Paper Profile

On CFD Methodology for Simulations of Whole Reactor Flow

Documents: Full paper available in Conference Proceedings.
Date: Monday October 19
Time:16:40 - 17:05
Session:1B1: ThermalHydraulics & Safety I
Authors: Xue-Nong Chen (Karlsruhe Institute of Technology, Germany)

This paper deals with the method how to apply a CFD code for whole reactor core and vessel flow simulations and overviews the recent developments in this topic. Two methods are introduced, namely coupling a channel model with CFD via boundary conditions and embedding a macroscopic channel model in CFD via differential equations. The latter one is recommended and further discussed in this paper, because there is a significant difficulty in realization of the former one. For treating heterogeneous core structure of pin bundle and wrapper, models of macroscopic pin bundle and fuel pin temperature are introduced and discussed. Numerical results based on SIMMER-III code are presented for a steady state as a subchannel benchmark in a LBE cooled reactor and for a power excursion in sodium cooled fast reactor. It is concluded that CFD with the embedded channel model can simulate the whole reactor flow without loss of details of subchannel characteristics.

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