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Integral force acting on a body due to local flow structures

Published online by Cambridge University Press:  28 March 2007

J.-Z. WU ,
X.-Y. LU  and
L.-X. ZHUANG
J.-Z. WU*
Affiliation:
State Key Laboratory for Turbulence and Complex System, Peking University, Beijing, China University of Tennessee Space Institute, Tullahoma, TN 37388, USA
X.-Y. LU
Affiliation:
University of Science and Technology of China, Hefei, Anhui 230026, China
L.-X. ZHUANG
Affiliation:
University of Science and Technology of China, Hefei, Anhui 230026, China
*
†Author to whom correspondence should be addressed: jzwu@mech.pku.edu.cn, jzwu@utsi.edu
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Abstract

The forces exerted on a body moving through a fluid depend strongly on the local dynamic processes and structures generated by the body motion, such as flow separation, vortices, etc. A detailed and quantitative understanding of the effects of these processes and structures on the instantaneous overall force characteristics is of fundamental significance, and may improve our capabilities for flow analysis and control. In the present study, some unconventional force expressions based on ‘derivative-moment transformations’, which can have a rich variety of forms for the same flow field, are used to provide better insight into local dynamics. In particular, we apply jointly three alternative unconventional force expressions to analyse two numerical solutions of unsteady and viscous circular-cylinder flows. The results confirm the exactness of the expressions and, more importantly, provide a unified understanding of the specific influence on the force of each individual flow structure at its different evolution stages.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 576 , 10 April 2007 , pp. 265 - 286
Copyright
Copyright © Cambridge University Press 2007

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