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Article Dans Une Revue Nuclear Engineering and Design Année : 2024

Modeling single-phase transverse flows in a PWR rod bundle at low Reynolds number

Résumé

In normal functioning conditions, the primary component of the flow within the rod bundle of a PWR core is in the axial direction, along the rods. However, in accidental situations, such as the refilling or reflooding phase during a Loss of Coolant Accident, or a Steam Line Break accident, transverse flows may significantly affect thermal-hydraulic properties in the core. Such effects have received little attention in system codes such as CATHARE, particularly in anisotropic rod structures at low Reynolds numbers. Here, we develop macroscopic pressure drop models for flows spanning from the creeping regime to unsteady vortex shedding. The averaged model is a generalized Darcy-Forchheimer equation with an apparent permeability including a rotation matrix and a non-linear dimensionless coefficient. The constitutive relations for the intrinsic permeability matrix are derived from polynomial regressions based on results obtained from microscale numerical simulations at different flow directions and Reynolds numbers. We finally test our approach in a case where transverse flow is imposed through a differential of inlet velocities and validate by comparing results from CATHARE with those obtained from a finite element toolbox.
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Dates et versions

cea-04370869 , version 1 (03-01-2024)

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Qinjun Fu, Andre Bergeron, Philippe Fillion, Yohan Davit, Michel Quintard. Modeling single-phase transverse flows in a PWR rod bundle at low Reynolds number. Nuclear Engineering and Design, 2024, 416, pp.112752. ⟨10.1016/j.nucengdes.2023.112752⟩. ⟨cea-04370869⟩
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