The CFD code CFX4.4 was used to simulate an experiment in the ThAI facility, which was designed for investigation of thermal-hydraulic processes during a severe accident inside a Light Water Reactor containment. In the considered experiment, air was initially present in the vessel, and helium and steam were injected during different phases of the experiment at various mass flow rates and at different locations. In the performed work, the 1 st and 2 nd phase of the considered experiment were simulated. The main purpose was to reproduce the nonhomogeneous temperature and species concentration distributions in the ThAI experimental facility. A three-dimensional model of the ThAI vessel for the CFX4.4 code was developed. The flow in the simulation domain was modelled as single-phase. Steam condensation on vessel walls was modelled as a sink of mass and energy using a correlation that was originally developed for an integral approach. A simple model of bulk phase change was also included. The calculated time dependent data together with temperature, concentrations and velocity distributions at the end of each phase are compared to experimental results.
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