Abstract
The hydrodynamics and undulating propulsion of were studied using a newly developed two-dimensional finite difference method. The mechanism of thrust generation associated with the oscillating caudal fin is discussed. In this paper, the equations of motion are solved together with the incompressible flow to simulate the flow field induced by the undulate motions. In order to investigate flow/structure interaction varies with time, the analysis is performed on the moving meshes. The arbitrary Lagrangian–Eulerian (ALE) method is applied to the Navier-Stokes equations. Grid points are generated along with the fish camber line by using algebraic method at each time step. The results of these computation shows that the kinematics of oscillating caudal fin produces a jet-stream propulsion between inverse Karman vortex with high propulsive efficiency. Investigation of the effect of Reynolds number indicates that the turning radius increases with increasing Reynolds number with no ceiling in generating the jet-stream propulsion.
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