Topic: vortex

vortex , mass of fluid in whirling or rotary motion. To simplify the analysis, vortex motion usually describes motions in a frictionless fluid. In such cases the absence of friction would make it impossible to create or to destroy vortex motion. Motion in such a fluid would be a permanent flow pattern; the velocity of the fluid element instantaneously passing through a given point in space would be constant in time. Lines drawn so that their direction is that of the axis of rotation of the fluid are called vortex lines, and if these lines close on themselves they are called vortex rings. Hermann... Read more