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Effect of Reynolds number on the topology of the organized motion in a turbulent boundary layer

Published online by Cambridge University Press:  26 April 2006

R. A. Antonia ,
D. K. Bisset  and
L. W. B. Browne
R. A. Antonia
Affiliation:
Department of Mechanical Engineering, University of Newcastle, N.S.W., 2308, Australia
D. K. Bisset
Affiliation:
Department of Mechanical Engineering, University of Newcastle, N.S.W., 2308, Australia
L. W. B. Browne
Affiliation:
Department of Mechanical Engineering, University of Newcastle, N.S.W., 2308, Australia
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Abstract

The influence of Reynolds number on the topology of the organized motion in a turbulent boundary layer is studied with the use of an array of eight ×-probes in the plane of mean shear. Instantaneous sectional streamlines and contours of large-scale approximations to the spanwise vorticity and strain rate suggest that the motion is relatively complicated at all Reynolds numbers. Contours, conditioned on the spatially coherent increase in the velocity fluctuation u, extend to larger distances from the wall at the smaller Reynolds numbers. Reasonable correspondence is found between the location of this increase in the near-wall region and the end of a burst. Associated with this increase is an important contribution to the Reynolds shear stress throughout the layer. This contribution is larger at the smaller Reynolds numbers.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 213 , April 1990 , pp. 267 - 286
Copyright
© 1990 Cambridge University Press

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