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ECN publication
CFD modelling of natural convection: validation report
Published by: Publication date:
ECN NUC 1998
ECN report number: Document type:
ECN-R--98-003 Other
Number of pages: Full text:
54 Download PDF  

The numerical solution is described of two considered elementary classes(heating from the side and heating from below) of natural convection flows using the Computational Fluid Dynamics (CFD) code CFX4.1. The numerical solutions are restricted to 2-dimensional flows. The numerical results have been compared with existing experimental and numerical data as reported in the literature. The present work has been performed in order to satisfy the central objectives of the validation of the CFX CFD numerical models for natural convection. The numerical results for natural convection flows as obtained with the low Reynolds number #kappa# - #epsilon# model of Launder and Sharma as implemented in CFX is in good agreement with experimental data (differences <20%). The application of the CFX standard #kappa# - #epsilon# model results in a significant overprediction (about 40%) of the wall heat transfer for these flows. 20 refs.

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