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On the wall structure of the turbulent boundary layer

Published online by Cambridge University Press:  11 April 2006

R. F. Blackwelder  and
R. E. Kaplan
R. F. Blackwelder
Affiliation:
Department of Aerospace Engineering, University of Southern California, Los Angeles
R. E. Kaplan
Affiliation:
Department of Aerospace Engineering, University of Southern California, Los Angeles
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Abstract

The wall structure of the turbulent boundary layer was examined using hot-wire rakes and conditional sampling techniques. Instantaneous velocity measurements indicate a high degree of coherence over a considerable area in the direction normal to the wall. At y+ = 15, there is some evidence of large-scale correlation in the spanwise direction, but almost no indication of the streamwise streaks that exist in the lower regions of the boundary layer. Conditional sampling showed that the normal velocity is directed outwards in regions of strong stream-wise-momentum deficit, and inwards when the streamwise velocity exceeds its mean value. The conditionally averaged Reynolds shear stress was approximately an order of magnitude greater than its conventionally averaged value and decayed slowly downstream.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 76 , Issue 1 , 14 July 1976 , pp. 89 - 112
Copyright
© 1976 Cambridge University Press

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