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Journal of Hydrodynamics

, Volume 18, Issue 1, pp 428–432 | Cite as

Hydrodynamics in a diamond-shaped fish school

Session A7

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.

Key words

fish-like swimming propulsion fish school 

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References

  1. [1]
    Gray J. Studies in animal locomotion. VI. The propulsive powers of the dolphin [J]. J. Exp. Biol, 1936, 13: 92–199.Google Scholar
  2. [2]
    Fish F, Hui CA. Dolphin swimming — a review [J]. Mammal Rev, 1991, 21: 181–195.CrossRefGoogle Scholar
  3. [3]
    Fein J. Dolphin drag reduction: Myth or magic. Proc. Int. Symp. Seawater Drag Reduction, Newport, RI. 1998Google Scholar
  4. [4]
    Sfakiotakis M, Lane DM, Bruce J. Review of foil swimming modes for aquatic locomotion [J]. IEEE Journal of Oceanic Engineering, 1999, 24(2): 237–352.CrossRefGoogle Scholar
  5. [5]
    Triantafyllou MS, Techet AH, Hover FS. Review of experimental work in biomimetic foils [J]. IEEE Journal of Oceanic Engineering, 2004, 29(3): 585–594.CrossRefGoogle Scholar
  6. [6]
    Triantafyllou MS, Triantafyllou GS, Yue DKP. Hydrodynamics of fishlike swimming [J]. Annu. Rev. Fluid Mech, 2000, 32: 33–53.MathSciNetCrossRefGoogle Scholar
  7. [7]
    Triantafyllou MS, Techet AH, Zhu Q, Beal DN, Hover FS, and Yue DKP. Vorticity control in fish-like propulsion and maneuvering [J]. Integr. Comp. Biol, 2002, 42: 1026–1031.CrossRefGoogle Scholar
  8. [8]
    Colgate JE, Lynch KM. Mechanics and control of swimming: a review [J]. IEEE Journal of Oceanic Engineering, 2004, 29(3): 660–673.CrossRefGoogle Scholar
  9. [9]
    Pedro G, Suleman A, Djilali N. A numerical study of the propulsive efficiency of a flapping hydrofoil [J]. International Journal for Numerical Methods in Fluids, 2003, 42: 493–526.MathSciNetCrossRefGoogle Scholar
  10. [10]
    Anderson JM, Streitlien K, Barrett DS, Triantafyllou MS. Oscillating foils of high propulsive efficiency [J]. Journal of Fluid Mechanics, 1998, 360: 41–72.MathSciNetCrossRefGoogle Scholar
  11. [11]
    Lu XY, Yin XZ. Propulsive performance of a foil-like traveling wavy wall [J]. Acta Mechanica, 2005, 175: 197–215.CrossRefGoogle Scholar
  12. [12]
    Wu JZ, Pan ZL, Lu XY. Unsteady fluid-dynamic force solely in terms of control-surface integral [J]. Physics of Fluids, 2005, 17(9): 098102.CrossRefGoogle Scholar
  13. [13]
    Cushing DH, and Harden-Jones FR. Why do fish school? [J] Nature, 1968, 218: 918–920.CrossRefGoogle Scholar
  14. [14]
    Weihs D. Hydromechanics of fish schooling [J]. Nature, 1973, 241: 290–291.CrossRefGoogle Scholar
  15. [15]
    Zou JF, Ren AL, Deng J. Wake structures of two spheres in tandem arrangement at various gaps for Re = 300 [J]. Progress in Natural Science, 2005, 15(2): 19–23.MATHGoogle Scholar
  16. [16]
    Deng J, Ren AL, Zou JF. Three-dimensional flow around two tandem circular cylinders with various spacing at Re = 220 [J]. Journal of Hydrodynamics, Ser.B, 2006, 18(1):48–54.MATHGoogle Scholar
  17. [17]
    Deng J, Ren AL, Zou JF, Shao XM. Numerical simulations of flow around two circular cylinders in cruciform arrangement and two spheres in tandem arrangement by virtual boundary method [J]. Chinese Journal of Theoretical and Applied Mechanics, 2005, 37(5): 542–550.Google Scholar
  18. [18]
    Deng J, Shao XM, Ren AL. A new modification of the immersed-boundary method for simulating flows with complex moving boundaries [J]. International Journal for Numerical Methods in Fluids. (in press)Google Scholar

Copyright information

© China Ship Scientific Research Center 2006

Authors and Affiliations

  1. 1.Department of MechanicsZhejiang UniversityHangzhouChina
  2. 2.Department of Mechanics, State Key Laboratory of Fluid Power Transmission and ControlZhejiang UniversityHangzhouChina

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