Optimum Suppression of Fluid Forces Acting on a Circular Cylinder

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

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

J. Fluids Eng 116(2), 221-227 (Jun 01, 1994) (7 pages) doi:10.1115/1.2910258 History: Received September 22, 1993; Revised October 21, 1993; Online May 23, 2008


The objective of this paper is to investigate the suppression of the fluid forces acting on a circular cylinder (hereafter called the main cylinder) by controlling the flow around it. Flow control was established by introducing a fine circular cylinder (hereafter called the control cylinder) near the main cylinder. Measurements were carried out with variation of the position of the control cylinder in the ranges of G/d = 0.004 ~ 0.20 (G is the gap between main cylinder and control cylinder, d is diameter of main cylinder) and α = 0 ~ 180 deg (α is the angle along circumference from the front stagnation point of main cylinder) at a Reynolds number of 6.5 × 104 . Subsequently, the steady and unsteady fluid forces, vortex shedding frequency and flow pattern were systematically examined. Furthermore, such matters as the mechanism of the flow control, the nature of the controlled wake, the relationship between the characteristics of the controlled fluid forces, and the behavior of the flow were discussed in detail on the basis of the obtained results regarding fluid forces, vortex shedding frequency and flow pattern.

Copyright © 1994 by The American Society of Mechanical Engineers
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