An implicit method for radiative transfer with the diffusion approximation in SPH

Details An implicit method for radiative transfer with the diffusion approximation in SPH An implicit method for radiative transfer with the diffusion approximation in SPH

2006-02-06

arxiv.org/abs/astro-ph/0602141v1

Astrophys.J. 639 (2006) 559-570

Astronomy and Astrophysics

Astrophysics

25 pages, 9 figures

Scientific paper

10.1086/499328

An implicit method for radiative transfer in SPH is described. The diffusion approximation is used, and the hydrodynamic calculations are performed by a fully three--dimensional SPH code. Instead of the energy equation of state for an ideal gas, various energy states and the dissociation of hydrogen molecules are considered in the energy calculation for a more realistic temperature and pressure determination. In order to test the implicit code, we have performed non--isothermal collapse simulations of a centrally condensed cloud, and have compared our results with those of finite difference calculations performed by MB93. The results produced by the two completely different numerical methods agree well with each other.

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