A κ—ε—PDF Two—Phase Turbulence Model for Simulating Sudden—Expansion Particle—Laden FLows

A κ-ε-PDF model based on statistical theory for turbulent gas-particle flows is proposed.and a numerical procedure combining the finite difference and finite fluctuaing-velocity-group methods is used.The obtained statistically averaged equations have the same form as those obtained by using the Reynolds averaging.Using the κ-ε-PDF model(PDF particle turbulence model combined with the κ-ε- gas turbulence model),amny terms,such as the diffusion term in particle Reynolds Stress equations,can be accurately calcuated for verifying the second-moment-closure model,the κ-ε-PDF model is used to simulate sudden-expansion particle-laden flow.comparison of the predictions using both κ-ε-PDF and the κ-ε- models with experimental results shows that the κ-ε-PDF model give more reasonable non-siotropic features of particle turbulence.

Ak-?-PDF two-phase turbulence model for simulating sudden-expansion particle-laden flows

Ak-ɛ-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 thek-ɛ-PDF model (PDF particle turbulence model combined with thek-ɛ gas turbulence model), many terms, such as the diffusion term in particle Reynolds Stress equations, can be accurately calculated for verifying the second-moment-closure model. Thek-ɛ-PDF model is used to simulate sudden-expansion particle-laden flow. comparison of the predictions using bothk-ɛ-PDF and thek-ɛ-kp models with experimental results shows that thek-ɛ-PDF model give more reasonable non-isotropic features of particle turbulence.