Validation of the Large Interface Method of Neptune_cfd 1.0.8 for Pressurized Thermal Shock (pts) Applications

NEPTUNE_CFD is a code based on a 3D transient Eulerian two-fluid model. One of the main application targets is the two-phase Pressurized Thermal Shock (PTS), which is related to PWR Reactor Pressure Vessel (RPV) lifetime safety studies, when sub-cooled water from Emergency Core Cooling (ECC) system is injected into the possibly uncovered cold leg and penetrates into the RPV downcomer. Five experiments were selected for the validation. A co-current smooth and wavy airwater stratified flow in a rectangular channel with detailed measurements of turbulence and velocities allows to validate the dynamic models. A co-current smooth and wavy steam-water stratified flow in a rectangular channel with measurements of the steam flow rates allows to validate the condensation models. Two experiments dealing with a water jet impingement on a water pool free surface in air environment allow to validate the dynamic models in the situation of a jet impinging a pool free surface. Finally, the COSI experiment allows to validate all the models involved in the reactor conditions. The calculations are done with the same set of Large Interface Method (LIM) models and a RANS (k-ε) approach for turbulence. They substantiate the application of the tool to PTS studies.