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|Abstract:||We present a formulation for multigroup radiation hydrodynamics that is correct to order O(v/c) using the comoving-frame approach and the flux-limited diffusion approximation. We describe a numerical algorithm for solving the system, implemented in the compressible astrophysics code, CASTRO. CASTRO uses a 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. In our multigroup radiation solver, the system is split into three parts: one part that couples the radiation and fluid in a hyperbolic subsystem, another part that advects the radiation in frequency space, and a parabolic part that evolves radiation diffusion and source–sink terms. The hyperbolic subsystem and the frequency space advection are solved explicitly with high-order Godunov schemes, whereas the parabolic part is solved implicitly with a first-order backward Euler method. Our multigroup radiation solver works for both neutrino and photon radiation.|
|Electronic Publication Date:||28-Dec-2012|
|Citation:||Zhang, W, Howell, L, Almgren, A, Burrows, A, Dolence, J, Bell, J. (2013). CASTRO: A New Compressible Astrophysical Solver. III. Multigroup Radiation Hydrodynamics. The Astrophysical Journal Supplement Series, 204 (7 - 7. doi:10.1088/0067-0049/204/1/7|
|Type of Material:||Journal Article|
|Journal/Proceeding Title:||The Astrophysical Journal Supplement Series|
|Version:||Final published version. This is an open access article.|
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