DNS and modelling of rotating channel flow with heat transfer

Rotating flows with heat transfer are encountered in many engineering-relevant applications such as in turbomachinery. However, it is no easy matter to make fine measurements of rotating flows with heat transfer. As an alternative, a direct numerical simulation (DNS) has been utilized to examine a canonical rotating flow, and a turbulence model has been used for predicting realistic rotating flows. In this study, to explore the turbulent transport mechanism of rotating shear flows with heat transfer, we have conducted the DNS of fully-developed turbulent rotating channel flows with heat transfer at various rotation numbers. Then, using the DNS results, we have assessed the existing linear and non-linear two-equation heat-transfer models to understand the performance of the models in rotating channel flows with heat transfer. Finally, we have reconstructed a two-equation turbulence model to predict rotating flows with heat transfer.