physics/sourceTerms/Diffuse useDiffuse [BOOLEAN] CONSTANT [FALSE] flags whether the Diffuse unit is being used physics/sourceTerms/Diffuse/DiffuseMain diffusion_cutoff_density [REAL] [1.e-30] Valid Values: Unconstrained density below which we no longer diffuse dt_diff_factor [REAL] [0.8] Valid Values: Unconstrained factor that scales the timestep returned by Diffuse_computeDt geometric_mean_diff [BOOLEAN] [FALSE] thermal_diff_method [INTEGER] [1] Valid Values: Unconstrained useDiffuse [BOOLEAN] [TRUE] whether any method of the Diffuse unit should contribute to fluxes useDiffuseSpecies [BOOLEAN] [TRUE] whether Diffuse_species [TO BE IMPLEMENTED] should contribute to fluxes useDiffuseTherm [BOOLEAN] [TRUE] whether Diffuse_therm should contribute to fluxes useDiffuseVisc [BOOLEAN] [TRUE] whether Diffuse_visc should contribute to fluxes