what are vortex
In fluid dynamics, a vortex is a region in fluid where the flow revolves around an axis line, which may be straight or curved. Vortices are formed in stirred fluids, and may be observed in smoke rings, whirlpools in the wake of boat, or the winds surrounding a tornado or dust devil. Vortices are a major component of turbulent flow. The distribution of velocity, vorticity, as well as the concept of circulation are used to characterize vortices. In most vortices, the fluid flow velocity is greates