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:
Download or read book Unsteady Boundary Layer Separation written by Leonard Louis Van Dommelen and published by . This book was released on 1981 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Unsteady Boundary Layer Separation written by K. C. Wang and published by . This book was released on 1979 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new separation criterion for two-dimensional unsteady boundary layers is proposed here. This criterion is derived by analogy, from its counterpart for steady, three-dimensional boundary layer. Analogous limiting streamlines for the unsteady, two-dimensional case are first defined, and an envelope of these streamlines is used to signify unsteady separation. To demonstrate this procedure, two previously studied problems are recalculated here. These are the unsteady responses to (1) a sudden change in velocity in Howarth's problem, and (2) an impulsively-started circular cylinder. Our conclusion regarding separation for the cylinder problem disagrees with that of the Telionis and Tsahalis based on the singularity criterion, but appears to be consistent with the prediction of Proudman and Johnson. Finally, we propose a three-dimensional, unsteady separation criterion on the basis of repeated applications of either the steady, three-dimensional separation criterion at successive times or the unsteady, two-dimensional separation criteion at fixed coordinate planes. (Author).
Download or read book A Numerical Study of Unsteady Laminar Boundary Layer Separation written by Laura Lynn Pauley and published by . This book was released on 1988 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: The unsteady, incompressible Navier-Stokes equations were solved using a fractional timestep method. Using this technique, the separation of a laminar boundary layer under the influence of an external adverse pressure gradient was.
Download or read book Unsteady Boundary Layer Separation written by Konstantin E. Zalutsky and published by . This book was released on 2000 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: The unsteady inviscid motion is constructed for an airfoil undergoing a maneuver on the basis of thin airfoil theory, wherein the airfoil is thin and the flow perturbations at any stage are small (with respect to the uniform flow).
Download or read book On the Lagrangian Description of Unsteady Boundary Layer Separation Part 1 General Theory written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-10-25 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although unsteady, high-Reynolds number, laminar boundary layers have conventionally been studied in terms of Eulerian coordinates, a Lagrangian approach may have significant analytical and computational advantages. In Lagrangian coordinates the classical boundary layer equations decouple into a momentum equation for the motion parallel to the boundary, and a hyperbolic continuity equation (essentially a conserved Jacobian) for the motion normal to the boundary. The momentum equations, plus the energy equation if the flow is compressible, can be solved independently of the continuity equation. Unsteady separation occurs when the continuity equation becomes singular as a result of touching characteristics, the condition for which can be expressed in terms of the solution of the momentum equations. The solutions to the momentum and energy equations remain regular. Asymptotic structures for a number of unsteady 3-D separating flows follow and depend on the symmetry properties of the flow. In the absence of any symmetry, the singularity structure just prior to separation is found to be quasi 2-D with a displacement thickness in the form of a crescent shaped ridge. Physically the singularities can be understood in terms of the behavior of a fluid element inside the boundary layer which contracts in a direction parallel to the boundary and expands normal to it, thus forcing the fluid above it to be ejected from the boundary layer. Vandommelen, Leon L. and Cowley, Stephen J. Glenn Research Center NASA-SAA-C-99066-G; RTOP 505-62-21...
Download or read book Numerical Studies of Unsteady Laminar Boundary layer Separation Over Impulsively started Moving Objects written by Tzuyin Wu and published by . This book was released on 1991 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Investigation of Unsteady Boundary layer Separation written by Demetri P. Telionis and published by . This book was released on 1972 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: It has been previously indicated both theoretically and experimentally that for steady flow over moving boundaries, the vanishing of skin friction does not mean separation and that separation occurs at a station where the generalized Moore-Rott-Sears (MRS) criterion is satisfied. The authors have earlier indicated numerically that the Goldstein-type separation-singularity appears at the point where the MRS criterion is satisfied. In the present paper and in accordance with the theoretical work of Sears and one of the authors, this idea is extended to unsteady flows. A Goldstein-type of a traveling singularity is discovered and interpreted as 'unsteady boundary-layer separation.' The features of the flow in the neighborhood of this singularity are investigated. (Author).
Download or read book A Study of Boundary Layer Control for Unsteady Separation Using Lagrangian Method written by Kazutoshi Tominaga and published by . This book was released on 1992 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book On the Lagrangian Description of Unsteady Boundary Layer Separation written by Leon L. Van Dommelen and published by . This book was released on 1989 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Unsteady Incompressible Boundary layer Separation Over a Two Dimensional Impulsively Started Elliptic Cylinder Calculated by Lagrangian Method written by Tzuyin Wu and published by . This book was released on 1985 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
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.
Download or read book The Prediction of Turbulent Boundary layer Separation Influenced by Blowing written by Arnold Polak and published by . This book was released on 1971 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report presents an analysis predicting separation of a turbulent boundary layer over a cone-flare configuration with gas injected into the boundary layer ahead of separation point. Separation location and separation lengths are compared with experimental data obtained at Mach number of 6 and a range of Reynolds numbers. At the highest Reynolds numbers the extent of separation decreases with increasing Reynolds number. When compared to separation over cylinder-flare body it is found that the extent of separation is lower for the cone-flare configuration. (Author).
Download or read book The Boundary layer Separation Singularity in Steady and Unsteady Flows written by Demosthenes Theodoros Tsahalis and published by . This book was released on 1972 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Investigation of Unsteady Boundary layer Separation by D P Telionis D Th Tsahalis and M J Werle written by Demetri P. Telionis and published by . This book was released on 1972 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
