Anti-diffusive-like-behavior in semi-analytic radiative shocks via multigroup S-n transport with constant cross sections

作者：Holgado A M; Ferguson J M^*; McClarren R G

来源：High Energy Density Physics, 2015, 17: 114-118.

DOI：10.1016/j.hedp.2015.03.004

• Radiative shock
• Semi-analytic
• Multigroup
• Planck function
• Anti-diffusive

Semi-analytic lab-frame radiative shock solutions have been presented recently, wherein the radiation is modeled with either grey (frequency independent) nonequilibrium-diffusion or grey S-n-transport. As a first step toward incorporating frequency dependence, we retain grey cross-sections such that the frequency dependence of the problem is strictly due to the Planck function. By using multigroup frequency integration the frequency-dependent radiation-transport equation may be solved, and group-dependent radiation temperatures may be defined for each group. Our main result is: When a Zel'dovich temperature spike exists in a radiative shock solution, there exists a transition group g(T), such that for all frequency groups below g(T) the group-dependent radiation temperatures are spatially monotonic, and for all frequency groups above g(T) the group-dependent radiation temperatures are spatially non-monotonic. We present numerical evidence of our claim and make no claim as to the monotonicity of group g(T).

• 出版日期2015-12
• 单位Los Alamos