributions presented at the Enzo Levi and XVII Annual Meeting of the Fluid Dynamic Division of the Mexican Physical Society in 2011. It is aimed to fourth year undergraduate and graduate students, and scientists in the field of physics, engineering and chemistry that have interest in Fluid Dynamics from the experimental and theoretical point of view. The invited lectures are introductory and avoid the use of complicate mathematics. The other selected contributions are also adequate to fourth year undergraduate and graduate students. The Fluid Dynamics applications include multiphase flow, convection, diffusion, heat transfer, rheology, granular material, viscous flow, porous media flow, geophysics and astrophysics. The material contained in the book includes recent advances in experimental and theoretical fluid dynamics and is adequate for both teaching and research.

Scientific and Technical Aerospace Reports

Scientific and Technical Aerospace Reports
Author: Anonim
Publsiher: Unknown
Total Pages: 135
Release: 1994
ISBN: 1928374650XXX
Category: Aeronautics
Language: EN, FR, DE, ES & NL

Scientific and Technical Aerospace Reports Book Excerpt:

Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Issues in Aerospace and Defense Research and Application 2011 Edition

Issues in Aerospace and Defense Research and Application  2011 Edition
Author: Anonim
Publsiher: ScholarlyEditions
Total Pages: 383
Release: 2012-01-09
ISBN: 1464966680
Category: Technology & Engineering
Language: EN, FR, DE, ES & NL

Issues in Aerospace and Defense Research and Application 2011 Edition Book Excerpt:

Issues in Aerospace and Defense Research and Application: 2011 Edition is a ScholarlyEditions™ eBook that delivers timely, authoritative, and comprehensive information about Aerospace and Defense Research and Application. The editors have built Issues in Aerospace and Defense Research and Application: 2011 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Aerospace and Defense Research and Application in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Issues in Aerospace and Defense Research and Application: 2011 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.

Air Force Scientific Research Bibliography 1950 56

Air Force Scientific Research Bibliography  1950 56
Author: Library of Congress. Science and Technology Division
Publsiher: Unknown
Total Pages: 135
Release: 1961
ISBN: 1928374650XXX
Category: Military research
Language: EN, FR, DE, ES & NL

Air Force Scientific Research Bibliography 1950 56 Book Excerpt:

Vortex Rings and Jets

Vortex Rings and Jets
Author: Daniel T. H. New,Simon C. M. Yu
Publsiher: Springer
Total Pages: 235
Release: 2015-03-26
ISBN: 9812873961
Category: Technology & Engineering
Language: EN, FR, DE, ES & NL

Vortex Rings and Jets Book Excerpt:

In this book, recent developments in our understanding of fundamental vortex ring and jet dynamics will be discussed, with a view to shed light upon their near-field behaviour which underpins much of their far-field characteristics. The chapters provide up-to-date research findings by their respective experts and seek to link near-field flow physics of vortex ring and jet flows with end-applications in mind. Over the past decade, our knowledge on vortex ring and jet flows has grown by leaps and bounds, thanks to increasing use of high-fidelity, high-accuracy experimental techniques and numerical simulations. As such, we now have a much better appreciation and understanding on the initiation and near-field developments of vortex ring and jet flows under many varied initial and boundary conditions. Chapter 1 outlines the vortex ring pinch-off phenomenon and how it relates to the initial stages of jet formations and subsequent jet behaviour, while Chapter 2 takes a closer look at the behaviour resulting from vortex ring impingement upon solid boundaries and how the use of a porous surface alters the impingement process. Chapters 3 and 4 focus upon the formation of synthetic jets from vortex ring structures experimentally and numerically, the challenges in understanding the relationships between their generation parameters and how they can be utilized in flow separation control problems. Chapter 5 looks at the use of imposing selected nozzle trailing-edge modifications to effect changes upon the near-field dynamics associated with circular, noncircular and coaxial jets, with a view to control their mixing behaviour. And last but not least, Chapter 6 details the use of unique impinging jet configurations and how they may lend themselves towards greater understanding and operating efficacies in heat transfer problems. This book will be useful to postgraduate students and researchers alike who wish to get up to speed regarding the latest developments in vortex ring and jet flow behaviour and how their interesting flow dynamics may be put into good use in their intended applications.

Dynamics of Quantised Vortices in Superfluids

Dynamics of Quantised Vortices in Superfluids
Author: Edouard B. Sonin
Publsiher: Cambridge University Press
Total Pages: 432
Release: 2016-02-29
ISBN: 1107006686
Category: Science
Language: EN, FR, DE, ES & NL

Dynamics of Quantised Vortices in Superfluids Book Excerpt:

Draws together all the basic principles of vortex dynamics in neutral superfluids in one comprehensive volume.

Applied Computational Fluid Dynamics and Turbulence Modeling

Applied Computational Fluid Dynamics and Turbulence Modeling
Author: Sal Rodriguez
Publsiher: Springer Nature
Total Pages: 306
Release: 2019-12-06
ISBN: 3030286916
Category: Computers
Language: EN, FR, DE, ES & NL

Applied Computational Fluid Dynamics and Turbulence Modeling Book Excerpt:

This unique text provides engineering students and practicing professionals with a comprehensive set of practical, hands-on guidelines and dozens of step-by-step examples for performing state-of-the-art, reliable computational fluid dynamics (CFD) and turbulence modeling. Key CFD and turbulence programs are included as well. The text first reviews basic CFD theory, and then details advanced applied theories for estimating turbulence, including new algorithms created by the author. The book gives practical advice on selecting appropriate turbulence models and presents best CFD practices for modeling and generating reliable simulations. The author gathered and developed the book’s hundreds of tips, tricks, and examples over three decades of research and development at three national laboratories and at the University of New Mexico—many in print for the first time in this book. The book also places a strong emphasis on recent CFD and turbulence advancements found in the literature over the past five to 10 years. Readers can apply the author’s advice and insights whether using commercial or national laboratory software such as ANSYS Fluent, STAR-CCM, COMSOL, Flownex, SimScale, OpenFOAM, Fuego, KIVA, BIGHORN, or their own computational tools. Applied Computational Fluid Dynamics and Turbulence Modeling is a practical, complementary companion for academic CFD textbooks and senior project courses in mechanical, civil, chemical, and nuclear engineering; senior undergraduate and graduate CFD and turbulence modeling courses; and for professionals developing commercial and research applications.

Air Force Research Review

Air Force Research Review
Author: United States. Air Force. Systems Command
Publsiher: Unknown
Total Pages: 135
Release: 1970
ISBN: 1928374650XXX
Category: Electronic Book
Language: EN, FR, DE, ES & NL

Air Force Research Review Book Excerpt:

Perspectives in Turbulence Studies

Perspectives in Turbulence Studies
Author: Hans U. Meier,Peter Bradshaw
Publsiher: Springer Science & Business Media
Total Pages: 504
Release: 2012-12-06
ISBN: 3642829945
Category: Science
Language: EN, FR, DE, ES & NL

Perspectives in Turbulence Studies Book Excerpt:

The present volume entitled "Perspectives in Turbulence Stud ies" is dedicated to Dr. Ing. E. h. Julius C. Rotta in honour of his 75th birthday. J. C. Rotta, born on January 1, 1912, started his outstanding career in an unusual way, namely in a drawing office (1928 - 1931). At the same time he - as a purely self taught perso- took a correspondence course in airplane construction. From 1934 to 1945 he worked in the aircraft industry on different subjects in the fields of flight mechanics, structures, air craft design, and aerodynamics. In 1945 he moved to Gottingen and worked from that time at the Aerodynamische Versuchsanstalt (AVA, now DFVLR) and the Max-Planck-Institut fur Stromungsforschung (1947-1958), interrupted only by a stay in the U. S. at the Glenn L. Martin Company (1954 - 1955) and a visiting professorship at the Laval University in Quebec, Canada (1956). Already during his activities in industry, Dr. Rotta discovered his special liking for aerodynamics. In Gottingen, he was attracted by Ludwig Prandtl's discussions about problems associated with turbulence and in particular his new contribution to fully developed turbulence, published in 1945. At that time, W. Heisenberg and C. F. v. Weizacker pub lished their results on the energy spectra of isotropic turbu lence at large wave numbers. Since that time his main research interest in reasearch has been in turbulence problems.

Institute for Computational Mechanics in Propulsion ICOMP

Institute for Computational Mechanics in Propulsion  ICOMP
Author: Charles E. Feiler
Publsiher: Unknown
Total Pages: 50
Release: 1992
ISBN: 1928374650XXX
Category: Electronic Book
Language: EN, FR, DE, ES & NL

Institute for Computational Mechanics in Propulsion ICOMP Book Excerpt:

On the Application of a Hairpin Vortex Model of Wall Turbulence to Trailing Edge Noise Prediction

On the Application of a Hairpin Vortex Model of Wall Turbulence to Trailing Edge Noise Prediction
Author: Anonim
Publsiher: Unknown
Total Pages: 57
Release: 1985
ISBN: 1928374650XXX
Category: Electronic Book
Language: EN, FR, DE, ES & NL

On the Application of a Hairpin Vortex Model of Wall Turbulence to Trailing Edge Noise Prediction Book Excerpt:

Advances in Turbulence IV

Advances in Turbulence IV
Author: F.T. Nieuwstadt
Publsiher: Springer Science & Business Media
Total Pages: 575
Release: 1993-06-30
ISBN: 9780792322825
Category: Technology & Engineering
Language: EN, FR, DE, ES & NL

Advances in Turbulence IV Book Excerpt:

The European Turbulence Conferences have been organized under the auspices of the European Mechanics Committee (Euromech) to provide a forum for discussion and exchange of recent and new results in the field of turbulence. The first conference was organized in Lyon in 1986 with 152 participants. The second and third conferences were held in Berlin (1988) and Stockholm (1990) with 165 and 172 participants respectively. The fourth was organized in Delft from 30 June to 3 July 1992 by the J.M. Burgers Centre. There were 214 participants from 22 countries. This steadily growing number of participants demonstrates both the success and need for this type of conference. The main topics of the Fourth European Turbulence Conference were: Dynamical Systems and Transition; Statistical Physics and Turbulence; Experiments and Novel Experimental Techniques; Particles and Bubbles in Turbulence; Simulation Methods; Coherent Structures; Turbulence Modelling and Compressibility Effects. In addition a special session was held on the subject of CeBular Automata. Each of the sessions was introduced with a survey lecture. The lecturers were: W. Eckhaus, AJ. Libchaber, L. Katgerman, F. Durst, M. Lesieur, B. Legras, D.G. Dritschel and P. Bradshaw. The contributions of the participants were subdivided into oral and poster presentations. In addition to the normal program, some Speciai Interest Groups of Ercoftac (European Research Community on Flow, Turbulence and Combustion) presented their research activities in the form of a poster.

The Application of Laser Doppler Velocimetry to Trailing Vortex Definition and Alleviation

The Application of Laser Doppler Velocimetry to Trailing Vortex Definition and Alleviation
Author: Anonim
Publsiher: Unknown
Total Pages: 35
Release: 1973
ISBN: 1928374650XXX
Category: Electronic Book
Language: EN, FR, DE, ES & NL

The Application of Laser Doppler Velocimetry to Trailing Vortex Definition and Alleviation Book Excerpt:

Quantized Vortex Dynamics and Superfluid Turbulence

Quantized Vortex Dynamics and Superfluid Turbulence
Author: C.F. Barenghi,R.J. Donnelly,W.F. Vinen
Publsiher: Springer
Total Pages: 458
Release: 2008-01-11
ISBN: 3540455426
Category: Technology & Engineering
Language: EN, FR, DE, ES & NL

Quantized Vortex Dynamics and Superfluid Turbulence Book Excerpt:

This book springs from the programme Quantized Vortex Dynamics and Sup- ?uid Turbulence held at the Isaac Newton Institute for Mathematical Sciences (University of Cambridge) in August 2000. What motivated the programme was the recognition that two recent developments have moved the study of qu- tized vorticity, traditionally carried out within the low-temperature physics and condensed-matter physics communities, into a new era. The ?rst development is the increasing contact with classical ?uid dynamics and its ideas and methods. For example, some current experiments with - lium II now deal with very classical issues, such as the measurement of velocity spectra and turbulence decay rates. The evidence from these experiments and many others is that super?uid turbulence and classical turbulence share many features. The challenge is now to explain these similarities and explore the time scales and length scales over which they hold true. The observed classical aspects have also attracted attention to the role played by the ?ow of the normal ?uid, which was somewhat neglected in the past because of the lack of direct ?ow visualization. Increased computing power is also making it possible to study the coupled motion of super?uid vortices and normal ?uids. Another contact with classical physics arises through the interest in the study of super?uid vortex - connections. Reconnections have been studied for some time in the contexts of classical ?uid dynamics and magneto-hydrodynamics (MHD), and it is useful to learn from the experience acquired in other ?elds.

Turbulence Modelling Approaches

Turbulence Modelling Approaches
Author: Konstantin Volkov
Publsiher: BoD – Books on Demand
Total Pages: 250
Release: 2017-07-26
ISBN: 9535133497
Category: Science
Language: EN, FR, DE, ES & NL

Turbulence Modelling Approaches Book Excerpt:

Accurate prediction of turbulent flows remains a challenging task despite considerable work in this area and the acceptance of CFD as a design tool. The quality of the CFD calculations of the flows in engineering applications strongly depends on the proper prediction of turbulence phenomena. Investigations of flow instability, heat transfer, skin friction, secondary flows, flow separation, and reattachment effects demand a reliable modelling and simulation of the turbulence, reliable methods, accurate programming, and robust working practices. The current scientific status of simulation of turbulent flows as well as some advances in computational techniques and practical applications of turbulence research is reviewed and considered in the book.

Particle Laden Flow

Particle Laden Flow
Author: Bernard Geurts,Herman Clercx,Wim Uijttewaal
Publsiher: Springer Science & Business Media
Total Pages: 423
Release: 2007-08-27
ISBN: 1402062176
Category: Science
Language: EN, FR, DE, ES & NL

Particle Laden Flow 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.