Hydrodynamic performance of slender swimmer : effect of travelling wavelength

Chao, Li-Ming; Mahbub Alam, Md.; Cheng, Liang

Hydrodynamic performance of slender swimmer : effect of travelling wavelength

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Date

2022

Authors

Chao, Li-Ming

Mahbub Alam, Md.

Cheng, Liang

Publication type

Journal article

Publication status

Published

Published in

Journal of Fluid Mechanics ; 947 (2022). - A8. - Cambridge University Press. - ISSN 0022-1120. - eISSN 1469-7645

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.

Subject (DDC)

570 Biosciences, Biology

Keywords

swimming/flying, flow-structure interactions

Cite This

ISO 690

CHAO, Li-Ming, Md. MAHBUB ALAM, Liang CHENG, 2022. Hydrodynamic performance of slender swimmer : effect of travelling wavelength. In: Journal of Fluid Mechanics. Cambridge University Press. 947, A8. ISSN 0022-1120. eISSN 1469-7645. Available under: doi: 10.1017/jfm.2022.624

BibTex

@article{Chao2022Hydro-66008,
  year={2022},
  doi={10.1017/jfm.2022.624},
  title={Hydrodynamic performance of slender swimmer : effect of travelling wavelength},
  volume={947},
  issn={0022-1120},
  journal={Journal of Fluid Mechanics},
  author={Chao, Li-Ming and Mahbub Alam, Md. and Cheng, Liang},
  note={Article Number: A8}
}

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Refereed

Unknown