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Vortex Structures in Turbulent Boundary Layers

Published online by Cambridge University Press:  04 July 2016

J. A. Clark  and
E. Markland
J. A. Clark
Affiliation:
Dept. of Mechanical Engineering, The Queen's University of Belfast
E. Markland
Affiliation:
Dept. of Mechanical Engineering, The Queen's University of Belfast
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Extract

The structure of turbulent boundary layers has recently been studied in detail. Using the hydrogen, bubble technique, Kline et al have detected intermittent formation of low-speed streaks very close to the surface, which lift away, thereby forming local inflexions in the velocity profile. These amplify disturbances, producing eddies which are ejected into the outer part of the layer. Black has proposed a turbulence model consisting of periodic horseshoe vortices within the layer, in which the longitudinal legs are stretched as they move through the comparatively quiescent layer.

Type
Technical Notes
Information
The Aeronautical Journal , Volume 74 , Issue 711 , March 1970 , pp. 243 - 244
Copyright
Copyright © Royal Aeronautical Society 1970 

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References

1. Kline, S. J., Reynolds, W. C., Schraub, F. A. and Runstadler, P. W. The Structure of Turbulent Boundary Layers. J. Fluid Mech, Vol 30 (4), pp 741–773, 1967.Google Scholar
2. Black, T. J. A New Model of the Shear Stress Mechanism in Wall Turbulence. AIAA Paper No 68–42, 1968.Google Scholar
3. Kovasznay, L. S. G. Proceedings Computation of Turbulent Boundary Layers—AFOSR—IFP—Stanford Conference, p 404. Editors: Kline, S. J., Sovran, G., Morkovin, M. V. and Cockrell, D. J., 1968.Google Scholar
4. Kim, H. T., Kline, S. J. and Reynolds, W. C. An Experimental Study of Turbulent Production near a Smooth Wall in a Turbulent Boundary Layer with Zero Pressure Gradient. Report MD-20, Thermosciences Division, Mech Engg Dept, Stanford University, 1968.Google Scholar