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3 edition of Vortex instabilities in 3D boundary layers found in the catalog.

Vortex instabilities in 3D boundary layers

Vortex instabilities in 3D boundary layers

the relationship between Görtler and crossflow vortices

  • 256 Want to read
  • 5 Currently reading

Published by Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, National Technical Information Service, distributor in Hampton, VA, [Springfield, Va .
Written in English

    Subjects:
  • Boundary layer stability.,
  • Cross flow.,
  • Goertler instability.,
  • Swept wings.,
  • Vortices.

  • Edition Notes

    StatementAndrew P. Bassom nad Philip Hall.
    SeriesICASE report -- no. 90-72., NASA contractor report -- 187456., NASA contractor report -- NASA CR-187456.
    ContributionsHall, Philip., Institute for Computer Applications in Science and Engineering.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15405797M

    The Oceanic Boundary Layer (OBL) •Planetary Boundary Layers •The OBL •Surface Forcing and Similarity Theory •The Convective OBL •Turbulence closures Modeling and parameterizing ocean planetary boundary layers. In OCEAN MODELING AND PARAMETERIZATION, E.P. Chassignet and J. Verron (Eds.) Kluwer, File Size: KB. American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA

    Cross-Flow Instability of 3D Boundary Layers on a Flat Plate.- Experiments on Swept-Wing Boundary Layers.- Poster Session On the Stability of Swept Wing Laminar Boundary Layers Including Curvature Effects.- An Investigation of the Non-linear Instability of Flow near a Swept Attachment-Line.- Time dependent Instabilities of Rayleigh-Benard. Extensive combined experimental and theoretical investigations of the linear evolution of unsteady (in general) Cross-Flow (CF) and three-dimensional (3D) Tollmien-Schlichting (TS) instability mode Cited by: 1.

    This text is the translation and revision of Schlichting's classic text in boundary layer theory. The main areas covered are laws of motion for a viscous fluid, laminar boundary layers, transition and turbulence, and turbulent boundary layers.5/5(1).   A new edition of the almost legendary textbook by Schlichting completely revised by Klaus Gersten is now available. This book presents a comprehensive overview of boundary-layer theory and its application to all areas of fluid mechanics, with emphasis on the flow past bodies (e.g. aircraft aerodynamics). It contains the latest knowledge of the subject based on a thorough review of the /5(14).


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Vortex instabilities in 3D boundary layers Download PDF EPUB FB2

Get this from a library. Vortex instabilities in 3D boundary layers: the relationship between Görtler and crossflow vortices. [Andrew P Bassom; Philip Hall; Institute for. Boundary layer theory shows that the vortex regimes strongly depend on the theoretical radial volume flux through the bottom boundary layer under a potential vortex: when the ratio of Q to the.

Some discussion of the receptivity problem for vortex instabilities in weakly three-dimensional boundary layers is given; it is shown that inviscid modes have a coupling coefficient marginally smaller than those of the fastest growing viscous modes discussed recently by Denier, Hall & Seddougui ().

Abstract. One of the routes to transition consists of a cascade of successive instabilities. The first instability is usually called primary instability and it may consist of a two- or three-dimensional Tollmien Schlichting wave, a Gortler vortex, or a crossflow by: 5.

In physics and fluid mechanics, a boundary layer is the layer of fluid in the immediate vicinity of a bounding surface where the effects of viscosity are significant. As the fluid moves past the object, the molecules right next to the surface stic.

Secondary instabilities of Görtler vortices in Vortex instabilities in 3D boundary layers book boundary layer flows Transitions occur through successive supercritical Hopf bifurcations in the boundary layers.

A 3D instability. Blackaby, N.D. & Choudhari, M. Inviscid vortex motions in weakly three-dimensional boundary layers and their relation with instabilities in stratified shear flows.

Proc. Soc. Lond. A.,– ADS zbMATH CrossRef Google ScholarCited by: 1. Spatially Developing Secondary Instabilities in Compressible Swept Airfoil Boundary Layers Fei Li and Meelan M. Choudhari NASA Langley Research Center, Hampton, VA Two-dimensional eigenvalue analysis is used on a massive scale to study spatial instabilities of compressible shear flows with two inhomogeneous directions.

Vortex organization in the outer region of the turbulent boundary layer - Volume - R. ADRIAN, C. MEINHART, C. TOMKINSCited by: A. Validation of Secondary Instability Predictions for Flat Plate Boundary Layers Secondary instability of second mode instabilities was first studied by Ng and Erlebacher[2] for a Mach boundary layer with adiabatic wall.

When the spatial growth rate of the primary second mode disturbance isFile Size: KB. The hybrid vortex filament scheme employed in simulating the boundary layer flow is the same as has been previously described in detail It combines a finite volume solution to the full viscous vorticity equation on a thin prismatic mesh adjacent to the wall surface with a vortex filament calculation away from the boundaries.

A new edition of the almost legendary textbook by Schlichting completely revised by Klaus Gersten is now available. This book presents a comprehensive overview of boundary-layer theory and its application to all areas of fluid mechanics, with emphasis on /5.

Smith, “ A synthesized model of the near-wall behavior in turbulent boundary layers,” in Proceedings of the 8th Symposium on Turbulence, edited by J. Zakin and G. Patterson (University of Missouri-Rolla, ), pp. – describes both the kinematics and dynamics of hairpin vortices and their relationships to low-speed streaks, the.

A theoretical study is presented of three-dimensional turbulent flow provoked in a boundary layer by an array of low-profile vortex generators (VGs) on the surface.

The typical VG sits in the logarithmic region of the incident boundary layer, and the turbulence model used seems representative in this by: Boundary layer instabilities in mixed convection and di usion ames with an unheated starting length Colin H. Miller a, Wei Tang, Evan Sluder, Mark A.

Finneyb, Sara S. McAllister b, Jason M. Forthofer, Michael J. Gollnera, aUniversity of Maryland Department of Fire Protection Engineering Stadium Dr. turbulent boundary layers. Finally, some conclusions are drawn. Numerical Method Various aspects of the numerical simulation technique are now described with the greatest emphasis placed on the near-wall treatment.

Additional information about the vortex filament meth-odology can be found in the literature [4,5,9]. Vortex Tubes. Boundary-Layer Stability and Transition W. Saric Arizona State University Tempe, USA Abstract Within the last five years, increased emphasis on secondary instability analysis along with the experimental observations of subharmonic instabilities have changed the picture of the transition process for boundary layers in low-disturbance.

Boundary layer effects play a very important part in determining the drag for the aircraft. Thus, the wing should be designed to minimize the drag.

the boundary layer. The boundary layer is a very thin layer of air flowing over the surface of an aircraft wing, or airfoil, (as well as other surfaces of the aircraft). title = "Characteristics of vortex packets in turbulent boundary layers", abstract = "Stereoscopic particle image velocimetry (PIV) was used to measure all three instantaneous components of the velocity field in streamwise-spanwise planes of a turbulent boundary layer at Reτ = (Reθ = ).Cited by: @article{osti_, title = {Experimental investigation of sound generation by a protuberance in a laminar boundary layer}, author = {Kobayashi, M.

and Asai, M. and Inasawa, A.}, abstractNote = {Sound radiation from a two-dimensional protuberance glued on the wall in a laminar boundary layer was investigated experimentally at low Mach numbers.

Indeed, physically, the departure of a vortex from the wall suggests that vorticity within the boundary layer is no longer fixed on the cone surface, but is instead propagating or travelling in the effective velocity x ˆ-direction. Ultimately, in order to confirm whether travelling Author: Zahir Hussain.Boundary layer, in fluid mechanics, this layer of a flowing gas or liquid in contact with a surface such as that of an airplane wing or of the inside of a pipe.

The fluid in the boundary layer is subjected to shearing forces. Learn more about boundary layers in this article.In contrast, the quasiparallel predictions are found to result in severe underprediction of the N-factors.

The direct numerical simulations also indicate that the breakdown of secondary instabilities in a 3D hypersonic boundary layer shares certain common features with the previous computations of crossflow transition over subsonic swept by: 3.