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Transition Mode of Two Parallel Flags in Uniform Flow |
| WANG Si-Ying1,2, DUAN Wen-Gang1, YIN Xie-Zhen2** |
1Changjiang River Scientific Research Institute, Wuhan 430010
2University of Science and Technology of China, Hefei 230027
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| Cite this article: |
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WANG Si-Ying, DUAN Wen-Gang, YIN Xie-Zhen 2013 Chin. Phys. Lett. 30 110502 |
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Abstract The coupled flapping of two side-by-side identical flags in uniform flow is observed experimentally and numerically. Besides the early reported stable, in-phase, and out-of-phase modes, a transition mode between the in-phase and out-of-phase modes is newly presented. Essentially different from the other modes, the flapping in this transition mode is no longer a single cycle motion. Especially, the FFT analysis of the displacement-time curve indicates that there are multiple peaks of frequency in this mode, of which the smaller value is comparable to the frequency of the in-phase mode and the larger one is close to that of the out-of-phase mode. Changing of the weights of different single cycle motions may explain the mode transition.
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Received: 16 May 2013
Published: 30 November 2013
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| PACS: |
05.70.Fh
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(Phase transitions: general studies)
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47.54.-r
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(Pattern selection; pattern formation)
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05.45.-a
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(Nonlinear dynamics and chaos)
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