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Vortex shedding from a rectangular prism and a circular cylinder placed vertically in a turbulent boundary layer

Published online by Cambridge University Press:  20 April 2006

Hiroshi Sakamoto  and
Mikio Arie
Hiroshi Sakamoto
Affiliation:
Department of Mechanical Engineering, Kitami Institute of Technology, Kitami, 090, Japan
Mikio Arie
Affiliation:
Hokkaido University, Sapporo, 060, Japan
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Abstract

Measurements of the vortex-shedding frequency behind a vertical rectangular prism and a vertical circular cylinder attached to a plane wall are correlated with the characteristics of the smooth-wall turbulent boundary layer in which they are immersed. Experimental data were collected to investigate the effects of (i) the aspect ratio of these bodies and (ii) the boundary-layer characteristics on the vortex-shedding frequency. The Strouhal number for the rectangular prism and the circular cylinder, defined by S = fcw/U0 and fcd/U0 respectively, was found to be expressed by a power function of the aspect ratio h/w (or h/d). Here fc is the vortex-shedding frequency, U0 is the free-stream velocity, h is the height, w is the width and d is the diameter. As the aspect ratio is reduced, the type of vortex shedding behind each of the two bodies was found to change from the Karman-type vortex to the arch-type vortex at the aspect ratio of 2·0 for the rectangular prism and 2·5 for the circular cylinder.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 126 , January 1983 , pp. 147 - 165
Copyright
© 1983 Cambridge University Press

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