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Structure of turbulent boundary layers on smooth and rough walls

Published online by Cambridge University Press:  26 April 2006

P.-Å. Krogstad  and
R. A. Antonia
P.-Å. Krogstad
Affiliation:
Division of Mechanics, Thermo- and Fluid Dynamics, Norwegian Institute of Technology, N-7034 Trondheim, Norway
R. A. Antonia
Affiliation:
Department of Mechanical Engineering, University of Newcastle, NSW, 2308, Australia
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Abstract

The structure of turbulent boundary layers which develop with zero pressure gradient on a smooth wall and a k-type rough wall was examined using arrays of X-wires. Although the data were obtained only on two orthogonal planes, the technique provides some information on the three-dimensionality of the large-scale structures. The major effect of the roughness is to tilt the inclination of the structures towards the wall-normal direction. This is caused by the reduced damping of the wall-normal velocity fluctuations close to the rough surface and the break-up of structures whose scales are comparable to the size of the roughness elements. Both effects cause a reduction in the streamwise lengthscales, as suggested by all the measured two-point correlations. The correlations also show that the roughness tends to reduce the overall anisotropy of the large-scale motion. There is evidence to suggest that the magnitude of the vorticity field is larger over the rough wall.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 277 , 25 October 1994 , pp. 1 - 21
Copyright
© 1994 Cambridge University Press

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