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Hydrodynamics in a diamond-shaped fish school

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Abstract

In this paper, the computational fluid dynamics was applied to fish-like swimming, and the propulsion mechanism of this motion was focused. Although previous researchers have suggested that a diamond shape of fish school is helpful for drag reduction and efficiency enhancement, and individuals can benefit from such a school, experimental data or numerical studies on the hydrodynamics of interactions among members in the fish school are lacking. An improved immersed boundary method was employed for the simulations, and a basic element of three fishes was picked out from the diamond-shaped fish school. The conclusion is drawn that a fish situated laterally midway between two fish of the preceding column can benefit from the reversed Karman vortex street shedding from the upstream fish; and therefore the propulsion efficiency is increased, and the power consumed is reduced. Such a result accords well with the previous hypothesis.

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Authors and Affiliations

  1. Department of Mechanics, Zhejiang University, Hangzhou, 310027, China

    Jian Deng

  2. Department of Mechanics, State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou, 310027, China

    Xue-ming Shao

Authors
  1. Jian Deng
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  2. Xue-ming Shao
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Corresponding author

Correspondence to Jian Deng.

Additional information

Project supported by the National Lab of Hydrodynamics of China

Biography: DENG Jian (1981-), Male, Ph.D. Candidate

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Deng, J., Shao, Xm. Hydrodynamics in a diamond-shaped fish school. J Hydrodyn 18 (Suppl 1), 428–432 (2006). https://doi.org/10.1007/BF03400483

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  • DOI: https://doi.org/10.1007/BF03400483

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