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Turbulent flow over large-amplitude wavy surfaces

Published online by Cambridge University Press:  20 April 2006

Jeffrey Buckles ,
Thomas J. Hanratty  and
Ronald J. Adrian
Jeffrey Buckles
Affiliation:
Department of Chemical Engineering, University of Illinois, Urbana, 61801
Thomas J. Hanratty
Affiliation:
Department of Chemical Engineering, University of Illinois, Urbana, 61801
Ronald J. Adrian
Affiliation:
Department of Theoretical and Applied Mechanics, University of Illinois, Urbana, 61801
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Abstract

The laser-Doppler velocimeter is used to measure the mean and the fluctuating velocity for turbulent flow over a solid sinusoidal wave surface having a wavelength λ of 50.8 mm and a wave amplitude of 5.08 mm. For this flow, a large separated region exists, extending from x/λ = 0.14 to 0.69. From the mean velocity measurements, the time-averaged streamlines and therefore the extent of the separated region are calculated. Three flow elements are identified: the separated region, an attached boundary layer, and a free shear layer formed by the detachment of the boundary layer from the wave surface. The characteristics of these flow elements are discussed in terms of the properties of the mean and fluctuating velocity fields.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 140 , March 1984 , pp. 27 - 44
Copyright
© 1984 Cambridge University Press

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