Accurate numerical simulations of vortex flows II: Interaction of swirling vortex rings

An accurate numerical method is applied to the investigation of the flow generated by two co-rotating vortex rings with axial flow in opposite direction at the Reynolds number Re = 2000. The rings are shown to generate a strong wake with significant axial vorticity due to the stretching induced by the rings. The rings merge and form a single ring with complex internal structure.