%0 Conference Paper %F Oral %T CFD simulation benchmark on thermal-hydraulic behaviour of light metal layer %+ Institut de recherche sur les systèmes nucléaires pour la production d'énergie bas carbone (IRESNE) %+ KTH School of Electrical Engineering %+ Bangor University %+ SSTC NRS (Vasylya Stusa St, 35-37, Kyiv, Ukraine) %+ CVŘ, Husinec-Rez 130 %A Seiler, Nathalie %A Drouillet, A. %A Bian, B. %A Villanueva, W. %A Vorobyov, Y. %A Zhabin, O. %A Kratochvil, M. %A Vyskocil, L. %Z The numerical French work was granted access to the HPC resources of the CEA's Very Large Computing Centre (TGCC) under the allocation 2022 A0092A07691 made by GENCI. %< avec comité de lecture %B ICONE30 - 30th International Conference on Nuclear Engineering %C Kyoto, Japan %8 2023-05-21 %D 2023 %K Focusing effect %K benchmark %K BALI experiment %K CFD Simulation %K turbulence %K Rayleigh-Bénard %Z Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn]Conference papers %X In the framework of the IAEA Coordinated Research Projects on In-Vessel Melt Retention, a benchmark of CFD simulations, devoted to thermal-hydraulic behavior of the light metal layer involves several research organizations: KTH of Sweden, SSTC NRS of Ukraine, ÚJV Řež of Czech Republic and CEA of France. This work aims at better simulating the focusing effect phenomenon leading to a heat flux peak along the height of the light metal layer, which is formed above the oxide layer in a stratified corium pool configuration during a PWR severe accident. This is a known safety issue compromising the reactor vessel integrity. The final stage of this benchmark is the simulation of realistic prototypical light metal layer configuration in case of severe accident. The first benchmark step provides a solid foundation to the CFD schemes (physical models, meshes) by comparing the results of CFD simulations with thermal-hydraulic experimental data obtained using water as simulating fluid in a representative and quite laminar configuration. Then a similar but highly turbulent case, of higher height, is considered for more complex validation of the numerical simulation approach. Results with different turbulent models are compared. On the strength of this encouraging work, a simulation of the same height configuration but considering steel fluid and severe accident conditions is foreseen at the final stage of this benchmark. %G English %2 https://cea.hal.science/cea-04026763/document %2 https://cea.hal.science/cea-04026763/file/ICONE30_paperV1_accepte.pdf %L cea-04026763 %U https://cea.hal.science/cea-04026763 %~ CEA %~ DEN %~ DEN-CAD %~ CEA-CAD %~ MAP-CEA