EVALUATION OF WEAK-EQUILIBRIUM CONDITION FOR AHFM IN CALCULATION OF ROTATING CHANNEL FLOW

摘要

The weak-equilibrium assumption is the basis in deriving the widely used algebraic model for turbulent heat flux. The budget equation of normalized turbulent heat flux is analyzed by using DNS data for fully developed rotating channel flow, thus the role of individual terms in the budget equation can be assessed. An asymptotic analysis of the near-wall behavior is performed and an alternative form of diffusion/transport constraint is proposed. The evaluation shows that the present alternative constraint has a potential to improve the predictive ability of algebraic heat flux models.