Role of mass on the stability of flag/flags in uniform flow

Applied Physics Letters - Tập 103 Số 3 - 2013
Fang-Bao Tian1
1Department of Mechanical Engineering, Vanderbilt University , 2301 Vanderbilt Place, Nashville, Tennessee 37235-1592, USA

Tóm tắt

The interaction between flag/flags and fluid is studied numerically and the time-average flow in the wake is analyzed. It is found that a zero-mass flag in uniform flow can not exhibit sustained flapping which only occurs when the mass is involved, while multiple zero-mass flags with small separation settle into sustained flapping state. Furthermore, the nonzero mass is an essential condition for flag/flags to establish the sustained flapping in the case of convectively instable wake, while it is an unnecessary condition for the case of the absolutely instable wake.

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Applied Physics Letters

Tập 103 Số 3

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