Papalexandris, MiltiadisDutoit, ValentinValentinDutoit2025-05-142025-05-142025-05-142019https://hdl.handle.net/2078.2/14152Since the Fukushima Daiichi nuclear disaster on 11 March 2011, particular attention has been paid to the study of nuclear Spent Fuel Pools (SFP). These pools are designed so that the water cools the spent fuel by absorbing its decay heat and provides shielding from radiation emitted during its decay. In case of accident, there is a risk that the water of the SFP boils off due to the decay heat of the spent fuel rods, potentially leading to an exposure of the fuel and a release of radioactive elements into the atmosphere. The development of numerical tools to study the phenomenon of turbulent natural convection in these spent-fuel pools could lead to major improvements in terms of safety and risks management. In this work, we carry out both Direct Numerical and wall resolved Large-Eddy Simulations of Rayleigh-Bénard convection problem and compare their predictions with the open-source CFD package OpenFOAM. More specifically, we intend to validate two classical sub-grid scale models; the dynamic k-equation model and the dynamic Lagrangian model.Rayleigh-Bénard convectionDNSLESTurbulencetext::thesis::master thesisthesis:22291