Journal of Aero Aqua Bio-mechanisms
Online ISSN : 2185-1522
ISSN-L : 2185-1522
Original Papers
Numerical Optimization of Thrust Efficiency of Propulsion in Fluid using a Fin with Variable Stiffness
Masataka NakabayshiYusuke YamaguchiWataru Yamazaki
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2016 Volume 5 Issue 1 Pages 1-9

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Abstract

Underwater propulsion using a flexible elastic fin that mimics fish locomotion is investigated. Because the degree of elasticity is important for thrust efficiency, a fin with a dynamic variable-effective-length spring as a variable-stiffness mechanism is experimentally analyzed. The yawing of the elastic fin in still water is simulated using fluid-structure interaction analysis. There is a clear relationship between the effective length of the spring and Young's modulus for the dynamic stiffness of the fin. Additionally, using the kriging surface response approach, thrust efficiency is demonstrated to be better under dynamic conditions.

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© 2016 Society of Aero Aqua Bio-mechanisms
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