| 沙漠与沙漠化 |
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| Large-Eddy Simulation of Two Dimensional Backward-Facing Step Gas-Particle Flows |
| WU Sheng-zhi, ZHAO Yu-jun, LIU Xiao-jun |
| Ministry of Education Key Laboratory of Mechanics on Disaster and Environment in Western China; School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China |
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Abstract The parameters of two dimensional backward-facing step gas-particles flows are studied numerically based on large-eddy simulation, Smagorinsky SGS stress model and SIMPLER algorithm. First, the variations of the reattachment positions of two dimensional backward-facing step with different upper flow channel and inlet velocities are revealed. Then, the solid particles with different diameters are traced by particle trajectory method, and the particle dispersion characteristics at different inlet velocities are disclosed. Results reveal that the particle motion is mainly controlled by its inertia force on the particles with diameter larger than 100 μm, and it is essentially controlled by air force for the particles with diameter less than 20 μm, and by both forces with transitional diameters. The research shows that large-eddy simulation is a powerful method to study the gas-particle two phase flows, and it can be used to guide construction of porous fence and performance of the gas-particle flow experiments in laboratory.
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Received: 06 January 2011
Published: 20 September 2011
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2011, Vol. 31 
