Direct and large eddy simulation of turbulent heat transfer at very low Prandtl number: Application to lead-bismuth flows

作者：Bricteux L; Duponcheel M; Winckelmans G; Tiselj I; Bartosiewicz Y^*

来源：Nuclear Engineering and Design, 2012, 246: 91-97.

DOI：10.1016/j.nucengdes.2011.07.010

This paper deals with the issue of modeling convective turbulent heat transfer of a liquid metal with a Prandtl number down to 0.01, which is the order of magnitude of lead-bismuth eutectic in a liquid metal reactor. This work presents a DNS (direct numerical simulation) and a LES (large eddy simulation) of a channel flow at two different Reynolds numbers, and the results are analyzed in the frame of best practice guidelines for RANS (Reynolds averaged Navier-Stokes) computations used in industrial applications. They primarily show that the turbulent Prandtl number concept should be used with care and that even recent proposed correlations may not be sufficient.

• 出版日期2012-5