For a non-adiabatic premixed combustion model, note that the value you specify for the TurbulentSchmidt Number will also be used as the Prandtl number for energy. (The Energy Prandtl Numberwill therefore not appear in the Viscous Model dialog box for non-adiabatic premixed combustionmodels.) These parameters control the level of diffusion for the progress variable and for energy. Theprogress variable is closely related to energy (because the flame progress results in heat release), so itis important that the transport equations use the same level of diffusion.