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A numerical study of vortex shedding from flat plates with square leading and trailing edges

Published online by Cambridge University Press:  26 April 2006

Yuji Ohya ,
Yasuharu Nakamura ,
Shigehira Ozono ,
Hideki Tsuruta  and
Ryuzo Nakayama
Yuji Ohya
Affiliation:
Research Institute for Applied Mechanics, Kyushu University, Kasuga 816, Japan
Yasuharu Nakamura
Affiliation:
Research Institute for Applied Mechanics, Kyushu University, Kasuga 816, Japan
Shigehira Ozono
Affiliation:
Research Institute for Applied Mechanics, Kyushu University, Kasuga 816, Japan
Hideki Tsuruta
Affiliation:
Research Institute for Applied Mechanics, Kyushu University, Kasuga 816, Japan Mitsubishi Heavy Industries Ltd., Nagasaki-Shipyard, Nagasaki 850-91, Japan.
Ryuzo Nakayama
Affiliation:
National Technical College of Kitakyushu, Kitakyushu 803, Japan
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Abstract

This paper describes a numerical study of the flow around flat plates with square leading and trailing edges on the basis of a finite-difference analysis of the two-dimensional Navier—Stokes equations. The chord-to-thickness ratio of a plate, d/h, ranges from 3 to 9 and the value of the Reynolds number based on the plate's thickness is constant and equal to 103. The numerical computation confirms the finding obtained in our previous experiments that vortex shedding from flat plates with square leading and trailing edges is caused by the impinging-shear-layer instability. In particular, the Strouhal number based on the plate's chord increases stepwise with increasing d/h in agreement with the experiment. Numerical analyses also provide some crucial information on the complicated vortical flow occurring near the trailing edge in conjunction with the vortex shedding mechanism. Finally, the mechanism of the impinging-shear-layer instability is discussed in the light of the experimental and numerical findings.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 236 , March 1992 , pp. 445 - 460
Copyright
© 1992 Cambridge University Press

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