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Topology Optimization of the Caudal Fin of the Three-Dimensional Self-Propelled Swimming Fish

Published online by Cambridge University Press:  03 June 2015

Zhiqiang Xin  and
Chuijie Wu
Zhiqiang Xin
Affiliation:
College of Mechanics and Materials, Hohai University, Nanjing 210098, China
Chuijie Wu*
Affiliation:
College of Mechanics and Materials, Hohai University, Nanjing 210098, China State Key Laboratory of Structural Analysis for Industrial Equipment & School of Aeronautics and Astronautics, Dalian University of Technology, Dalian 116024, China
*
*Corresponding author. Email: cjwudut@dlut.edu.cn
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Abstract

Based on the boundary vorticity-flux theory, topology optimization of the caudal fin of the three-dimensional self-propelled swimming fish is investigated by combining unsteady computational fluid dynamics with moving boundary and topology optimization algorithms in this study. The objective functional of topology optimization is the function of swimming efficiency, swimming speed and motion direction control. The optimal caudal fin, whose topology is different from that of the natural fish caudal fin, make the 3D bionic fish achieve higher swimming efficiency, faster swimming speed and better maneuverability. The boundary vorticity-flux on the body surface of the 3D fish before and after optimization reveals the mechanism of high performance swimming of the topology optimization bionic fish. The comparative analysis between the swimming performance of the 3D topology optimization bionic fish and the 3D lunate tail bionic fish is also carried out, and the wake structures of two types of bionic fish show the physical nature that the swimming performance of the 3D topology optimization bionic fish is significantly better than the 3D lunate tail bionic fish.

Keywords

76Z1074F103D bionic fishcaudal fintopology optimizationswimming performancevortex dynamics
Type
Research Article
Information
Advances in Applied Mathematics and Mechanics , Volume 6 , Issue 6 , December 2014 , pp. 732 - 763
Copyright
Copyright © Global-Science Press 2014

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