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CFD analysis of non-axial flow in fuel assemblies

Abstract : CFD studies with the Trio_U code were performed to evaluate the flow field and pressure drop in rod bundles with a slope angle of 22° between main flow and the axis of the rods. Comparison to the CEA experimental program EOLE is discussed which was performed with inclined rod bundles in in a square channel. Finally, the inter-assembly flow in two adjusted parts of fuel assemblies, separated by the assembly bypass flow, is analyzed. The large eddy simulation (LES) method is used to account for nonisotropic turbulence. A mesh of 1.1 billion control volumes was used for this analysis. The simulation has been performed on 10,000 processor cores of the HPC computer CURIE of the TGCC. The correlation of the EOLE program under estimates the pressure drop of the assembly calculation by a factor of about six. In contrary to the flow in the open, unbounded core region modeled by the assembly calculation, the EOLE experiments have been performed in a square channel. Thus, questions rise concerning the applicability of correlations derived from a channel configuration to the unbounded core region. Simulating the flow in the inclined rod bundle of the EOLE experiment by using the open boundary conditions of the assembly calculation confirms the under prediction of the correlation.
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  • HAL Id : cea-02509183, version 1

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U. Bieder. CFD analysis of non-axial flow in fuel assemblies. NURETH 16 - 16th International Topical Meeting on Nuclear Reactor Thermalhydraulics, Aug 2015, Chicago, United States. ⟨cea-02509183⟩

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