minimal_temperature:0# (Optional) Minimal temperature (in internal units) allowed for the gas particles. Value is ignored if set to 0.
H_mass_fraction:0.755# (Optional) Hydrogen mass fraction used for initial conversion from temp to internal energy. Default value is derived from the physical constants.
H_ionization_temperature:1e4# (Optional) Temperature of the transition from neutral to ionized Hydrogen for primoridal gas.
viscosity_alpha:0.8# (Optional) Override for the initial value of the artificial viscosity. In schemes that have a fixed AV, this remains as alpha throughout the run.
viscosity_alpha_max:2.0# (Optional) Maximal value for the artificial viscosity in schemes that allow alpha to vary
viscosity_alpha_min:0.1# (Optional) Minimal value for the artificial viscosity in schemes that allow alpha to vary
viscosity_length:0.1# (Optional) Decay length for the artificial viscosity in schemes that allow alpha to vary