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Turbulent boundary-layer flow over fixed aerodynamically rough two-dimensional sinusoidal waves

Published online by Cambridge University Press:  26 April 2006

W. Gong ,
Peter A. Taylor  and
Andreas Dörnbrack
W. Gong
Affiliation:
ARQI, Atmospheric Environment Service, 4905, Dufferin St., Downsview, Ontario, Canada, M3H 5T4
Peter A. Taylor
Affiliation:
Department of Earth and Atmospheric Science, York University, North York, Ontario, Canada, M3J 1P3
Andreas Dörnbrack
Affiliation:
Institute of Atmospheric Physics, DLR, D-82230, Oberpfaffenhofen, Germany
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Abstract

Results from a wind tunnel study of aerodynamically rough turbulent boundary-layer flow over a sinusoidal surface are presented. The waves had a maximum slope (ak) of 0.5 and two surface roughnesses were used. For the relatively rough surface the flow separated in the wave troughs while for the relatively smooth surface it generally remained attached. Over the relatively smooth-surfaced waves an organized secondary flow developed, consisting of vortex pairs of a scale comparable to the boundary-layer depth and aligned with the mean flow. Large-eddy simulation studies model the flows well and provide supporting evidence for the existence of this secondary flow.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 312 , 10 April 1996 , pp. 1 - 37
Copyright
© 1996 Cambridge University Press

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