||January 13, 2002 02:21
Re: vortex, vorticity, swirl, helicity
Vortex itself is a description of a special flow phenomenon. In fluid mechanics, it is strictly defined by vorticity. The helicity was originally defined as the intergation of scalar product of velocity vector and the vorticity vector. The momentum, the energy and the helicity are there main conservation variables of fluids. These things can be found in Frisch's `Turbulence'. I never come to strict definiation of swirl. It sounds like the vortex. Anyone knows?