The GEKO implementation has the following limitations:
Combination of GEKO with multiphase is not yet validated. However, the GEKO model is not fundamentally different from existing two-equation models to expect model-specific difficulties.
Caution: All possible combinations outside the turbulence panel have not been covered. In the situation where a sub-model (for example, in multi-phase flows) requires wall distance, it is recommended to avoid the Wall Distance Free option on the turbulence dialog box.