To select a Segregated Fluid Energy model, first select the Segregated Flow model. The Segregated Fluid Enthalpy and Segregated Fluid Temperature radio buttons will become available for selection under Optional Physics Models near the bottom of the dialog.
After selection, the Model Selection dialog will show that one of the Segregated Fluid Energy models has been selected, if the Auto-select recommended physics models checkbox is ticked.
If the Ideal Gas model is selected first, and there is no combustion, the Segregated Fluid Temperature model will be selected automatically as the recommended energy model.
If a non-adiabatic PPDF combustion model is active, Segregated Fluid Enthalpy is selected automatically, as it is the only appropriate choice for an energy model.