Краткое описание

Vortex structures in compressible isotropic turbulence are compared to those in incompressible isotropic turbulence in order to elucidate compressibility effects on vortices. It is shown that vortex cross-sections, vortex circulations, and some other quantities which characterize strength of swirling motions of vortices are suppressed by compressibility. The suppressions are attributed to effects of the density variations in the initial stage of vortex formation and succeeding reduction of the vortex stretching. It is also shown that waves excited on vortices are considerably changed by existence of compressibility.