Flow Formed by Spanwise Gaps Between Roughness Elements

[+] Author and Article Information
Earl Logan, Shu Ho Lin, Obaidul Islam

Mechanical and Aerospace Engineering Department, Arizona State University, Tempe, AZ 85287

J. Fluids Eng 107(3), 385-391 (Sep 01, 1985) (7 pages) doi:10.1115/1.3242497 History: Received May 29, 1984; Revised April 01, 1985; Online October 26, 2009


Measurements of the three mean velocity components and the three Reynolds shear stresses were made in the region downstream of gaps between wall-mounted roughness elements of square cross section and high aspect ratio in a thick turbulent boundary layer. The effect of small and large gaps was studied in a wind tunnel at a Reynolds number of 3600, based on obstacle height and free-stream velocity. The small gap produces retardation of the gap flow as with a two-dimensional roughness element, but a definite interaction between gap and wake flows is observed. The interaction is more intense for the large gap than for the small. Both gaps generate a secondary crossflow which moves fluid away from the centerline in the wall region and toward the centerline in the outer (y > 1.5 H) region.

Copyright © 1985 by ASME
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