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Numerical analysis of vortex shedding behind a porous square cylinder

Tswen‐Chyuan Jue (Department of Vehicle Engineering, National Huwei Institute of Technology, Yunlin, Taiwan, Republic of China)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Publication date: 1 July 2004

Abstract

Vortex shedding behind a porous square cylinder is studied by a semi‐implicit projection finite element method in this paper. Flow fields over the porous square cylinder with various porosity and Darcy number were calculated to investigate the effects of porous media on Strouhal number, lift and drag coefficients at Re=100, 200 and 250. The global quantities of the shedding flow appear evident variation for Da varied from 10−5 to 10−4. In particular, Strouhal number displays an obvious jump for Da=10−4 at Re=250, due to the variation in flow structure near the cylinder. Larger Darcy number postpones the occurrence of flow fluctuation, and the oscillation flow presents stronger amplitude. However, the flow field and the characteristic values of vortex shedding for Da≤10−6 are almost not changed. For different porosity, time histories of CD and CL look similar. In conclusion, Darcy number demonstrates more influence on the flow field than porosity does.

Keywords

Citation

Jue, T. (2004), "Numerical analysis of vortex shedding behind a porous square cylinder", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 14 No. 5, pp. 649-663. https://doi.org/10.1108/09615530410539964

Publisher

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Emerald Group Publishing Limited

Copyright © 2004, Emerald Group Publishing Limited