Abstract
The present study addresses a new effort to improve the prediction of the thermal field in separating-reattaching flows by making modifications in a low-Reynolds-number (LRN) version of HOGGDH heat-flux model proposed by Suga and Abe (2000). The modifications are based on introducing non-equilibrium effects of hydrodynamic flow field in the heat-flux model. Using an analytical approach, we have implemented P/ε, ignored in the base version, to the modified version. To do so, the model structure was changed and a damping function which is more sensitive to non-equilibrium flow features is also applied to the model. The modified heat-flux formulation along with a second moment closure hydrodynamic model is validated in a backstep flow, a periodic ribbed duct flow and a 3D high-blowing-ratio film cooling flow. Promising results are obtained compared with GGDH and HOGGDH models and the model performance is found to be comparable to θ2¯-εθ heat models, but with less computational and implementational complexity. For the film cooling flow, the rapid cooling efficiency drop due to the jet lift-off is accurately predicted though some margins to be improved still remain.
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