Enstrophy Generation in a Shock-Dominated Turbulence

Abstract

A mechanism of enstrophy generation is investigated numerically in ashock-dominated turbulence driven by a random external force which hasonly the compressible component.Enstrophy is generated, especially on collision of shock, as a pairof vortex tube of opposite sense of rotation behind curved shocks.The roles of various terms in enstrophy equation are clarified inenstrophy generation process.Generation of enstrophy is enhanced by strong alignment of eachterm of the enstrophy equation with the vorticity vector.