Abstract
LES is a promising tool for predicting local entropy production in turbulent flows. Currently, there is no numerical model available for industrial design with an acceptable cost and prediction accuracy. Therefore the purpose of this research is modeling the entropy production in turbulent heat transfer fields, based on the filtered transport equations for LES. The entropy production in turbulent flows occurs in two ways: viscous dissipation and heat conduction. In our earlier work, the production by viscous dissipation was in quantitative agreement, but the production by heat conduction was not. In this paper, we introduced improved models for the production by heat conduction. One of the three models that were considered in this paper shows a smaller difference between DNS and LES.
