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http://dx.doi.org/10.3795/KSME-B.2005.29.1.139

Numerical Study on Uniform-Shear Flow Over a Circular Cylinder  

Choi, Won-Ho (신영금속(주)기술부)
Kang, Sang-Mo (동아대학교 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.29, no.1, 2005 , pp. 139-150 More about this Journal
Abstract
The present study has numerically investigated two-dimensional laminar flow over a circular cylinder with a uniform planar shear, where the free-stream velocity varies linearly across the cylinder. Numerical simulations using the immersed boundary method are performed for the ranges of $50{\le}Re{\le}160,\;K{\le}0.2$, and B=0.1 and 0.05 where Re, K and B are the Reynolds number, the non-dimensionalized velocity gradient and the blockage ratio, respectively. Results show that the flow depends significantly on B as well as Re and K. It is found, especially, that the blockage effect accounts for some causes of apparent discrepancies among previous studies on the flow. With increasing K, the vortex shedding frequency and the mean drag stay nearly constant or slightly decrease whereas the mean lift, acting from the higher-velocity side to the lower, increases linearly. Flow statistics as well as instantaneous flow fields are presented to identify the characteristics of the flow and then to understand the underlying mechanism.
Keywords
Blockage Effect; Circular Cylinder; Uniform Shear;
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Times Cited By KSCI : 1  (Citation Analysis)
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