Shear Effects on Flow past a Square Cylinder at Moderate Reynolds Numbers
Publication: Journal of Engineering Mechanics
Volume 138, Issue 1
Abstract
Direct numerical simulation (DNS) and large eddy simulation (LES) with a dynamic Smagorinsky subgrid model are performed to investigate the flow past a square cylinder under the influence of velocity shear at the inlet at moderate Reynolds numbers ( ). The shear rate is expressed by a dimensionless shear parameter , which is based on the velocity gradient, side length of the cylinder, and upstream velocity at the center plane of the cylinder. Shear parameter varies from 0 to 0.2 in this study. Several Reynolds numbers are considered to study the Reynolds number dependence and the Strouhal number were found to have no significant variation with the shear parameter. The peak frequency of drag coefficient fluctuation becomes identical with that of the lift force coefficient when . The vortices on the low-velocity side disappear in the far wake under the strong shear condition. The stagnation point moves to the high-velocity side and the movement increases with an increase in shear parameter. An interesting finding is that the lift force acts from the low-velocity to the high-velocity side, which is opposite to the case of a circular cylinder under the same inflow situation, whereas the drag force shows little variation with shear parameter.
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Acknowledgments
The writers would like to acknowledge the support provided by the Ministry of Education, Culture, Sports, Science and Technology, Japan, through the Global COE Program, MESSC-JP2008–2012. This research was funded in part by Natural Science Foundation of China (NSFC) Grant Nos. NSFC50978202 and NSFC51021140005; and Shanghai Pujang Program No. UNSPECIFIED10PJ1409700. The writers thank the referees whose constructive comments led to an improved paper.
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Information
Published In
Journal of Engineering Mechanics
Volume 138 • Issue 1 • January 2012
Pages: 116 - 123
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Jul 14, 2010
Accepted: Jul 27, 2011
Published online: Dec 15, 2011
Published in print: Jan 1, 2012
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