Ansys Fluent provides a partially premixed combustion model that is based on the non-premixed combustion model described in Non-Premixed Combustion and the premixed combustion model described in Premixed Combustion. For information about using the partially premixed combustion model, see Modeling Partially Premixed Combustion in the User's Guide. Information about the theory behind the partially premixed combustion model is presented in the following sections: