Journal of Fluid Mechanics



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


R. A.  Antonia a1, D. K.  Bisset a1 and L. W. B.  Browne a1
a1 Department of Mechanical Engineering, University of Newcastle, N.S.W., 2308, Australia

Article author query
antonia ra   [Google Scholar] 
bisset dk   [Google Scholar] 
browne lw   [Google Scholar] 
 

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.

(Published Online April 26 2006)
(Received September 5 1988)
(Revised September 4 1989)



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