Specify how steep is the edge of the cavity, if it exists
Author: Frederic Masset
CavityWidthis the radial distance , expressed in disk pressure scale heights , over which the surface density and viscosity transitions occur. More precisely, log(viscosity) is an affine function of between and , where is specified by
CavityRadius. Note that the surface density is only approximately initialized to the corresponding cavity, so the initial state is not a steady state. If you want a steady state, you should allow your system to relax over a few viscous timescales.