Results 261 to 270 of about 63,038 (316)

Stability of Laminar Boundary Layers at Separation

The Physics of Fluids, 1967
The stability of laminar boundary layers at separation is considered. The velocity distribution is represented by (1) a Pohlhausen fourth-degree polynomial P4, and (2) by a Falkner—Skan similarity profile at separation, Hartree β = − 0. 1988. The Orr—Sommerfeld equation is integrated using Runge—Kutta with Gram—Schmidt orthonormalization.
Wazzan, A. R., Okamura, T. T., Smith, A. M. O.   +2 more
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Boundary-Layer Separation From Downstream Moving Boundaries

Journal of Applied Mechanics, 1973
The laminar boundary-layer equations for incompressible flow with a mild adverse pressure gradient were numerically solved for flows over downstream moving boundaries. It was demonstrated that the vanishing of skin friction in this case is not related to separation.2 Indeed the integration proceeds smoothly through a point of vanishing skin friction ...
Telionis, D. P., Werle, M. J.
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Control of a boundary layer separation

PAMM, 2007
AbstractThe results of experimental study on a boundary layer separation control are given in the paper. The boundary layer on a flat wall is subjected to adverse pressure gradient. The active control strategy evolving a synthetic jet has been applied. The separation process is investigated using TR‐PIV method.
V. Uruba, M. Knob, L. Popelka
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Measurements in separating boundary layers

AIAA Journal, 1989
In this paper we describe the application of pulsed-wire anemometry to the study of a two-dimensional separated flow generated by imposing a suitably adverse pressure gradient on a flat plate turbulent boundary layer. Accurate measurements of both mean velocity right down to the wall and skin friction have been made throughout the region approaching ...
M. Dianat, I. P. Castro
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Turbulence in a separated boundary layer

Journal of Fluid Mechanics, 1991
This paper presents and discusses the results of an extensive experimental investigation of a flat-plate turbulent boundary subjected to an adverse pressure gradient sufficiently strong to lead to the formation of a large separated region. The pressure gradient was produced by applying strong suction through a porous cylinder fitted with a rear flap ...
M. Dianat, Ian P. Castro
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Boundary layers and separation

1966
We consider two-dimensional stationary viscous incompressible flow past a finite object. It is assumed that for each value of the Reynolds number a solution exists; it is also assumed that if this solution is not unique it is possible in principle to select a solution which varies continuously with Reynolds number.
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Transition in a Separated Laminar Boundary Layer

Journal of the Aerospace Sciences, 1960
PROGRESS in understanding the mechanism of transition from laminar to turbulent flow in a boundary layer has been largely confined to flow along a flat plate. The present investigation is concerned with transition in a separated laminar boundary layer. A hot wire investigation of flow near the short leading-edge bubble on a RAE-103 airfoil section led ...
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Instability of separated boundary layers

2012
In this chapter we discuss flow instability at laminar boundary-layer separation that can happen on airfoils and wings, in diffusors, at sudden surface variations such as steps and bumps, etc. Within this topic, a good deal of research data is available for local separation regions generated when the separated layer reattaches back to the surface. Such
Andrey V. Boiko, Alexander V. Dovgal, Genrih R. Grek, Victor V. Kozlov   +3 more
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On laminar boundary-layer separation

12th Aerospace Sciences Meeting, 1974
Iterative finite-difference techniques are developed for integrating the boundary-layer equations, without approximation, through a region of reversed flow. The numerical procedures are used to calculate incompressible laminar separated flows and to investigate the conditions for regular behavior at the point of separation.
J. KLINEBERG, J. STEGER
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Turbulent Boundary-Layer Separation

Annual Review of Fluid Mechanics, 1989
This article summarizes our present understanding of the physical behavior of two-dimensional turbulent separated flows, which occur due to adverse pressure gradients around streamlined and bluff bodies. The physical behavior of turbulence is flow dependent, so detailed experimental infor­ mation is needed for understanding such flows and modeling ...
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