Application of a Reynolds stress/heat flux model to the turbulent thermal diepersion behind a line heat source in a unifomly sheared flow

Abstract

A second-order Reynolds stress/heat flux closure model is applied to predict the turbulent thermal dispersion behind a line heat source in a uniformly sheared flow. The exact governing equations for Reynolds stress, heat flux, and other scalar fluctuating quantities are formulated and modeled. The concept of effective buoyancy Reynolds stress is introduced to incorporate the buoyancy effect in the turbulent thermal diffusion. The model predictions are compared with the relevant experiments. The simple gradient transport model predictions are also included for comparison. The model performance is shown to be generally satisfactory.