![]() Time- and frequency-domain analysis are employed for comparison of the numerical and experimental data.The investigation shows a good qualitative prediction of the bulk flow patterns. ![]() ![]() They correspond to a buoyancy-driven, a momentum-driven, and a transitional coolant mixing pattern in the downcomer. Three test cases with different flow rates are considered. Experimental data from the Rossendorf Coolant Mixing (ROCOM) facility is used as a basis for validation. The current investigation deals with the accuracy of LES approach with respect to the experiment. The feasibility and mesh resolution of LES for single-phase PTS are assessed earlier in a companion paper. The turbulence modeling may impact overall accuracy of the calculated thermal loads on the vessel walls, therefore advanced methods for turbulent flows are required. Pressurized Thermal Shock (PTS) is identified as one of the safety issues where Computational Fluid Dynamics (CFD) can bring real benefits.
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June 2023
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