General-relativistic Radiation Transport Scheme in Gmunu. I. Implementation of 
Two-moment-based Multifrequency Radiative Transfer and Code Tests

Cheong, Patrick Chi-Kit; Ng, Harry Ho-Yin; Lam, Alan Tsz Lok; Li, Tjonnie Guang Feng

doi:10.3847/1538-4365/acd931

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General-relativistic Radiation Transport Scheme in Gmunu. I. Implementation of Two-moment-based Multifrequency Radiative Transfer and Code Tests

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Lam, Alan Tsz Lok
Computational Relativistic Astrophysics, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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2303.03261.pdf
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Cheong_2023_ApJS_267_38.pdf
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引用

Cheong, P.-C.-K., Ng, H.-H.-Y., Lam, A. T. L., & Li, T. G. F. (2023). General-relativistic Radiation Transport Scheme in Gmunu. I. Implementation of Two-moment-based Multifrequency Radiative Transfer and Code Tests. The Astrophysical Journal Supplement Series, 267(2):. doi:10.3847/1538-4365/acd931.

引用: https://hdl.handle.net/21.11116/0000-000D-9DF2-1

要旨

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.