When using the inhomogeneous model (particle and mixture models), you can select to solve a homogeneous turbulence field. In this case, a single turbulence field is solved for using a single turbulence model. This option is recommended for free surface flow using the inhomogeneous model, separated flow, stratified flow and any situation where the phases tend to separate out.

Note that using the fluid-dependent turbulence model option, when the same turbulence model is used in each phase, is not the same as using the homogeneous turbulence option. In the latter, a single turbulence field is solved instead of two separate fields that happen to use the same model.

The turbulence model chosen should be based on the advice given for single phase flow. For details, see Turbulence and Near-Wall Modeling.