CFD for two-phase flows - recent developments, status and further requirements -

The use of Computational Fluid Dynamics (CFD) Codes for two-phase flow problems in Nuclear Safety Research is discussed. Examples for recent developments are the qualification of MUSIG model for dispersed flows and the modelling of free surfaces. Up to now the predictive capabilities of CFD codes for two-phase flows are limited to special cases. Nevertheless a valuable contribution to understand such complex flows is obtained. The aim of the future research is to develop CFD codes towards a quantitative method to obtain reliable predictions for broad range of applications.