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The effect of buoyancy on vortex shedding in the near wake of a circular cylinder

Published online by Cambridge University Press:  26 April 2006

Keun-Shik Chang  and
Jong-Youb Sa
Keun-Shik Chang
Affiliation:
Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology, P.O. Box 150, Cheongryang, Seoul, Republic of Korea
Jong-Youb Sa
Affiliation:
Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology, P.O. Box 150, Cheongryang, Seoul, Republic of Korea
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Abstract

The phenomenon of vortex shedding from a heated/cooled circular cylinder has been investigated numerically in the mixed natural and forced convection regimes. Accuracy of the computation was achieved by the fourth-order Hermitian relation applied to the contravariant velocity components in the convection terms of the vorticity transport equation, and by the far-boundary stream-function condition of an integral-series form developed by the authors. Purely periodic flows at Re = 100, efficiently established through the use of a direct elliptic solver called the SEVP, was found to degenerate into a steady twin-vortex pattern at the critical Grashof number 1500, confirming an earlier experimental observation identified as ‘breakdown of the Kármán vortex street’. Various other buoyancy effects about the heated/cooled cylinder are discussed by means of the flow patterns, the Nusselt number and the drag coefficient curves.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 220 , November 1990 , pp. 253 - 266
Copyright
© 1990 Cambridge University Press

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