PLUTO Test Problems
4.4-patch2
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Radiative magnetized blast wave. More...
Sets up a 2D radiative magnetized blast wave. Initial conditions are set such that , so that matter dynamics is magnetically dominated when the opacities are low, and radiation-dominated in the opposite case. The latter case also serves to investigate the high-absorption regime in which both the diffusion approximation and LTE are valid.
Gas pressure and density are initially set as follows:
where and
are the ambient values while
and
identify the over-pressurized region. Here
is the cylindrical radius while
is a taper function that decreases linearly for
(we use
). The radiation field is initially introduced in equilibrium with the gas, with
. A null scattering opacity is set for every configuration.
The following setups are implemented:
Configurations #02 and #03 correspond to an absorption opacity , in which gas-radiation interaction produces a much more isotropic acceleration than in Configuration #01. The default IMEX1 method is implemented in Configuration #02 while the IMEX-SSP2(2,2,2) method by Pareschi and Russo (2005) is implemented in Configuration #03. In this problem, IMEX-SSP2(2,2,2) allows for larger time steps than IMEX1.
References