| 报告简介 | In this work, we try to develop an efficient asymptotic preserving method for frequency-dependent radiative transfer equations. Due to the optical opacity is frequency and temperature dependent, it varies from 0 to infinity, so that across three different regimes. We apply the characteristic based approach to get a revised model, and we modify it so that it can capture the free streaming regime. The new approximated model is solved by an asymptotic preserving Monte-Carlo method, in which we only solve a spatial dependent macroscopic equation (not frequency dependent). Based on the available macroscopic variables, it provides the emission source for the microscopic equation, which is then solved the Monte-Carlo method. The new method allows large time steps for all frequency regimes. Numerical experiments are given to demonstrate the effectiveness and efficiency of our approach. |
