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The passive safety is a crucial feature of advanced nuclear reactor (Gen IV)design. During loss of power scenarios, the downcomer plays a crucial role. Thefluid-flow behavior in the downcomer can involve forced to mixed to naturalconvection and characterizing the heat transfer for these changing regimes is adaunting challenge. High-resolution heat transfer numerical database canpotentially support the development of precise and affordable reducedresolution heat transfer models. These models can be designed based on amultiscale hierarchy developed as part of the recently DOE-funded center ofexcellence for thermal-fluids applications in nuclear energy. In this paper,the downcomer is simplified to heated parallel plates and High Prandtl numberfluid (FLiBe) is considered for all simulations. The calculations are performedfor a wide range of Richardson number from 0 to 400 at 2 different FLiBePrandtl numbers (12 and 24) which result in 40 simulated Cases in total. Timeaveraged and time series statistics as well as Nusselt number correlations areinvestigated to illuminate the mixed convection behaviors. The calculateddatabase will be instrumental in understanding the flow behaviors in thedowncomer. Ultimately, we aimed to evaluate existing heat transfer correlationsand some modifications will be proposed for Cases where no satisfactory choiceis available.

Direct Numerical Simulation of High Prandtl Number Fluid Flow in the Downcomer of an Advanced Reactor