湍流分离流中颗粒的扩散机制

doi:10.3969/j.issn.1007-2861.2015.03.002

Journal of Shanghai University（Natural Science Edition） ›› 2016, Vol. 22 ›› Issue (5): 586-596.doi: 10.3969/j.issn.1007-2861.2015.03.002

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Particles diffusion mechanism in turbulent separation flow

QIU Xiao, DING Jue, WANG Zhongjie, WENG Peifen

Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China

Received:2015-06-12 Online:2016-10-31 Published:2016-10-31

Abstract

Abstract:

Back-facing step flow contains important characteristics of a separation flow. Based on this, a numerical simulation on particles diffusion mechanism in turbulent separation flow was conducted by Euler-Lagrangian coupled method. The gas phase governing equations were solved by large eddy simulation method and the subscale grid model was solved by Smagorinsky model. The particle phase was tracked with Lagrangian method. The accuracy of the solver was tested by comparing the simulation results with the experiment data. Based on this solver, the characteristics of the two phase flow, and the developing and evolutional process of vortex were numerically analyzed. The results showed that the diffusion of particles was related to particle’s diameter, the interaction time between particles and vortex structures. The structure of vortex changed when an obstacle was added to the flow field. The number of vortex increased at a certain distance away from the obstacle. The particles concentrate at the edge of the vortex and the distribution of particles were nonuniform in the flow field.

Key words: Euler-Lagrangian method , gasparticle flow , large-eddy simulation, separation flow , backward-facing step flow

QIU Xiao, DING Jue, WANG Zhongjie, WENG Peifen. Particles diffusion mechanism in turbulent separation flow[J]. Journal of Shanghai University（Natural Science Edition）, 2016, 22(5): 586-596.

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Particles diffusion mechanism in turbulent separation flow

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