The Analysis of Biomimetic Caudal Fin Propulsion Mechanism with CFD

Applied Bionics and Biomechanics
Guijie LiuGuanghao Li

Abstract

In nature, fish not only have extraordinary ability of underwater movement but also have high mobility and flexibility. The low energy consumption and high efficiency of fish propulsive method provide a new idea for the research of bionic underwater robot and bionic propulsive technology. In this paper, the swordfish was taken as the research object, and the mechanism of the caudal fin propulsion was preliminarily explored by analyzing the flow field structure generated by the swing of caudal fin. Subsequently, the influence of the phase difference of the heaving and pitching movement, the swing amplitude of caudal fin, and Strouhal number (St number) on the propulsion performance of fish was discussed. The results demonstrated that the fish can obtain a greater propulsion force by optimizing the motion parameters of the caudal fin in a certain range. Lastly, through the mathematical model analysis of the tail of the swordfish, the producing propulsive force principle of the caudal fin and the caudal peduncle was obtained. Hence, the proposed method provided a theoretical basis for the design of a high-efficiency bionic propulsion system.

References

Oct 7, 2004·IEEE Transactions on Systems, Man, and Cybernetics. Part B, Cybernetics : a Publication of the IEEE Systems, Man, and Cybernetics Society·Junzhi YuErkui Chen
Jan 21, 2014·Zoology : Analysis of Complex Systems, ZACS·Robert G Root, C W Liew
Apr 14, 2016·Bioinspiration & Biomimetics·Aditi Raj, Atul Thakur
Jan 10, 2018·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Taketeru TomitaKeiichi Sato

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