Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-11-16
J.Comput.Phys.227:776-796,2007
Astronomy and Astrophysics
Astrophysics
32 pages, 4 figs, JCP in press, improved description of boundary conditions at high momenta, references updated, version match
Scientific paper
10.1016/j.jcp.2007.08.013
A numerical method for integrating the equations describing a dynamically coupled system made of a fluid and cosmic-rays is developed. In smooth flows the effect of CR pressure is accounted for by modification of the characteristic equations and the energy exchange between cosmic-rays and the fluid, due to diffusive processes in configuration and momentum space, is modeled with a flux conserving method. Provided the shock acceleration efficiency as a function of the upstream conditions and shock Mach number, we show that the Riemann solver can be modified to take into account the cosmic-ray mediation without having to resolve the cosmic-ray induced substructure. Shocks are advanced with Glimm's method which preserves their discontinuous character without any smearing, thus allowing to maintain self-consistency in the shock solutions. In smooth flows either Glimm's or a higher order Godunov's method can be applied, with the latter producing better results when approximations are introduced in the Riemann solver.
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