Results 251 to 260 of about 454,024 (311)

Note on Unsteady Boundary-Layer Separation

AIAA Journal, 1974
turbulent. It was assumed that in this case, the aft microphone gave a more realistic representation of the acoustic environment. In addition, it was assumed that the disturbance function Z was comprised solelv of acoustic disturbances. A plot of transition data obtained in the AEDC 16T as a function of acoustic level is shown in Fig. 3.
Williams, James C. III, Johnson, W. Donald   +1 more
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Boundary-Layer Separation in Unsteady Flow

SIAM Journal on Applied Mathematics, 1975
Extension of the familiar concept of boundary-layer separation to flow along moving walls and unsteady flows is a subject that attracted some interest in the 1950’s and has been investigated further in the past few years. The well-known criterion of vanishing wall-shear does not apply in such flows, and therefore the definition of the phenomenon ...
Sears, W. R., Telionis, D. P.
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Prediction of Turbulent Separated Boundary Layers

AIAA Journal, 1973
Theme A integral boundary-layer method is extended to calculation of separated turbulent boundary layers by treating the pressure as a dependent variable and prescribing the wall shear variation. The boundary-layer method and a suitable potential flow method are used in an iterative procedure to produce a method for predicting the characteristics of ...
G. KUHN, J. NIELSEN
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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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Separating boundary-layer flow calculations

Journal of Computational Physics, 1979
Abstract The Box scheme has been used along with the Reyhner and Flugge-Lotz approximation and a nonlinear eigenvalue approach to inverse boundary-layer flows to compute flows with separation and reattachment. The approximate reverse flow region is corrected by a downstream-upstream iteration procedure similar to that introduced by Klemp and Acrivos,
Cebeci, T., Keller, H. B., Williams, P. G.   +2 more
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On turbulent boundary-layer separation

Journal of Fluid Mechanics, 1968
An experimental and analytical study of the separation of a turbulent boundary layer is reported. The turbulent boundary-layer separation model proposed by Sandborn & Kline (1961) is demonstrated to predict the experimental results. Two distinct turbulent separation regions, an intermittent and a steady separation, with correspondingly different ...
V. A. Sandborn, C. Y. Liu
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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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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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Incompressible Boundary-Layer Separation

Annual Review of Fluid Mechanics, 1977
For high-Reynolds-number flow over bodies or in confined channels the effects of viscosity are generally limited to a thin layer, the boundary layer, adjacent to the bounding surface. When the imposed pressure gradient is adverse, however, the thickness of the viscous layer increases as momentum is consumed by both wall shear and pressure gradient, and
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New Method for Supersonic Boundary-Layer Separations

AIAA Journal, 1974
An efficient numerical solution algorithm is presented for solving the interacting supersonic laminar boundarylayer problem. The method employs a time dependent approach with the alternating direction implicit (ADI) scheme and directly accounts for the necessary downstream boundary condition. Solutions are presented for MOO = 3 cold wall boundary-layer
Werle, M. J., Vatsa, V. N.
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