Optimum suppression of fluid forces acting on a circular cylinder

Journal Article · Wed Jun 01 04:00:00 EDT 1994 · Journal of Fluids Engineering; (United States)

DOI:https://doi.org/10.1115/1.2910258· OSTI ID:7266957

Sakamoto, H; Haniu, H ^[1]

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1. Kitami Inst. of Technology (Japan). Dept. of Mechanical Engineering

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 [approximately] 0.20 (G is the gap between main cylinder and control cylinder, d is diameter of main cylinder) and [alpha] = 0 [approximately] 180 deg ([alpha] is the angle along circumference from the front stagnation point of main cylinder) at a Reynolds number of 6.5 [times] 10[sup 4]. 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.

• OSTI ID: 7266957
• Journal Information: Journal of Fluids Engineering; (United States), Journal Name: Journal of Fluids Engineering; (United States) Vol. 116:2; ISSN 0098-2202; ISSN JFEGA4
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
CONTROL THEORY
CYLINDERS
DRAG
FLUID FLOW
FLUID MECHANICS
MECHANICS