Numerical studies of the hysteresis in locomotion of a passi

发布时间：2018-11-28 09:44

【摘要】：The direct-forcing fictitious domain method is extended to simulate the locomotion of a passively pitching foil. Our study focuses on the hysteresis phenomenon that the critical frequency for the reverse of the locomotion direction of the wing in case of decreasing frequency is smaller than that in case of increasing frequency. In our simulations, the hysteresis phenomenon is produced by imposing different initial conditions at a same frequency. Our results indicate that the ratio of the heaving amplitudes of two foil edges is crucial to the direction of the foil's horizontal motion, and the amplitude of the leading edge is generally smaller. The critical frequencies for the reverse of the locomotion direction are increased, when the foil-fluid density ratio is decreased or the spring constant is increased. The critical frequencies in the bi-stability regime also depend on the initial velocity imposed, and the hysteresis loop generally becomes larger if the initial velocities are closer to the terminal locomotion velocities of the foil.
[Abstract]:The direct-forcing fictitious domain method is extended to simulate the locomotion of a passively pitching foil. Our study focuses on the hysteresis phenomenon that the critical frequency for the reverse of the locomotion direction of the wing in case of decreasing frequency is smaller than that in case of increasing frequency. In our simulations, the hysteresis phenomenon is produced by imposing different initial conditions at a same frequency. Our results indicate that the ratio of the heaving amplitudes of two foil edges is crucial to the direction of the foil's horizontal motion, and the amplitude of the leading edge is generally smaller. The critical frequencies for the reverse of the locomotion direction are increased, when the foil-fluid density ratio is decreased or the spring constant is increased. The critical frequencies in the bi-stability regime also depend on the initial velocity imposed, and the hysteresis loop generally becomes larger if the initial velocities are closer to the terminal locomotion velocities of the foil.
【作者单位】： State
【基金】：Project supported by the National Natural Science Foun-dation of China(Grant No.11372275) the Program for New Century Excellent Talents in University
【分类号】：O311

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【共引文献】

相关期刊论文 前1条

1 邵雪明;张晓龙;余钊圣;;Numerical studies of the hysteresis in locomotion of a passively pitching foil[J];Journal of Hydrodynamics;2016年03期

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1 韩瑞;张杰;曹垒;陆夕云;;Propulsive performance of a passively flapping plate in a uniform flow[J];Journal of Hydrodynamics;2015年04期

2 王雅峗;胡文蓉;张仕栋;;Performance of the bio-inspired leading edge protuberances on a static wing and a pitching wing[J];Journal of Hydrodynamics;2014年06期

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