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Unsteady Three Dimensional Flow Separation
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722924379 Total Pages :50 pages Book Rating :4.9/5 (243 download)
Book Synopsis Unsteady Three-Dimensional Flow Separation by : National Aeronautics and Space Administration (NASA)
Download or read book Unsteady Three-Dimensional Flow Separation written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-15 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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...
Book Synopsis The Analysis of Unsteady Three-dimensional Flow Separation by : R. W. Henk
Download or read book The Analysis of Unsteady Three-dimensional Flow Separation written by R. W. Henk and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Separation of Flow by : Paul K. Chang
Download or read book Separation of Flow written by Paul K. Chang and published by Elsevier. This book was released on 2014-06-28 with total page 800 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722924447 Total Pages :32 pages Book Rating :4.9/5 (244 download)
Book Synopsis Unsteady Three-Dimensional Marginal Separation, Including Breakdown by : National Aeronautics and Space Administration (NASA)
Download or read book Unsteady Three-Dimensional Marginal Separation, Including Breakdown written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-15 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: A situation involving a three-dimensional marginal separation is considered, where a (steady) boundary layer flow is on the verge of separating at a point (located along a line of symmetry/centerline). At this point, a triple-deck is included, thereby permitting a small amount of interaction to occur. Unsteadiness is included within this interaction region through some external means. It is shown that the problem reduces to the solution of a nonlinear, unsteady, partial-integro system, which is solved numerically by means of time-marching together with a pseudo-spectral method spatially. A number of solutions to this system are presented which strongly suggest a breakdown of this system may occur, at a finite spatial position, at a finite time. The structure and details of this breakdown are then described. Duck, Peter W. Glenn Research Center NASA ORDER C-99066-G; RTOP 505-62-21...
Book Synopsis An Experimental Investigation of the Fluid Mechanics of an Unsteady, Three-dimensional Separation by : Roy Wesley Henk
Download or read book An Experimental Investigation of the Fluid Mechanics of an Unsteady, Three-dimensional Separation written by Roy Wesley Henk and published by . This book was released on 1990 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fluid Dynamics of Unsteady, Three-dimensional and Separated Flows by : Francis J. Marshall
Download or read book Fluid Dynamics of Unsteady, Three-dimensional and Separated Flows written by Francis J. Marshall and published by . This book was released on 1971 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Unsteady Three-dimensional Cross Flow Separation Measurements on a Prolate Spheroid Undergoing Time-dependent Maneuvers by : Todd G. Wetzel
Download or read book Unsteady Three-dimensional Cross Flow Separation Measurements on a Prolate Spheroid Undergoing Time-dependent Maneuvers written by Todd G. Wetzel and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nonlinear Dynamics and Control of Three-dimensional Separated Flows by : George Haller
Download or read book Nonlinear Dynamics and Control of Three-dimensional Separated Flows written by George Haller and published by . This book was released on 2009 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Our objective in this project was to derive a mathematically exact theory of unsteady fluid flow separation. We have obtained analytic formulae for the location and shape of separation profiles in terms of measurable, wall-based physical quantities. These formulae can now be used to design feedback controllers that alter, destroy, or create separation. Our main achievements are as follows: (1) We have developed a mathematical theory of unsteady three-dimensional separation for flows with a steady mean component. (2) We have developed a theory of moving unsteady separation for flows with a time-varying mean component. (3) We have developed a theory of separation for two-dimensional flows with a slip boundary ((1)-(3) above cover no-slip boundaries) (4) We also conducted experiments to prove existence of a new three-dimensional separation pattern (separation along a limit cycle of the wall shear field) first predicted by our 3D steady separation theory.
Book Synopsis Three-dimensional Separated Flow Topology by : Jean Délery
Download or read book Three-dimensional Separated Flow Topology written by Jean Délery and published by John Wiley & Sons. This book was released on 2013-02-28 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Forum on Unsteady Flow Separation by : Kirti N. Ghia
Download or read book Forum on Unsteady Flow Separation written by Kirti N. Ghia and published by . This book was released on 1987 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Computation of Navier-Stokes Equations for Three-dimensional Flow Separation by :
Download or read book Computation of Navier-Stokes Equations for Three-dimensional Flow Separation written by and published by . This book was released on 1989 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Visualization of Three-Dimensional Forced Unsteady Separated Flow by : M. Robinson
Download or read book Visualization of Three-Dimensional Forced Unsteady Separated Flow written by M. Robinson and published by . This book was released on 1986 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three-dimensional unsteady flow separation was visualized for a semi-infinite span wing pitched upward at a constant rate from 0 to 60 deg angles of attack. Initially, many of the same complex flow perturbations, including the formation of leading and trailing edge vortices observed from two-dimensional flow separation were evident. Using the semi-infinite wing, the flow field was further complicated by a wing tip vortex that developed orthogonal to the separation induced leading and trailing edge vortices. The tip flow distorted the development of the initially two-dimensional inboard, leading edge vortex. The simple pitching motion history permitted resolution of the development of individual vortices as a function of airfoil motion parameters. Also, vortex-vortex interactions were examined between separation-induced vortices and wingtip vortices. The interactions were characterized for time periods that extended well beyond the actual pitching motions. (Author).
Book Synopsis On Three-dimensional Flow Separation Criteria by : T. C. Tai
Download or read book On Three-dimensional Flow Separation Criteria written by T. C. Tai and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (France) Publisher : ISBN 13 : Total Pages :247 pages Book Rating :4.:/5 (227 download)
Book Synopsis Three Dimensional and Unsteady Separation at High Reynolds Numbers by : ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (France)
Download or read book Three Dimensional and Unsteady Separation at High Reynolds Numbers written by ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (France) and published by . This book was released on 1978 with total page 247 pages. Available in PDF, EPUB and Kindle. Book excerpt: These articles cover two major aspects of the topic: the physics of flow separation and reattachment, with particular reference to turbulent flows, and a consideration of some practically important types of separated flows which occur in aeronautics. Under both headings articles are included on the most recent experimental work, computational techniques and prediction methods, and an attempt is made to assess progress and to identify those areas in which further work should be done. Although attention is not confined to incompressible flows, only passing reference is made to shock-wave boundary layer interaction.
Book Synopsis Numerical Investigation of Three-dimensional Flow Separation by : Yong-Sun Wie
Download or read book Numerical Investigation of Three-dimensional Flow Separation written by Yong-Sun Wie and published by . This book was released on 1987 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nonlinear Dynamics of 3D Fluid Flow Separation by : Amit Surana
Download or read book Nonlinear Dynamics of 3D Fluid Flow Separation written by Amit Surana and published by . This book was released on 2007 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flow separation (the detachment of fluid from a no-slip boundary) is a major cause of performance loss in engineering devices, including diffusers, airfoils and jet engines. The systematic study of flow separation dates back to the seminal work of Prandtl in 1904. He showed that a two-dimensional steady flow separates from a no-slip boundary at points where the wall shear vanishes and admits a negative gradient. Three-dimensional flows, however, tend to separate along lines, as opposed to isolated wall-shear zeros. Despite widespread effort, no generally applicable extension of Prandtl's result has emerged for even three-dimensional steady flows. In this thesis we develop a nonlinear theory for separation and attachment of steady and unsteady three-dimensional fluid flows on no-slip curved moving boundaries. The theory provides analytic criteria for locating the separation line and approximating the shape of separation surface. Based on nonlinear dynamical systems techniques, the criteria identify separation line and separation surface by locating nonhyperbolic unstable manifolds that collect and eject fluid particles from the boundary. We verify our theory on analytic flow models, in numerical simulations of important benchmark problems and in experiments. Our theory provides a systematic tool for diagnostics, configuration design and active flow control of separation and attachment in complex three dimensional fluid flows.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722904029 Total Pages :34 pages Book Rating :4.9/5 (4 download)
Book Synopsis Three-Dimensional Marginal Separation by : National Aeronautics and Space Administration (NASA)
Download or read book Three-Dimensional Marginal Separation written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-13 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: The three dimensional marginal separation of a boundary layer along a line of symmetry is considered. The key equation governing the displacement function is derived, and found to be a nonlinear integral equation in two space variables. This is solved iteratively using a pseudo-spectral approach, based partly in double Fourier space, and partly in physical space. Qualitatively, the results are similar to previously reported two dimensional results (which are also computed to test the accuracy of the numerical scheme); however quantitatively the three dimensional results are much different. Duck, Peter W. Glenn Research Center SAA-C99066G; RTOP 505-62-21...
