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

Published online by Cambridge University Press:  02 September 2010

SOHAE KIM ,
WEI-XI HUANG  and
HYUNG JIN SUNG
SOHAE KIM
Affiliation:
Department of Mechanical Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea
WEI-XI HUANG
Affiliation:
Department of Mechanical Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea
HYUNG JIN SUNG*
Affiliation:
Department of Mechanical Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea
*
‡Email address for correspondence: [email protected]
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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).

JFM classification

Biological Fluid Dynamics: Swimming/flying Wakes/Jets: Wakes
Type
Papers
Information
Journal of Fluid Mechanics , Volume 661 , 25 October 2010 , pp. 511 - 521
Copyright
Copyright © Cambridge University Press 2010

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References

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