Vortex structures and performance of a tadpole in the wake of a blunt body

摘要

The vortex structure and hydrodynamic performance of a tadpole undulating in the wake of a blunt body are studied by solving the Navier-Stokes equations for the unsteady incompressible viscous flow. A dynamic mesh fitting the tadpole's deforming body surface is used in the simulation. It is found that three main factors can contribute to thrust of the tadpole behind a blunt body. At different undulating frequency, a tadpole may break or dodge vortices from the D-cylinder. However, vortices from a sphere are broken by the tadpole's snout.