Title: On the Importance of Validation when using Commercial CFD Codes in Nuclear Reactor Safety
Authors: BARALDI DANIELE
Other Contributors: WILKENING HEINZ
Citation: CFD4NRS (Computation Fluid Dynamics for Nuclear Reactor Safety) Benchmarking of CFD Codes for Application to Nuclear Reactor Safety vol. (2006) p. Paper 28
Publisher: OECD Nuclear Energy Agency
Publication Year: 2006
JRC N°: JRC32833
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC32833
Type: Articles in periodicals and books
Abstract: The commercial CFD (Computational Fluid Dynamics) CFX has been benchmarked against the HyJet dispersion experiment performed in the Battelle-Model-Containment. The dispersion process during an accidental hydrogen release is very essential for safety reasons as it defines the initial conditions for a possible hydrogen combustion event. For the experiment various turbulent models (k-epsilon, RNG and SST) and two computational grids have been applied. Reasonable prediction of the heat transfer to structures was only possible when using an innovative hybrid mesh (prism grid in the boundary in combination with a tetrahedral volume gird) in combination with the novel SST model. Also concerning the dispersion process itself only good results could be obtained when using the SST model, which worked out for the hybrid grid but also with the conventional pure tetrahedral grid.
JRC Directorate:Energy, Transport and Climate

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