Astronomy and Astrophysics – Astrophysics – Instrumentation and Methods for Astrophysics
Scientific paper
2009-02-16
Astrophys.J.Suppl.186:308-333,2010
Astronomy and Astrophysics
Astrophysics
Instrumentation and Methods for Astrophysics
56 pages, 26 figures, submitted to the Astrophysical Journal Suppliments
Scientific paper
10.1088/0067-0049/186/2/308
In this work, we present MHDEnzo, the extension of the cosmological code Enzo to include the effects magnetic fields through the ideal MHD approximation. We use a higher order Godunov Riemann solver for the computation of interface fluxes. We use two constrained transport methods to compute the electric field from those interface fluxes, which simultaneously advances the induction equation and maintains the divergence of the magnetic field. A third order divergence free reconstruction technique is used to interpolate the magnetic fields in the block structured AMR framework already extant in Enzo. This reconstruction also preserves the divergence of the magnetic field to machine precision. We use operator splitting to include gravity and cosmological expansion. We then present a series of cosmological and non cosmological tests problems to demonstrate the quality of solution resulting from this combination of solvers.
Collins David C.
Li Hui
Li Shengtai
Norman Michael L.
Xu Hao
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