A k-ε-PDF TWO-PHASE TURBULENCE MODEL FOR SIMULATING SUDDEN-EXPANSION PARTICLE-LADEN FLOWS

摘要

A k-ε-PDF model based on statistical theory for turbulent gas-particle flows is proposed, and a numerical procedure combining the finite difference and finite fluctuating-velocity-group methods is used. The obtained statistically averaged equations have the same form as those obtained by using the Reynolds averaging. Using the k-ε-PDF model (PDF particle turbulence model combined with the k-ε gas turbulence model), many terms, such as the diffusion term in particle Reynolds Stress equations, can be exactly calculated. The k-ε-PDF model is used to simulate sudden-expansion particle-laden flows. Comparison of the predictions using both k-ε-PDF and the k-ε-k{sub}p models with experimental results shows that the k-ε-PDF model give more reasonable non-isotropic features of particle phase turbulence.