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Suppression of the von Kármán vortex street behind a circular cylinder by a travelling wave generated by a flexible surface

Published online by Cambridge University Press:  15 February 2007

CHUI-JIE WU ,
LIANG WANG  and
JIE-ZHI WU
CHUI-JIE WU*
Affiliation:
Research Center for Fluid Dynamics, PLA University of Science and Technology, Nanjing 211101, China Institute of Hydraulics and Hydroelectrics, Hohai University, Nanjing 210098, China
LIANG WANG
Affiliation:
Research Center for Fluid Dynamics, PLA University of Science and Technology, Nanjing 211101, China Institute of Hydraulics and Hydroelectrics, Hohai University, Nanjing 210098, China
JIE-ZHI WU
Affiliation:
State Key Laboratory for Turbulence and Complex System, Peking University, Beijing 100871, China University of Tennessee Space Institute, Tullahoma, TN 37388, USA
*
†Author to whom correspondence should be addressed: cjwu@jlonline.com or cj_wu@163.com
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Abstract

An advanced moving-wall control strategy to manage the unsteady separated flow over a circular cylinder is developed. A two-dimensional numerical simulation of the flow over the cylinder at Re=500 based on diameter indicates that, when the downstream half of the cylinder surface is made flexible to form an appropriate travelling transverse wave, a ‘fluid roller bearing’ (FRB) is produced consisting of a row of vortices trapped by each wave trough, which can keep the global flow attached against a strong adverse pressure gradient, eliminating the vortex shedding and reducing the average drag by 85%. Physically, the FRB serves as a sheath to effectively inhibit the momentum–energy exchange between the thin fluid layer adjacent to the wall and the main stream, so that the wall layer is scaled only to the local wavelength and frequency and is independent of the global scales. Therefore, the global adverse pressure gradient on the lee side of the cylinder no longer influences the near-wall flow, and the common root cause of flow separation is removed. The input power for actuating the flexible wall is found to be 94% of the power saving due to drag reduction.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 574 , 10 March 2007 , pp. 365 - 391
Copyright
Copyright © Cambridge University Press 2007

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