Equilibrium test with nonlinear diffusion coefficient. Top: radiative energy profile for the DTA (adaptive time step, black) and DTU (unique time step, red) models, and for the stationary analytic solution (dashed line). The right axis indicates the AMR levels of the DTA and DTU models (dotted line). Bottom: relative error profiles for the DTA (black), DTU (red) and uniform grid (256 cells, blue) models.
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