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Hydrodynamic performance of slender swimmer: effect of travelling wavelength

Published online by Cambridge University Press:  17 August 2022

Li-Ming Chao Open the ORCID record for Li-Ming Chao [Opens in a new window] ,
Md. Mahbub Alam Open the ORCID record for Md. Mahbub Alam [Opens in a new window]  and
Liang Cheng
Li-Ming Chao
Affiliation:
Center for Turbulence Control, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, PR China
Md. Mahbub Alam*
Affiliation:
Center for Turbulence Control, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, PR China
Liang Cheng
Affiliation:
Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian, Liaoning, 116024,PR China School of Civil Engineering, University of Western Australia, Perth, WA 6009, Australia
*
†Email address for correspondence: [email protected], [email protected]
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Abstract

The impact of Strouhal number St (= 0.1–1.0), Reynolds number Re (= 50–2000) and dimensionless wavelength λ (= 0.5–2.0) on the hydrodynamic performance of a travelling wavy foil of a constant length is extensively investigated. The relationship of time-mean thrust with St, Re and λ is presented, suggesting that the propulsive force increases with increasing St, Re and λ. As such, the drag–thrust boundary advances as these parameters increase. A shorter λ makes the thrust steadier while a longer λ enhances the maximum instantaneous thrust. The latter is beneficial for prey to escape from a predator. The fluid added mass caused by the foil oscillation increases with St and λ but declines with Re (<500). Seven types of wake structures produced by the foil are identified, discussed and connected to thrust generation, showing how St, Re and λ affect the fluid dynamics, wake transition, vortex strength, wake jet, velocity, added mass, added damping, power input, efficiency and pressure profiles. The outcome of this work renders a physical basis for understanding the swimming of aquatic animals.

JFM classification

Biological Fluid Dynamics: Swimming/flying Aerodynamics: Flow-structure interactions
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 947 , 25 September 2022 , A8
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Copyright
© The Author(s), 2022. Published by Cambridge University Press

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Footnotes

The online version of this article has been updated since original publication. A notice detailing the change has also been published.

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