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Numerical Investigation of the Dynamics of a Flexible Filament in the Wake of Cylinder

Published online by Cambridge University Press:  03 June 2015

Ru-Nan Hua
Affiliation:
Department of Modern Mechanics, University of Science and Technology of China, Hefei 230026, China
Luoding Zhu
Affiliation:
Department of Mathematical Sciences, Indiana University-Purdue University Indianapolis, 402 North Blackford Street, Indianapolis, IN 46202, USA
Xi-Yun Lu*
Affiliation:
Department of Modern Mechanics, University of Science and Technology of China, Hefei 230026, China
*
*Corresponding author. URL:http://staff.ustc.edu.cn/~xlu/Email: xlu@ustc.edu.cn
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Abstract

Fluid-structure-interaction problems are ubiquitous, complicated, and not yet well understood. In this paper we investigate the interaction of a leading rigid circular cylinder and a trailing compliant filament and analyze the dynamic responses of the filament in the wake of the cylinder. It is revealed that there exist two flapping states of the filament depending on the cylinder-filament separation distance and the relevant critical distance distinguishing the two states is associated with the Reynolds number and the filament length. It is also found that the drag coefficient of the cylinder is reduced but that of the filament may be increased or decreased depending on its length. Compared with a single filament in a uniform flow, the filament of the same mechanical properties flapping in the wake of the cylinder has a lower frequency and a greater amplitude.

Type
Research Article
Copyright
Copyright © Global-Science Press 2014

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