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The effects of surface roughness on the flow past circular cylinders at high Reynolds numbers

Published online by Cambridge University Press:  20 April 2006

Y. Nakamura  and
Y. Tomonari
Y. Nakamura
Affiliation:
Research Institute for Applied Mechanics, Kyushu University, Fukuoka, Japan
Y. Tomonari
Affiliation:
Research Institute for Applied Mechanics, Kyushu University, Fukuoka, Japan Present address: Department of Aeronautical Engineering, Ohita Institute of Technology, Ohita, Japan.
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Abstract

Measurements of’ the mean-pressure distribution and the Strouhal number on a smooth circular cylinder, circular cylinders with distributed roughness, and circular cylinders with narrow roughness strips were made over a Reynolds-number range 4.0 × l04 to 1.7 × l06 in a uniform flow. A successful high-Reynolds-number (trans- critical) simulation for a smooth circular cylinder is obtained using a smooth circular cylinder with roughness strips. High-Reynolds-number simulation can only be obtained by roughness strips and not by distributed roughness. A similarity parameter correlating the pressure distributions on circular cylinders with distributed roughness in the supercritical range is presented. The same parameter can also be applicable to the drag coefficients of spheres with distributed roughness.

Information

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 123 , October 1982 , pp. 363 - 378
Copyright
© 1982 Cambridge University Press

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