Vortex Dynamics of Stratified Shear Flow

A perturbed interface between fluids of different densities subject to a parallel shear flow is unstable. This interfacial instability is known as the Kelvin-Helmholtz (KH) instability and plays a dominant role in many physical phenomena. The nonlinear evolution of an interface subject to a parallel shear flow is studied on the basis of the vortex sheet model. We perform numerical simulations of the vortex sheet in density stratified fluids by using the point vortex method and investigate various aspects of dynamics of the stratified shear flow.