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RESEARCH PAPERS

A Correction Formula for Wall Effects on Unsteady Forces of Two-Dimensional Bluff Bodies

[+] Author and Article Information
Terukazu Ota, Hiroyuki Yoshikawa

Department of Machine Intelligence and Systems Engineering, Tohoku University, Aramaki, Aoba-ku, Sendai 980-77, Japan

Yasunori Okamoto

Mechanical Engineering Laboratory, Daikin Kogyo Co. Ltd., Kanaoka, Sakai 591, Japan

J. Fluids Eng 116(3), 414-418 (Sep 01, 1994) (5 pages) doi:10.1115/1.2910292 History: Received August 27, 1992; Revised June 06, 1994; Online May 23, 2008

Abstract

In wind tunnel studies on the flow around bluff bodies accompanying a large separated wake, the walls of the test section severely effect the flow characteristics around them. Proposed in this paper is a correction formula for the wall effects upon two-dimensional (2-D) unsteady separated flow of incompressible fluid around bluff bodies. The proposed formula is derived from numerical results with the discrete vortex method on 2-D separated flows around an inclined flat plate, a square cylinder, and also an elliptic cylinder located between two parallel walls. It is found that the present correction formula estimates reasonably well the wall effects upon the mean and fluctuating force coefficients over a wide range of blockage ratio and angle of attack through comparing the present calculated results with numerous experimental ones by several authors.

Copyright © 1994 by The American Society of Mechanical Engineers
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