| Autor: |
Cheong, Patrick Chi-Kit, Ng, Harry Ho-Yin, Lam, Alan Tsz-Lok, Li, Tjonnie Guang Feng |
| Rok vydání: |
2023 |
| Předmět: |
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| Zdroj: |
2023 ApJS 267 38 |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.3847/1538-4365/acd931 |
| Popis: |
We present the implementation of two-moment based general-relativistic multi-group radiation transport module in the $\texttt{G}$eneral-relativistic $\texttt{mu}$ltigrid $\texttt{nu}$merical ($\texttt{Gmunu}$) code. On top of solving the general-relativistic magnetohydrodynamics and the Einstein equations with conformally flat approximations, the code solves the evolution equations of the zeroth- and first-order moments of the radiations. Analytic closure relation is used to obtain the higher order moments and close the system. The finite-volume discretisation has been adopted for the radiation moments. The advection in spatial and frequency spaces are handled explicitly. In addition, the radiation-matter interaction terms, which are very stiff in the optically thick region, are solved implicitly. Implicit-explicit Runge-Kutta schemes are adopted for time integration. We test the implementation with a number of numerical benchmarks from frequency-integrated to frequency dependent cases. Furthermore, we also illustrate the astrophysical applications in hot neutron star and core-collapse supernovae modellings, and compare with other neutrino transport codes. |
| Databáze: |
arXiv |
| Externí odkaz: |
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