Suppression of Fluid Forces Acting on a Square Prism by Passive Control

[+] Author and Article Information
H. Sakamoto, N. Takeuchi, H. Haniu

Department of Mechanical Engineering, Kitami Institute of Technology, Kitami, 090, Japan

K. Tan

Department of Mechanical Engineering, Kushiro National College of Technology, Kushiro, 084, Japan

J. Fluids Eng 119(3), 506-511 (Sep 01, 1997) (6 pages) doi:10.1115/1.2819273 History: Received February 13, 1996; Revised February 11, 1997; Online December 04, 2007


Suppression of fluid forces acting on a square prism by passive control of the approaching flow was investigated in the present study. Flow was controlled using a small flat plate upstream of the prism. The position of the flat plate was varied within the range of S/W = 0 ~ 3.0 (S: distance between the flat plate and square prism, W: width of square prism) and the width h of the flat plate ranged from 2 mm to 8 mm (h/W = 0.05 ~ 0.19). Steady and unsteady fluid forces, vortex shedding frequency, and flow pattern were systematically investigated. The maximum reduction of time-averaged drag was 75 percent, and the maximum reduction in fluctuating lift and drag was 95 and 80 percent, respectively, using a flat plate 1/10 of the size of the square prism.

Copyright © 1997 by The American Society of Mechanical Engineers
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