Erosion of a confined stratified layer by a vertical jet - Detailed assessment of a CFD approach against the OECD/NEA PSI benchmark

Different impacts on the simulation results, in particular on the jet profile and on the mixing progress, are discussed in this paper. A systematic validation is carried out based on measured and derived quantities. It is identified that e.g. the mesh resolution in the jet and mixing zone has only a minor impact, while small changes in turbulence modeling strategy or the chosen model constants, like Sct, significantly affect the simulation results. Finally, the chosen unsteady RANS model represents mixing process consistently in the transient progression and instantaneous flow variables, while an unexpected difference between the k-ε-SST and the standard k-ε model in predicting the jet flow was identified.