Vorticity in Micro Scale Shock Vortex Interaction

Extensively investigations of the net voracity in micro-scale shock/vortex interaction were conducted by validated direct simulation of Monte Carlo (DSMC). The major characteristic is found that the strong shock/vortex interaction in micro-scale can cause an increase in enstrophy, which differs from the previous DSMC studies. investigations also show that the increase of the enstrophy causes an increase dissipation rate in during the strong interaction. The shock Mach number, vortex size and vortex Mach number turn out to play a critical role in the strength of interaction, which in turn govern the change in the dissipation rate. The ratio, of shock thickness to vortex core radius, is founded to be an important parameter which determines the tendency of enstrophy. When the ratio is more than about 0.5, the increasing of enstrophy disappear, which is different from the previous studies of macro-scale shock/vortex interaction. When the shock wave is strong enough to make the ratio less than 0.5, the macro interaction phenomenon tends to reproduce.