As Fig. 6. Here, we show the relaxed state of a simulation with an outflow inner boundary condition without damping the radial velocity, but damping vφ → vK (ur, brown) and a model with no damping at the inner boundary at all (nd, purple). In the former case, the artificial cavity is clearly created in the damping zone, while the latter, undamped model only shows a surface density decrease at the innermost edge of the domain. The pink dotted lines (ir) show results of a model that uses the standard damping but features a closed inner BC. It only deviates slightly, hosting more mass in the inner disk.
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