Nonequilibrium Hypersonic Flows Simulations with Asymptotic-Preserving Monte Carlo Methods

In the rarefied gas dynamics, the 1)SNIC method is one of the most popular numerical tools. it performs satisfactorily in simulating hypersonic flows surrounding re-entry vehicles and micro-/nano- flows. Elowever, the computational cost is expensive, especially when Kn -> 0. Even for flows in the near-continuum regime, pure DSMC simulations require a number of computational efforts for most cases. Albeit- several DSMC/NS hybrid methods are proposed to deal with this, those methods still suffer from the boundary treatment, which may cause nonphysical solutions. Hlbet and lin II] proposed a framework of new numerical methods of Boltzmann equation, called asymptotic preserving schemes, whose computational costs are affordable as Kn -> 0. Recently, Ren et al. [2] realized the AP schemes with Monte Carlo methods (AP-DSMC), which have better performance than counterpart methods. In this paper. AP-DSMC is applied in simulating nonequilibrium hypersonic flows. Several numerical results are computed and analyzed to study the efficiency and capability of capturing complicated flow characteristics.