Abstract
An algebraic heat flux model is applied to predict turbulent heat transfer in separated and reattaching flows. Based on the prior low-Reynolds-number k- ε model of Park and Sung (1995), an improved version of the nonequilibrium heat transfer model is developed. The model performance is examined by solving the equations of the temperature variance k θ and its dissipation rate ε θ , together with the equations of k and ε. In the present model, the near-wall limiting behaviour close to the wall and the nonequilibrium effect away from the wall are incorporated. A tensor eddy-diffusivity is obtained to implement the orientation of mean temperature gradient in separated and reattaching flows. The validation of the model is applied to the turbulent flow over a backward facing step. The predictions of the present model are cross-checked with the existing measurements and direct numerical simulation (DNS) data. The model performance is shown to be generally satisfactory.
Published Version
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