PLUTO Test Problems
4.4-patch2
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Shadow test. More...
Sets up a 2D problem in which a free-streaming radiation field encounters a highly opaque region of space, casting a shadow behind it.
A constant density is fixed in the whole space, except in an elliptic region around the coordinate origin where
. In order to have a smooth transition between
and
, the initial density field is defined as
where . Initially, matter is set in thermal equilibrium with radiation at a temperature
, and fluxes and velocities are initialized to zero. Radiation is injected from the left boundary at a temperature
, with a flux
.
In all configurations scattering is neglected, while the absorption opacity is set as constant in Configuration #1, and according to Kramers' law, i.e., , in Configurations #2 and #3.
Only the upper half of the elliptic region is described in Configurations #1 and #3, where reflective boundary conditions have been imposed at the bottom boundary. Conversely, the entire elliptic region is described in Configuration #2, where outflow conditions are imposed in all boundaries but the left one. AMR can be applied to Configuration #3, where cells are tagged for refinement for large values of the second derivative of .
References