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Turbulence Models and Large Eddy Simulations Applied to Ascending Mixed Convection Flows

This paper is one of the most comprehensive studies on mixed convection flows currently available in the literature. In this work a meticulous assessment of various advanced mathematical/computational representations of fluid turbulence (‘turbulence models’) was carried out. The models were compared against experimental and numerical data for buoyancy-affected flows, such flows being representative of low-flow-rate flows in the cores of nuclear reactors (both presently-operating Advanced Gas-cooled Reactors and proposed ‘Generation IV’ designs). Wide variations in turbulence model performance were identified. Three different CFD codes have been employed in the work: ‘CONVERT’, ‘STAR-CD’, and ‘Code_Saturne’, which are respectively in-house, commercial, and industrial packages. Cross-code comparison tests have also been reported.