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Constructive and destructive interaction modes between two tandem flexible flags in viscous flow

  • SOHAE KIM (a1), WEI-XI HUANG (a1) and HYUNG JIN SUNG (a1)
Abstract

Two tandem flexible flags in viscous flow were modelled by numerical simulation using an improved version of the immersed boundary method. The flexible flapping flag and the vortices produced by an upstream flag were found to interact via either a constructive or destructive mode. These interaction modes gave rise to significant differences in the drag force acting on the downstream flapping flag in viscous flow. The constructive mode increased the drag force, while the destructive mode decreased the drag force. Drag on the downstream flexible body was investigated as a function of the streamwise and spanwise gap distances, and the bending coefficient of the flexible flags at intermediate Reynolds numbers (200 ≤ Re ≤ 400).

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COPYRIGHT: © Cambridge University Press 2010
Corresponding author
‡Email address for correspondence: hjsung@kaist.ac.kr
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Journal of Fluid Mechanics
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