Journal
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
Volume 196, Issue 2, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/0067-0049/196/2/20
Keywords
diffusion; hydrodynamics; methods: numerical; radiative transfer
Categories
Funding
- Office of High Energy Physics
- Office of Advanced Scientific Computing Research of the U.S. Department of Energy [DE-AC02-05CH11231]
- U.S. Department of Energy [DE-AC52-07NA27344]
- DOE [DE-FG02-08ER41544]
- NSF [ND201387, OCI-0905046]
- Louisiana State University [44592]
- Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231]
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We describe the development of a flux-limited gray radiation solver for the compressible astrophysics code, CASTRO. CASTRO uses an Eulerian grid with block-structured adaptive mesh refinement based on a nested hierarchy of logically rectangular variable-sized grids with simultaneous refinement in both space and time. The gray radiation solver is based on a mixed-frame formulation of radiation hydrodynamics. In our approach, the system is split into two parts, one part that couples the radiation and fluid in a hyperbolic subsystem, and another parabolic part that evolves radiation diffusion and source-sink terms. The hyperbolic subsystem is solved explicitly with a high-order Godunov scheme, whereas the parabolic part is solved implicitly with a first-order backward Euler method.
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