Abstract
In our previous work, we have already computed backward-facing step flow using Large Eddy Simulation (LES) and obtained satisfactory results when compared with experimental data. In this paper, the behavior of time-averaged turbulence models and the influence of the diffusion model in the turbulent energy equation are investigated using the LES data base. It is found that the algebraic stress model describes this flow more accurately as compared with the eddy viscosity model, and that the gradient-diffusion model for the turbulent diffusion term cannot predict well the κ distribution in the recirculating region. A new diffusion model using TSDIA theory is applied and the relationship between the reattachment length and the turbulent energy distribution in the recirculating region is discussed.
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