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RESEARCH PAPERS

Vortex Shedding From a Circular Cylinder of Finite Length Placed on a Ground Plane

[+] Author and Article Information
Shiki Okamoto

Department of Mechanical Engineering, Shibaura Institute of Technology, Tokyo, Japan

Yukisada Sunabashiri

Nissan Motor Co., Ltd., Tokyo, Japan

J. Fluids Eng 114(4), 512-521 (Dec 01, 1992) (10 pages) doi:10.1115/1.2910062 History: Received March 27, 1991; Online May 23, 2008

Abstract

This paper describes a study of changes in the vortex formation and the turbulent wake from a circular cylinder with a finite aspect ratio, placed on a ground plane. The experiment was carried out in an N.P.L. blow down type wind-tunnel, with a working section of 500 mm × 500 mm × 2,000 mm, and between the Reynolds number 2.5 × 104 and 4.7 × 104 . The surface-pressure distributions on the circular cylinder were measured and the drag coefficient was determined from these measurements. Vortices of two kinds generated in the flow-field around the cylinder were observed. The power spectrum, auto-correlation, space-correlation, velocity defects, and turbulent intensities in the turbulent wake behind a circular cylinder were also measured. It was found that the flow pattern changed rapidly above aspect ratio H/D = 4, with vortex shedding changing from symmetric “arch” type to antisymmetric “Karman” type.

Copyright © 1992 by The American Society of Mechanical Engineers
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