The RAGE radiation-hydrodynamic code

Details The RAGE radiation-hydrodynamic code The RAGE radiation-hydrodynamic code

2008-04-09

arxiv.org/abs/0804.1394v1

Comput. Sci. Disc. 1 (2008) 015005

Physics

Computational Physics

submitted to Computational Science and Discovery

Scientific paper

10.1088/1749-4699/1/1/015005

We describe RAGE, the ``Radiation Adaptive Grid Eulerian'' radiation-hydrodynamics code, including its data structures, its parallelization strategy and performance, its hydrodynamic algorithm(s), its (gray) radiation diffusion algorithm, and some of the considerable amount of verification and validation efforts. The hydrodynamics is a basic Godunov solver, to which we have made significant improvements to increase the advection algorithm's robustness and to converge stiffnesses in the equation of state. Similarly, the radiation transport is a basic gray diffusion, but our treatment of the radiation-material coupling, wherein we converge nonlinearities in a novel manner to allow larger timesteps and more robust behavior, can be applied to any multi-group transport algorithm.

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