Three Dimensional Separated Flow Topology

Author : Jean Délery
Publisher : John Wiley & Sons
Page : 181 pages
File Size : 47,7 Mb
Release : 2013-02-25
Category : Science
ISBN : 9781848214507

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Three-dimensional Separated Flow Topology by Jean Délery Pdf

This book develops concepts and a methodology for a rational description of the organization of three-dimensional flows considering, in particular, the case where the flow is the place of separations. The descriptive analysis based on the critical point theory of Poincaré develops conventional but rather unfamiliar considerations from aerodynamicists, who face the understanding of complex flows including multiple separation lines and vortices. These problems concern industrial sectors where aerodynamics plays a key role, such as aerospace, ground vehicles, buildings, etc. Contents 1. Skin Friction Lines Pattern and Critical Points. 2. Separation Streamsurfaces and Vortex Structures. 3. Separated Flow on a Body. 4. Vortex Wake of Wings and Slender Bodies. 5. Separation Induced by an Obstacle or a Blunt Body. 6. Reconsideration of the Two-Dimensional Separation. 7. Concluding Remarks. About the Authors Jean Délery is a Supaero (French National Higher School of Aeronautics and Space) engineer who has worked at Onera (French national aerospace research center) since 1964. He has participated in several major French and European aerospace programs, is the author of many scientific publications, and has occupied various teaching positions particularly at Supaero, the University of Versailles-Saint-Quentin, Ecole polytechnique in France and “La Sapienza” University in Rome, Italy. He is currently emeritus adviser at Onera.

Author : Jean Délery
Publisher : John Wiley & Sons
Page : 181 pages
File Size : 52,8 Mb
Release : 2013-02-28
Category : Science
ISBN : 9781118579886

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Three-dimensional Separated Flow Topology by Jean Délery Pdf

This book develops concepts and a methodology for a rational description of the organization of three-dimensional flows considering, in particular, the case where the flow is the place of separations. The descriptive analysis based on the critical point theory of Poincaré develops conventional but rather unfamiliar considerations from aerodynamicists, who face the understanding of complex flows including multiple separation lines and vortices. These problems concern industrial sectors where aerodynamics plays a key role, such as aerospace, ground vehicles, buildings, etc. Contents 1. Skin Friction Lines Pattern and Critical Points. 2. Separation Streamsurfaces and Vortex Structures. 3. Separated Flow on a Body. 4. Vortex Wake of Wings and Slender Bodies. 5. Separation Induced by an Obstacle or a Blunt Body. 6. Reconsideration of the Two-Dimensional Separation. 7. Concluding Remarks. About the Authors Jean Délery is a Supaero (French National Higher School of Aeronautics and Space) engineer who has worked at Onera (French national aerospace research center) since 1964. He has participated in several major French and European aerospace programs, is the author of many scientific publications, and has occupied various teaching positions particularly at Supaero, the University of Versailles-Saint-Quentin, Ecole polytechnique in France and “La Sapienza” University in Rome, Italy. He is currently emeritus adviser at Onera.

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
Page : 50 pages
File Size : 41,6 Mb
Release : 2018-07-15
Category : Electronic
ISBN : 1722924373

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Unsteady Three-Dimensional Flow Separation by National Aeronautics and Space Administration (NASA) Pdf

A concise mathematical framework is constructed to study the topology of steady 3-D separated flows of an incompressible, or a compressible viscous fluid. Flow separation is defined by the existence of a stream surface which intersects with the body surface. The line of separation is itself a skin-friction line. Flow separation is classified as being either regular or singular, depending respectively on whether the line of separation contains only a finite number of singular points or is a singular line of the skin-friction field. The special cases of 2-D and axisymmetric flow separation are shown to be of singular type. In regular separation it is shown that a line of separation originates from a saddle point of separation of the skin-friction field and ends at nodal points of separation. Unsteady flow separation is defined relative to a coordinate system fixed to the body surface. It is shown that separation of an unsteady 3-D incompressible viscous flow at time t, when viewed from such a frame of reference, is topologically the same as that of the fictitious steady flow obtained by freezing the unsteady flow at the instant t. Examples are given showing effects of various forms of flow unsteadiness on flow separation. Hui, W. H. Unspecified Center NAGW-575; RTOP 505-31-01-01...

Author : M. Tobak
Publisher : Unknown
Page : 52 pages
File Size : 54,9 Mb
Release : 1981
Category : Electronic
ISBN : NASA:31769000548027

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Topology of Three-dimensional Separated Flows by M. Tobak Pdf

Author : Paul K. Chang
Publisher : Elsevier
Page : 796 pages
File Size : 41,9 Mb
Release : 2014-06-28
Category : Technology & Engineering
ISBN : 9781483181288

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Separation of Flow by Paul K. Chang Pdf

Interdisciplinary and Advanced Topics in Science and Engineering, Volume 3: Separation of Flow presents the problem of the separation of fluid flow. This book provides information covering the fields of basic physical processes, analyses, and experiments concerning flow separation. Organized into 12 chapters, this volume begins with an overview of the flow separation on the body surface as discusses in various classical examples. This text then examines the analytical and experimental results of the laminar boundary layer of steady, two-dimensional flows in the subsonic speed range. Other chapters consider the study of flow separation on the two-dimensional body, flow separation on three-dimensional body shape and particularly on bodies of revolution. This book discusses as well the analytical solutions of the unsteady flow separation. The final chapter deals with the purpose of separation flow control to raise efficiency or to enhance the performance of vehicles and fluid machineries involving various engineering applications. This book is a valuable resource for engineers.

Author : Klaus Gersten
Publisher : Springer Science & Business Media
Page : 305 pages
File Size : 55,9 Mb
Release : 2013-06-29
Category : Science
ISBN : 9783663139867

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Physics of Separated Flows — Numerical, Experimental, and Theoretical Aspects by Klaus Gersten Pdf

This volume contains 37 contributions in which the research work is summarized which has been carried out between 1984 and 1990 in the Priority Research Program "Physik abgeloster Stromungen" of the Deutsche Forschungsgemeinschaft (DFG, German Research Society). The aim of the Priority Research Program was the inten sive research of the whole range of phenomena associated with separated flows. Physi cal models as well as prediction methods had to be developed based on detailed experi mental investigations. It was in accordance with the main concept of the research program that scientists working on problems of separated flows in different technical areas of application participated in this program. The following fields have been represented in the program: aerodynamics of wings and bodies, aerodynamics of auto mobiles, turbomachinery, ship hydrodynamics, hydraulics, internal flows, heat exchan gers, bio-fluid-dynamics, aerodynamics of buildings and structures. In order to concentrate on problems common in all those areas the emphasis of the program was on basic research dealing with generic geometric configurations showing the fundamental physical phenomena of separated flows. The engagement and enthusiasm of all participating scientists are highly appreciated. The program was organized such that all researchers met once a year to report on the progress of their work. Special thanks ought to go to Prof. E. A. Muller (Gottingen), Prof. H. Oertel jun. (Braunschweig), Dr. W. Schmidt (Dornier), Dr. H. -W. Stock (Dornier) and Dr. B. Wagner (Dornier), who had the functions of referees on those annual meetings.

Author : International Union of Theoretical and Applied Mechanics
Publisher : Cambridge University Press
Page : 394 pages
File Size : 55,6 Mb
Release : 1990-04-12
Category : Mathematics
ISBN : 0521381452

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Topological Fluid Mechanics by International Union of Theoretical and Applied Mechanics Pdf

There has been developing interest in the aspects of fluid mechanics and of magnetohydrodynamics that can be properly described as topological, rather than exclusively analytical in character. This book contains the proceedings of the IUTAM symposium on Topological Fluid Mechanics held at Cambridge UK, 13-18 August, 1989. Topics covered include the kinematic and dynamical problems in laminar and turbulent flows, as well as the range of problems that arise from the magnetohydrodynamics of highly conducting flows. The papers presented cover all approaches; theoretical, computational and experimental, and each paper has been edited by a member of the International Scientific Committee.

Author : Roy Wesley Henk,Stanford University. Thermosciences Division
Publisher : Unknown
Page : 228 pages
File Size : 48,7 Mb
Release : 1990
Category : Electronic
ISBN : STANFORD:36105046339623

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An Experimental Investigation of the Fluid Mechanics of an Unsteady, Three-dimensional Separation by Roy Wesley Henk,Stanford University. Thermosciences Division Pdf

Author : Taeyoung Han,Virendrakumar Chaturbhai Patel
Publisher : Unknown
Page : 86 pages
File Size : 51,6 Mb
Release : 1977
Category : Boundary layer
ISBN : UCR:31210018652063

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Flow-visualization of Three-dimensional Boundary-layer Separation on Bodies of Revolution at Incidence by Taeyoung Han,Virendrakumar Chaturbhai Patel Pdf

Surface streamline patterns on three bodies of revolution, namely a spheroid, a low-drag body and a hemisphere-hemispheroid combination body, have been examined at several angles of attack. Most of the tests were performed at low Reynolds numbers in a hydraulic flume using colored dye to make the surface flow visible. A limited number of experiments was also carried out in a wind tunnel, using wool tufts, to study the influence of Reynolds number and turbulent separation. The study has verified some of the important qualitative features of three-dimensional separation criteria proposed earlier by Maskell, Lighthill, Wang and others. The observed locations of laminar separation lines on a spheroid at various incidences have been compared with the numerical boundary-layer solutions of Wang, and it is suggested that the quantitative differences may be attributed to the significant viscous-inviscid interaction, especially at large incidences. (Author).

Author : Victor V. Kozlov,Alexander Dovgal
Publisher : Springer Science & Business Media
Page : 907 pages
File Size : 40,7 Mb
Release : 2012-12-06
Category : Science
ISBN : 9783642844478

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Separated Flows and Jets by Victor V. Kozlov,Alexander Dovgal Pdf

Separated flows and jets are closely linked in a variety of applications. They are of great importance in various fields of fluid mechanics including vehicle efficiency, technical branches concerned with gas/liquid flows, atmospheric effects on various constructions, etc. Knowledge of the physics of separated flows and jets and the development of reliable control techniques are prerequisite for future progress in the field. These aspects were in focus during the IUTAM-Symposium which was held in Novosibirsk, 9-13 July, 1990. This volume contains a selection of papers presenting recent results of theoretical and numerical studies as well as experimental work on separated flows and jets. The topics include sub- and supersonic, laminar and turbulent separation as well as organized structures in separated flows and jets. The reader will find here the state of the art and major trends for research in this field of aero-hydrodynamics.

Author : Ernst Heinrich Hirschel,Jean Cousteix,Wilhelm Kordulla
Publisher : Springer Science & Business Media
Page : 391 pages
File Size : 48,9 Mb
Release : 2013-10-29
Category : Technology & Engineering
ISBN : 9783642413780

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Three-Dimensional Attached Viscous Flow by Ernst Heinrich Hirschel,Jean Cousteix,Wilhelm Kordulla Pdf

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.

Author : Jie-Zhi Wu,Hui-yang Ma,M.-D. Zhou
Publisher : Springer Science & Business Media
Page : 776 pages
File Size : 48,9 Mb
Release : 2007-04-20
Category : Technology & Engineering
ISBN : 9783540290285

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Vorticity and Vortex Dynamics by Jie-Zhi Wu,Hui-yang Ma,M.-D. Zhou Pdf

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 dynamic process, by which one naturally identifies the content and scope of vorticity and vortex dynamics. This is followed by a detailed presentation of vorticity dynamics as the basis of later development. In vortex dynamics part the book deals with the formation, motion, interaction, stability, and breakdown of various vortices. Typical vortex structures are analyzed in laminar, transitional, and turbulent flows, including stratified and rotational fluids. Physical understanding of vertical 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. Material usually not seen in books on vortex dynamics is included, such as geophysical vortex dynamics, aerodynamic vortical flow diagnostics and management.

Author : Steven M. Harrington
Publisher : Unknown
Page : 318 pages
File Size : 51,9 Mb
Release : 1995
Category : Flow visualization
ISBN : UCSD:31822021269584

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Computational and Experimental Study of Three Dimensional Separated Flow Structure Over Prolate Spheroids by Steven M. Harrington Pdf

Author : Jonathan Craig Dutton,L. P. Purtell
Publisher : Unknown
Page : 232 pages
File Size : 53,5 Mb
Release : 1993
Category : Science
ISBN : UOM:39015029535328

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Separated Flows, 1993 by Jonathan Craig Dutton,L. P. Purtell Pdf

Author : V. De Brederode,Peter Bradshaw,Imperial College of Science and Technology
Publisher : Unknown
Page : 100 pages
File Size : 44,7 Mb
Release : 1972
Category : Flow visualization
ISBN : OCLC:12628779

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Three-dimensional Flow in Nominally Two-dimensional Separation Bubbles by V. De Brederode,Peter Bradshaw,Imperial College of Science and Technology Pdf