Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 429, Issue 4, Pages 3533-3550Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sts632
Keywords
accretion, accretion discs; radiation transfer
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Funding
- NASA [NNX11AE16G]
- Princeton Center for Theoretical Science Fellowship
- NSF [TG-AST080026N, TG-AST100040]
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A numerical scheme is described for including radiation in multidimensional general relativistic conservative fluid dynamics codes. In this method, a covariant form of the M1 closure scheme is used to close the radiation moments, and the radiative source terms are treated semi-implicitly in order to handle both optically thin and optically thick regimes. The scheme has been implemented in a conservative general relativistic radiation hydrodynamics code KORAL. The robustness of the code is demonstrated on a number of test problems, including radiative relativistic shock tubes, static radiation pressure supported atmosphere, shadows, beams of light in curved space-time and radiative Bondi accretion. The advantages of M1 closure relative to other approaches such as the Eddington closure and flux-limited diffusion are discussed, and its limitations are also highlighted.
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