CavityRatio
This parameter is specific to
a set of simulations performed to evaluate the efficiency of planet
trapping at a cavity edge. Unless you want to reproduce these
simulations, you should simply ignore this variable. If you use it, you
also have to define CavityRadius and CavityWidth. CavityRatio is the target surface
density ratio of the outer to the inner disk. Outside of the cavity (r > CavityRadius), the surface
density profile is whatever is given by Sigma0
and SigmaSlope, while inside the cavity
it corresponds to this profile divided by CavityRatio. Similarly, outside the
cavity the viscosity is whatever is prescribed by Viscosity or AlphaViscosity,
while inside the cavity it corresponds to either value multiplied by CavityRatio.