Hydrodynamics of tadpole swimming in the wake of a cylinder

Abstract eng:
The vortex structures and hydrodynamic performance of a tadpole undulating in the wake of a D-section cylinder are studied by solving the Navier-Stokes equations for the unsteady incompressible viscous flow. It is found that three factors can contribute to thrust of the tadpole behind a D-cylinder. Tadpole's relative undulating frequency and the distance between the Dcylinder and the tadpole have a great influence on both vortex structure and hydrodynamic performance. At different undulating frequency, a tadpole may break or dodge vortices from the D-cylinder, corresponding to the performance of the tadpole. As the tadpole is located behind the D-cylinder at different distances, three typical kinds of wake are observed.

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