Vorticity dynamics of maneuver locomotions of the three dimensional bionic fish

Abstract eng:
Numerical simulations of unsteady maneuvering of the 3D bionic fish in a viscous flow are investigated inthepresent study, using a 3D computational fluid dynamics package, which includes the adaptive multigrid finite volume method, the immersed boundary method and the control strategy of fish swimming With the direction control strategy of the swing of the head mainly, the 3D bionic fish can turn quickly and swim in a given semicircle path. The analysis of fluid mechanism of maneuver locomotion reveals that the rotation moment in favor of turning motion is yielded by the pressure around the fish body, which are induced by the wake vortex, and the swing of the fish can manipulate the location and strength of the vortices shedding from the fish body.

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