Castro: A new compressible astrophysical solver. II. Gray radiation hydrodynamics

W. Zhang, L. Howell, A. Almgren, Adam S. Burrows, J. Bell

Research output: Contribution to journalArticlepeer-review

68 Scopus citations


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.

Original languageEnglish (US)
Article number20
JournalAstrophysical Journal, Supplement Series
Issue number2
StatePublished - Oct 2011

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • diffusion
  • hydrodynamics
  • methods: numerical
  • radiative transfer


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