Summary Of The Afosr Msu Research Specialists Workshop On Coherent Structure In Turbulent Boundary Layers

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On the Application and Interpretation of Coherent Motion Detectors

Author : Charles Paul Gendrich
Publisher :
ISBN 13 :
Total Pages : 604 pages
Book Rating : 4.3/5 (129 download)

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Book Synopsis On the Application and Interpretation of Coherent Motion Detectors by : Charles Paul Gendrich

Download or read book On the Application and Interpretation of Coherent Motion Detectors written by Charles Paul Gendrich and published by . This book was released on 1991 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coherent motions are understood to play an important role in enhancing the momentum transport of turbulent wall bounded shear flows, but determining whether or not a coherent motion is present in a given volume of space at a particular time is still a difficult task. Although most detection schemes were developed for use within a specific region above the wall, most are ultimately used throughout the entire boundary layer. Three different probe based algorithms and three different visual detection schemes are applied to combined flow visualization and spanwise vorticity probe data taken in the near wall region and at y/delta of 0.8. Several new performance parameters have been developed, and they are calculated along with most of the commonly used evaluation parameters as functions of detection threshold and Reynolds number or y+. The one to one correspondence between probe based detections and visual detections is also evaluated using two parameters already in common use and a new parameter, P(T, t), which is based on the number of event overlaps as a function of time during an event inner, outer, and mixed variables are used whenever appropriate to scale all results, but only two Reynolds number independent curves are found which describe the outer region response of any detection algorithm as a function of threshold.

Scientific and Technical Aerospace Reports

Author :
Publisher :
ISBN 13 :
Total Pages : 1280 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Scientific and Technical Aerospace Reports by :

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1980 with total page 1280 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Structure of Turbulent Boundary Layers on a Concave Surface

Author : Robert S. Barlow
Publisher :
ISBN 13 :
Total Pages : 276 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Structure of Turbulent Boundary Layers on a Concave Surface by : Robert S. Barlow

Download or read book Structure of Turbulent Boundary Layers on a Concave Surface written by Robert S. Barlow and published by . This book was released on 1985 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Advances in Effective Flow Separation Control for Aircraft Drag Reduction

Author : Ning Qin
Publisher : Springer Nature
ISBN 13 : 3030296881
Total Pages : 340 pages
Book Rating : 4.0/5 (32 download)

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Book Synopsis Advances in Effective Flow Separation Control for Aircraft Drag Reduction by : Ning Qin

Download or read book Advances in Effective Flow Separation Control for Aircraft Drag Reduction written by Ning Qin and published by Springer Nature. This book was released on 2019-10-17 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the results of a European-Chinese collaborative research project, Manipulation of Reynolds Stress for Separation Control and Drag Reduction (MARS), including an analysis and discussion of the effects of a number of active flow control devices on the discrete dynamic components of the turbulent shear layers and Reynolds stress. From an application point of view, it provides a positive and necessary step to control individual structures that are larger in scale and lower in frequency compared to the richness of the temporal and spatial scales in turbulent separated flows.

Turbulent Flow Structure Near Walls

Author : J. D. A. Walker
Publisher :
ISBN 13 :
Total Pages : 184 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Turbulent Flow Structure Near Walls by : J. D. A. Walker

Download or read book Turbulent Flow Structure Near Walls written by J. D. A. Walker and published by . This book was released on 1991 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past decade, progress has been made in determining the nature of turbulent flow near walls. Many of these advances, which have occurred through new experimental methodologies, direct numerical simulations, and new theoretical developments, are described in this volume.

The Effects of Streamwise Concave Curvature on Turbulent Boundary Layer Structure

Author : Albert H. Jeans
Publisher :
ISBN 13 :
Total Pages : 176 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis The Effects of Streamwise Concave Curvature on Turbulent Boundary Layer Structure by : Albert H. Jeans

Download or read book The Effects of Streamwise Concave Curvature on Turbulent Boundary Layer Structure written by Albert H. Jeans and published by . This book was released on 1982 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concave curvature has a relatively large, unpredictable effect on turbulent boundary layers. Some, but not all previous studies suggest that a large-scale, stationary array of counter-rotating vortices exists within the turbulent boundary layer on a concave wall. The objective of the present study was to obtain a qualitative model of the flow field in order to increase our understanding of the underlying physics. A large free-surface water channel was constructed in order to perform a visual study of the flow. Streamwise components of mean velocity and turbulence intensity were measured using a hot film anemometer. The upstream boundary was spanwise uniform with a momentum thickness to radius of curvature of 0.05. Compared to flat wall flow, large-scale, randomly distributed sweeps and ejections were seen in the boundary layer on the concave wall. The sweeps appear to suppress the normal mechanism for turbulence production near the wall by inhibiting the bursting process. The ejections appear to enhance turbulence production in the outer layers as the low speed fluid convected from regions near the wall interacts with the higher speed fluid farther out. The large-scale structures did not occur at fixed spanwise locations, and could not be called roll cells or vortices. (Author).

Technical Abstract Bulletin

Author :
Publisher :
ISBN 13 :
Total Pages : 200 pages
Book Rating : 4.E/5 ( download)

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Download or read book Technical Abstract Bulletin written by and published by . This book was released on 1980 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Philosophical Transactions of the Royal Society of London

Author :
Publisher :
ISBN 13 :
Total Pages : 664 pages
Book Rating : 4.3/5 (812 download)

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Book Synopsis Philosophical Transactions of the Royal Society of London by :

Download or read book Philosophical Transactions of the Royal Society of London written by and published by . This book was released on 1991 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Government Reports Annual Index

Author :
Publisher :
ISBN 13 :
Total Pages : 982 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Government Reports Annual Index by :

Download or read book Government Reports Annual Index written by and published by . This book was released on 1980 with total page 982 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.

Directory of Published Proceedings

Author :
Publisher :
ISBN 13 :
Total Pages : 444 pages
Book Rating : 4.3/5 (91 download)

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Download or read book Directory of Published Proceedings written by and published by . This book was released on 1983 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Experimental Fluid Mechanics

Author : P Bradshaw
Publisher : Elsevier
ISBN 13 : 1483136116
Total Pages : 244 pages
Book Rating : 4.4/5 (831 download)

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Book Synopsis Experimental Fluid Mechanics by : P Bradshaw

Download or read book Experimental Fluid Mechanics written by P Bradshaw and published by Elsevier. This book was released on 2016-06-23 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental Fluid Mechanics, Second Edition, discusses the fundamental concepts of fluid mechanics. The book begins with a discussion of the use of dimensional analysis, in particular the way in which it can be used to relate the results of model tests to flows at full scale. A chapter on wind tunnels follows; because tunnels and other test rigs with similar features are the basic test facilities of laboratory fluid mechanics, and because most of the physical and mathematical features of the subject are well illustrated by the flow in wind tunnels. Subsequent chapters discuss techniques of measurements—fluid velocity and shear stress measurements, pressure measurements, force and position measurements, and flow visualization; the conduct of experiments and the writing of reports; and the last chapter is a survey of specialized branches of fluid mechanics. This book is intended for students of the theory of fluid mechanics, who must also learn about the physical situations which the theory represents, and especially for those who contemplate specializing in the experimental side of the subject rather than the theoretical side.

Advances in Turbulence 2

Author : Hans-Hermann Fernholz
Publisher : Springer Science & Business Media
ISBN 13 : 3642838227
Total Pages : 528 pages
Book Rating : 4.6/5 (428 download)

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Book Synopsis Advances in Turbulence 2 by : Hans-Hermann Fernholz

Download or read book Advances in Turbulence 2 written by Hans-Hermann Fernholz and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Second European Turbulence Conference was held at the Technische Univer sitat Berlin, Federal Republic of Germany, from August 30th to September 2nd 1988 under the auspices of the European Mechanics Committee. It was primar ily devoted to fundamental aspects of turbulence, and aimed at bringing together engineers, physicists, and mathematicians. The scientific committee - serving also as Sub-committee of the European Turbulence Conference - consisted of the following members: G. Comte-Bellot (Lyon), H.-H. Fernholz and H.E. Fiedler (both from Berlin) as co-chairmen of the conference, U. Frisch (Nice), J.C.R. Hunt (Cambridge), E. Krause (Aachen), M. Landahl (Stockholm), A.M. Obukhov (Moscow), and G. Ooms (Amsterdam). The conference programme comprised 6 invited lectures and 94 contributions, presented either orally or at poster sessions. There were 165 participants from 18 countries. All papers published in these conference proceedings were, with the exception of the invited ones, again refereed by the members of the scientific committee. The main research topics discussed at this meeting were stability and gener ation of turbulence, effects of rotation, stratification and buoyancy forces, novel instrumentation, manipulation and control, boundary layers with separation and reattachment, computer simulation, turbulent diffusion, image analysis and flow visualization, vorticity dynamics and turbulence, and large-scale structures. We have taken the liberty of regrouping some papers following the submitted final versions for this volume. Authors may therefore find their paper under a different heading from that in the conference programme.

Instability and Transition

Author : M.Y. Hussaini
Publisher : Springer Science & Business Media
ISBN 13 : 1461234328
Total Pages : 509 pages
Book Rating : 4.4/5 (612 download)

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Book Synopsis Instability and Transition by : M.Y. Hussaini

Download or read book Instability and Transition written by M.Y. Hussaini and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 509 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ability to predict and control viscous flow phenomena is becoming increasingly important in modern industrial application. The Instability and Transition Workshop at Langley was extremely important in help§ ing the scientists community to access the state of knowledge in the area of transition from laminar to turbulent flow, to identify promising future areas of research and to build future interactions between researchers worldwide working in the areas of theoretical, experimental and computational fluid and aero dynamics. The set of two volume contains panel discussions and research contribution with the following objectives: (1) expose the academic community to current technologically important issues of instability and transitions in shear flows over the entire speed range, (2) acquaint the academic community with the unique combination of theoretical, computational and experimental capabilities at LaRC and foster interaction with these facilities. (3) review current state-of-the-art and propose future directions for instability and transition research, (4) accelerate progress in elucidating basic understanding of transition phenomena and in transferring this knowledge into improved design methodologies through improved transition modeling, and (5) establish mechanism for continued interaction.

Homogeneous Turbulence Dynamics

Author : Pierre Sagaut
Publisher : Springer
ISBN 13 : 3319731629
Total Pages : 912 pages
Book Rating : 4.3/5 (197 download)

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Book Synopsis Homogeneous Turbulence Dynamics by : Pierre Sagaut

Download or read book Homogeneous Turbulence Dynamics written by Pierre Sagaut and published by Springer. This book was released on 2018-03-23 with total page 912 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides state-of-the-art results and theories in homogeneous turbulence, including anisotropy and compressibility effects with extension to quantum turbulence, magneto-hydodynamic turbulence and turbulence in non-newtonian fluids. Each chapter is devoted to a given type of interaction (strain, rotation, shear, etc.), and presents and compares experimental data, numerical results, analysis of the Reynolds stress budget equations and advanced multipoint spectral theories. The role of both linear and non-linear mechanisms is emphasized. The link between the statistical properties and the dynamics of coherent structures is also addressed. Despite its restriction to homogeneous turbulence, the book is of interest to all people working in turbulence, since the basic physical mechanisms which are present in all turbulent flows are explained. The reader will find a unified presentation of the results and a clear presentation of existing controversies. Special attention is given to bridge the results obtained in different research communities. Mathematical tools and advanced physical models are detailed in dedicated chapters.

Hydraulic Research in the United States

Author :
Publisher :
ISBN 13 :
Total Pages : 230 pages
Book Rating : 4.3/5 (91 download)

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Download or read book Hydraulic Research in the United States written by and published by . This book was released on 1961 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The DARPA Model for Transformative Technologies: Perspectives on the U.S. Defense Advanced Research Projects Agency

Author : William Boone Bonvillian
Publisher : Open Book Publishers
ISBN 13 : 1783747943
Total Pages : 306 pages
Book Rating : 4.7/5 (837 download)

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Book Synopsis The DARPA Model for Transformative Technologies: Perspectives on the U.S. Defense Advanced Research Projects Agency by : William Boone Bonvillian

Download or read book The DARPA Model for Transformative Technologies: Perspectives on the U.S. Defense Advanced Research Projects Agency written by William Boone Bonvillian and published by Open Book Publishers. This book was released on 2020-01-09 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors have done a masterful job of charting the important story of DARPA, one of the key catalysts of technological innovation in US recent history. By plotting the development, achievements and structure of the leading world agency of this kind, this book stimulates new thinking in the field of technological innovation with bearing on how to respond to climate change, pandemics, cyber security and other global problems of our time. The DARPA Model provides a useful guide for governmental agency and policy leaders, and for anybody interested in the role of governments in technological innovation. —Dr. Kent Hughes, Woodrow Wilson International Center for Scholars This volume contains a remarkable collection of extremely insightful articles on the world’s most successful advanced technology agency. Drafted by the leading US experts on DARPA, it provides a variety of perspectives that in turn benefit from being presented together in a comprehensive volume. It reviews DARPA’s unique role in the U.S. innovation system, as well as the challenges DARPA and its clones face today. As the American model is being considered for adoption by a number of countries worldwide, this book makes a welcome and timely contribution to the policy dialogue on the role played by governments in stimulating technological innovation. — Prof. Charles Wessner, Georgetown University The U.S. Defense Advanced Research Projects Agency (DARPA) has played a remarkable role in the creation new transformative technologies, revolutionizing defense with drones and precision-guided munitions, and transforming civilian life with portable GPS receivers, voice-recognition software, self-driving cars, unmanned aerial vehicles, and, most famously, the ARPANET and its successor, the Internet. Other parts of the U.S. Government and some foreign governments have tried to apply the ‘DARPA model’ to help develop valuable new technologies. But how and why has DARPA succeeded? Which features of its operation and environment contribute to this success? And what lessons does its experience offer for other U.S. agencies and other governments that want to develop and demonstrate their own ‘transformative technologies’? This book is a remarkable collection of leading academic research on DARPA from a wide range of perspectives, combining to chart an important story from the Agency’s founding in the wake of Sputnik, to the current attempts to adapt it to use by other federal agencies. Informative and insightful, this guide is essential reading for political and policy leaders, as well as researchers and students interested in understanding the success of this agency and the lessons it offers to others.

BioMEMS and Biomedical Nanotechnology

Author : Mihrimah Ozkan
Publisher : Springer Science & Business Media
ISBN 13 : 0387258434
Total Pages : 554 pages
Book Rating : 4.3/5 (872 download)

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Book Synopsis BioMEMS and Biomedical Nanotechnology by : Mihrimah Ozkan

Download or read book BioMEMS and Biomedical Nanotechnology written by Mihrimah Ozkan and published by Springer Science & Business Media. This book was released on 2007-04-03 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contributions reporting on fundamental and applied investigations of the material science, biochemistry, and physics of biomedical microdevices with applications to Genomics and Proteomics. Topics include gene expression profiling utilizing microarray technology; imaging and sensing for gene detection and use in DNA analysis; and coverage of advanced microfluidic devices and the Humane Genome Project.