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Unsteady Separation Phenomena In Two And Three Dimensional Boundary Layer Flows
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Book Synopsis Unsteady Separation Phenomena in Two-and Three-dimensional Boundary-layer Flows by : Chi Young Kim
Download or read book Unsteady Separation Phenomena in Two-and Three-dimensional Boundary-layer Flows written by Chi Young Kim and published by . This book was released on 1999 with total page 686 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research is a computational study of unsteady boundary-layer separations from the leading nose region of a two-dimensional pitching airfoil placed in a uniform flow stream and from an infinite plate over which a three-dimensional vortex is placed in an external mainstream. Here, the flows are considered to be of large Reynolds numbers so that the limiting case Re → infinity is considered.
Book Synopsis Unsteady three-dimensional effects in marginally separated laminar boundary layer flows by : Stefan Braun
Download or read book Unsteady three-dimensional effects in marginally separated laminar boundary layer flows written by Stefan Braun and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Two-Dimensional Separated Flows by : S. M. Belotserkovsky
Download or read book Two-Dimensional Separated Flows written by S. M. Belotserkovsky and published by CRC Press. This book was released on 1992-11-30 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-Dimensional Separated Flows provides a systematic presentation of the theory of separated flow around bodies. The main classes of aerodynamic problems of plane-parallel flow around bodies are described, and the steady aerodynamic, unsteady aerodynamic, and statistical characteristics of a trailing wake are determined. Numerical methods based on the synthesis of models for non-viscous incompressible flow and boundary layer, algorithms, examples, and systematic comparisons are presented. The book also includes numerical results for the problem of separated flow around fixed, oscillating, and rotating cylinders, in addition to results for separated flow around an aerofoil over a wide range of angles. Two-Dimensional Separated Flows will benefit researchers and students studying aerodynamics, aircraft dynamics, aeroelasticity, and the aerodynamics of building structures.
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 Laminar and Turbulent Separation Including Three-dimensional Effects by : Von Karman Institute for Fluid Dynamics
Download or read book Laminar and Turbulent Separation Including Three-dimensional Effects written by Von Karman Institute for Fluid Dynamics and published by . This book was released on 1974 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Boundary-Layer Separation by : Frank T. Smith
Download or read book Boundary-Layer Separation written by Frank T. Smith and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 403 pages. Available in PDF, EPUB and Kindle. Book excerpt: The IUTAM Symposium on Boundary-Layer Separation, suggested by the UK National Committee of Theoretical and Applied Mechanics and supported by the International Union of Theoretical and Applied Mechanics, was held at University College London on August 26-28, 1986. The proposed theme and scope of the Symposium were designed to help to bring about the necessary interaction between experimentalists, computationalists and theoreticians for the furthering of understanding in this challenging subject. The talks and discussions were aimed at representing the very wide range and application of separating-flow phenomena, which often substantially affect the whole of fluid dynamics at medium to large Reynolds numbers, covering in particular both laminar and turbulent flow, steady or unsteady, two- or three-dimensional, small or large-scale, incompressible or compressible, external or internal, from the experimental, computational and theoretical standpoints. It was intended that about 80 scientists would participate in the Symposium, with about 25 talks being delivered, to which poster sessions with 8 contributions were added subsequently. All the speakers and poster presenters were selected by the scientific committee, although two late replacements of speakers were required. Fruitful discussions, well led by the session chairmen, took place formally after each talk and after the poster sessions and informally on other occasions including the social events. The present proceedings of the Symposium appear to reflect much of the current state of experimental, computational and theoretical work and progress in boundary-layer separation. We hope that they provide also ideas, questions and stimulation, in addition to major recent developments.
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 Boundary-layer Separation by : Demetri P. Telionis
Download or read book Boundary-layer Separation written by Demetri P. Telionis and published by . This book was released on 1970 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: The phenomenon of separation is one of the most critical features of the flow of viscous fluids about rigid bodies. In the two-dimensional steady-state case, Prandtl's criterion (vanishing of skin friction) appears to be successful in predicting separation. Numerical integrations have indicated that the boundary-layer equations behave singularly at separation, and Goldstein has suggested analytical formulas describing this situation. Prandtl's criterion fails to predict meaningful separation for unsteady problems and this seems to have been mostly unnoticed. A general and formal definition of 'boundary-layer separation' is given, based on the concept of Goldstein's singularity. It is demonstrated how from this definition one can deduce meaningful criteria for the unsteady problem as well as other complicated cases, such as three-dimensional or compressible separation flow. A simple formula is suggested for the component of the velocity in the direction parallel to the wall; and it is demonstrated that this is in agreement with Goldstein's results for small distance from separation along the wall. A differential equation is derived from the momentum equation which contains the velocity profile at separation. A few applications are included, demonstrating solutions of this equation, which, in the unsteady case, contains the velocity of the phenomenon of separation too.
Book Synopsis Development of Boundary Layers and Separation Patterns on a Body of Revolution at Incidence by : H. U. Meier
Download or read book Development of Boundary Layers and Separation Patterns on a Body of Revolution at Incidence written by H. U. Meier and published by . This book was released on 1982 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Detailed measurements in three-dimensional boundary layers and separated flow fields, developing on a prolate spheroid, are presented. The discussion is concentrated on the possible topological structure of separation patterns resulting from laminar or turbulent boundary layer flows. A hypothesis about the transition from an unsteady two-dimensional axisymmetric flow separation into a steady three-dimensional vortex flow is established. (Author).
Book Synopsis Physics of Transitional Shear Flows by : Andrey V. Boiko
Download or read book Physics of Transitional Shear Flows written by Andrey V. Boiko and published by Springer Science & Business Media. This book was released on 2011-09-15 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: Starting from fundamentals of classical stability theory, an overview is given of the transition phenomena in subsonic, wall-bounded shear flows. At first, the consideration focuses on elementary small-amplitude velocity perturbations of laminar shear layers, i.e. instability waves, in the simplest canonical configurations of a plane channel flow and a flat-plate boundary layer. Then the linear stability problem is expanded to include the effects of pressure gradients, flow curvature, boundary-layer separation, wall compliance, etc. related to applications. Beyond the amplification of instability waves is the non-modal growth of local stationary and non-stationary shear flow perturbations which are discussed as well. The volume continues with the key aspect of the transition process, that is, receptivity of convectively unstable shear layers to external perturbations, summarizing main paths of the excitation of laminar flow disturbances. The remainder of the book addresses the instability phenomena found at late stages of transition. These include secondary instabilities and nonlinear features of boundary-layer perturbations that lead to the final breakdown to turbulence. Thus, the reader is provided with a step-by-step approach that covers the milestones and recent advances in the laminar-turbulent transition. Special aspects of instability and transition are discussed through the book and are intended for research scientists, while the main target of the book is the student in the fundamentals of fluid mechanics. Computational guides, recommended exercises, and PowerPoint multimedia notes based on results of real scientific experiments supplement the monograph. These are especially helpful for the neophyte to obtain a solid foundation in hydrodynamic stability. To access the supplementary material go to extras.springer.com and type in the ISBN for this volume.
Book Synopsis Unsteady Symmetry-Plane Boundary Layer and 3-D Unsteady Separation. Part I. High Incidence by : K. C. Wang
Download or read book Unsteady Symmetry-Plane Boundary Layer and 3-D Unsteady Separation. Part I. High Incidence written by K. C. Wang and published by . This book was released on 1982 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: The symmetry-plane laminar boundary layer of an impulsively-started ellipsoid of revolution at high incidence is solved to shed light on some basic characteristics of three dimensional, unsteady flows. The governing equations are formally similar to those for the 3-dimensional, steady case, so the same method of solution and computer programs previously developed were employed in the present work. The most important result obtained is concerned with the meridional skin friction c(fu). The zero-c(fu) point (at which c(fu) vanishes) does not, as expected, move forward as time increases, instead it remains over the rear body. As t approaches infinity, it jumps to the front nose. This implies that there is no flow separation over the symmetry-plane at finite times. In the meanwhile, it is argued that separation must occur on two sides of the body. This situation leads us to propose a new unsteady separation sequence, i.e. an open type separation prevails at earlier times, while a closed type of separation occurs only at the steady-state condition. This sequence presents a sharp contrast to the conventional notion of unsteady separation which consists of a series of closed separations only. Furthermore, this sequence with the time as the parameter is found to be similar to that for previously-studied steady flows with varying incidences. (Author).
Book Synopsis Wall Temperature Effects on Two- and Three-dimensional Transonic Turbulent Boundary Layers by : J. C Adams (Jr.)
Download or read book Wall Temperature Effects on Two- and Three-dimensional Transonic Turbulent Boundary Layers written by J. C Adams (Jr.) and published by . This book was released on 1973 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wall temperature effects on two- and three-dimensional high Reynolds number turbulent boundary layers are examined for representative high Reynolds number tunnel (HIRT) conditions relative to flight; also considered are hot-wall conditions relative to space shuttle subsonic and transonic flight during earth entry. Results show significant influences of wall-to-stagnation temperature ratio on the location of boundary-layer separation and the friction drag coefficient. The study also indicates how rapid model wall temperature during a typical testing period of 2 to 10 sec may be undesirable for HIRT testing since unsteady aerodynamic phenomena can be influenced by rapidly changing turbulent boundary-layer wall temperature levels. (Modified author abstract).
Book Synopsis Boundary Layer Research by : International Union of Theoretical and Applied Mechanics
Download or read book Boundary Layer Research written by International Union of Theoretical and Applied Mechanics and published by . This book was released on 1958 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Unsteady Turbulent Shear Flows by : R. Michel
Download or read book Unsteady Turbulent Shear Flows written by R. Michel and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: It was on a proposal from the "Comite National Fran.
Book Synopsis Three Dimensional Interactions in High Speed Boundary Layer Flows by : George R. Inger
Download or read book Three Dimensional Interactions in High Speed Boundary Layer Flows written by George R. Inger and published by . This book was released on 1985 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this research is the basic theoretical investigation of three-dimensional pressure, skin friction, and heat transfer disturbances in both laminar and turbulent boundary layer flows including viscous-inviscid interaction effects, separation, and reattachment. A sound understanding of these phenomena is required in modern aerodynamic design analyses of high-speed flight vehicles. The primary emphasis in these studies has been to seek a basic physical understanding of the underlying fluid behavior by means of analytically-oriented methods; in this way, the results can be used to guide and interpret concurrent experimental and computationally-oriented investigations. This inquiry has focused on two parallel paths of investigation: three-dimensional, viscous-inviscid interaction phenomena within turbulent boundary layers in supersonic flow due to impinging swept shock and/or 3-D surface deflections, and streamwise vortex-disturbance mechanisms within laminar or turbulent boundary layers that are either separated or attached.
Book Synopsis Separated Flows by : Odus R. Burggraf
Download or read book Separated Flows written by Odus R. Burggraf and published by . This book was released on 1986 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report contains a study of separation of three-dimensional steady flows and two-dimensional unsteady flows. During this reporting period, an analytical model of the laminar separation region in supersonic flow at high Reynolds number was formulated and shown to be in reasonable agreement with experimental results. The model gives scaling laws for the flow properties and length scales for the separation region. It was also shown that triple-deck theory is the valid limit for high Reynolds-number flows involving laminar separation and reattachment, on the basis of interacting boundary-layer theory. Another analysis demonstrated the nature of the flow near an abrupt change of surface height, such as steps and bases. Unsteady effects on three-dimensional boundary layers at large Reynolds number were analyzed and were found to fall into three distinct regimes of frequency parameter, based on triple-deck arguments. Algorithms were developed to treat separated flow problems, avoiding the difficulty of the separation singularity by use of time-marching in one case, and using a spectral method in the other case. Results have been obtained for both two and three-dimensional flows involving relatively large regions of separation.
Book Synopsis Shock Wave-Boundary-Layer Interactions by : Holger Babinsky
Download or read book Shock Wave-Boundary-Layer Interactions written by Holger Babinsky and published by Cambridge University Press. This book was released on 2011-09-12 with total page 481 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shock wave-boundary-layer interaction (SBLI) is a fundamental phenomenon in gas dynamics that is observed in many practical situations, ranging from transonic aircraft wings to hypersonic vehicles and engines. SBLIs have the potential to pose serious problems in a flowfield; hence they often prove to be a critical - or even design limiting - issue for many aerospace applications. This is the first book devoted solely to a comprehensive, state-of-the-art explanation of this phenomenon. It includes a description of the basic fluid mechanics of SBLIs plus contributions from leading international experts who share their insight into their physics and the impact they have in practical flow situations. This book is for practitioners and graduate students in aerodynamics who wish to familiarize themselves with all aspects of SBLI flows. It is a valuable resource for specialists because it compiles experimental, computational and theoretical knowledge in one place.
