Mechanism of Closed Vortex Formation in Shear Flow

抄録

The vorticity evolution induced by a source doublet that turns out in a two-dimensional shear flow is investigated analytically for an incompressible inviscid fluid.The velocity field is obtained by use of the linearized Euler equation and the equation of continuity. The process of the closed vortex formation around the doublet and the interaction of these closed vortex are shown by investigating the time development of the disturbance vorticity.