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Numerical study of propulsion mechanism for oscillating rigid and flexible tuna-tails

Yang, L. and Su, Y. M. and Xiao, Q. (2011) Numerical study of propulsion mechanism for oscillating rigid and flexible tuna-tails. Journal of Bionic Engineering, 8 (4). pp. 406-417. ISSN 1672-6529

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Abstract

Numerical study on the unsteady hydrodynamic characteristics of oscillating rigid and flexible tuna-tails in viscous flow-field is performed. Investigations are conducted using Reynolds-Averaged Navier-Stokes (RANS) equations with a moving adaptive mesh. The effect of swimming speed, flapping amplitude, frequency and flexure amplitude on the propulsion performance of the rigid and flexible tuna-tails are investigated. Computational results reveal that a pair of leading edge vortices develop along the tail surface as it undergoes an oscillating motion. The propulsive efficiency has a strong correlation with various locomotive parameters. Peak propulsive efficiency can be obtained by adjusting these parameters. Particularly, when input power coefficient is less than 2.8, the rigid tail generates larger thrust force and higher propulsive efficiency than flexible tail. However, when input power coefficient is larger than 2.8, flexible tail is superior to rigid tail.

Item type: Article
ID code: 41763
Keywords: hydromechanics, swimming propulsion, tuna-tail, fin, performance, RANS, hydrodynamic characteristics, propulsion mechanism, viscous flow-fields, numerical study , oscillating, rigid, flexible, Naval architecture. Shipbuilding. Marine engineering, Bioengineering, Biotechnology, Biophysics
Subjects: Naval Science > Naval architecture. Shipbuilding. Marine engineering
Department: Faculty of Engineering > Naval Architecture and Marine Engineering
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Depositing user: Pure Administrator
Date Deposited: 26 Oct 2012 14:59
Last modified: 27 Mar 2014 10:37
URI: http://strathprints.strath.ac.uk/id/eprint/41763

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