CASTRO: A New Compressible Astrophysical Solver. II. Gray Radiation Hydrodynamics
Abstract
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.
Keywords
Cite
@article{arxiv.1105.2466,
title = {CASTRO: A New Compressible Astrophysical Solver. II. Gray Radiation Hydrodynamics},
author = {W. Zhang and L. Howell and A. Almgren and A. Burrows and J. Bell},
journal= {arXiv preprint arXiv:1105.2466},
year = {2015}
}
Comments
accepted for publication in ApJS, high-resolution version available at https://ccse.lbl.gov/Publications/wqzhang/castro2.pdf