From the simulation results it can seen that the disturbance vortex method still converges fast even the disturbance expansion is taken into consideration.

The results show that the wavy interface and vortex street are caused by the velocity distribution of shear flow and periodic disturbance at the interface.

Based on the potential theory, a linearity combination of the disturbance flow field generated by the uncompressible vortex part was applied in the computation of separate vortex flow.