Coupled states of dual side-by-side inverted flags in a uniform flow

The dynamics of dual side-by-side inverted flags with free leading edges and clamped trailing edges in a uniform flow are simulated using the immersed boundary method. The dynamics of the two inverted flags are systematically analyzed in terms of the bending rigidity, the gap distance between flags...

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Bibliographic Details
Published in:Journal of fluids and structures 2019-11, Vol.91, p.102768, Article 102768
Main Authors: Jia, Kang, Fang, Le, Huang, Wei-Xi
Format: Article
Language:English
Subjects:
Bistability
Dynamic regime
Inverted flag
Side-by-side
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Summary:The dynamics of dual side-by-side inverted flags with free leading edges and clamped trailing edges in a uniform flow are simulated using the immersed boundary method. The dynamics of the two inverted flags are systematically analyzed in terms of the bending rigidity, the gap distance between flags and the six initial conditions which are set by adjusting the initial angle of attack of flags. Four distinct dynamic regimes are observed: straight, flapping, chaotic and deflected regimes. According to the relative bending directions in which the inverted flags are bent, the deflected regime is further divided into three sub-regimes: outside deflected, inside deflected and one-side sub-regimes. It is found that the initial conditions exert an influence on which sub-regime to occur. Bistable state occurs in transition from the straight regime to the flapping regime, from the chaotic regime to the flapping regime, and from the flapping regime to the deflected regime.
ISSN:0889-9746
1095-8622
DOI:10.1016/j.jfluidstructs.2019.102768