首页|Study on a semi-resolved CFD-DEM method for rod-like particles in a gas-solid fluidized bed
Study on a semi-resolved CFD-DEM method for rod-like particles in a gas-solid fluidized bed
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Based on a semi-resolved CFD-DEM coupling method,this study proposed a method that uses the minimum distance between the fluid grid and the particle boundary as a reference value to determine the degree of influence of the target fluid grid on the particle's drag force.A fluidized bed of rod-like particles was chosen as a typical case to investigate the effect of different fluid grid scales on various fluidized bed characteristic parameters.The calculation performance of the semi-resolved and unre-solved CFD-DEM coupling algorithm on key fluidized bed characteristic parameters such as average pressure drop,particle frequency distribution with bed height,and particle orientation distribution were compared.It was found that the semi-resolved CFD-DEM coupling algorithm gradually obtained results with higher consistency with decreasing fluid grid scale for key parameters such as particle frequency distribution with bed height,particle orientation distribution,and time-history mixing index,exhibiting a phenomenon similar to grid independence in fluid simulation.By comparing with experimental results,it was verified that the semi-resolved CFD-DEM coupling algorithm can be applied to simulate multi-granular gas-solid systems with fluid grid scales equivalent to particle scales.This algorithm solves the limitation of fluid grid scale in the unresolved CFD-DEM coupling framework and improves the grid adaptability of the CFD-DEM coupling simulation algorithm.
CFD-DEMSemi-resolved methodFluid-solid flowNon-spherical particleFluidized bed
Liping He、Zhengxian Liu、Yongzhi Zhao
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Department of Mechanics,School of Mechanical Engineering,Tianjin University,Tianjin,300350,China
Institute of Process Equipment,College of Energy Engineering,Zhejiang University,Hangzhou,310027,China
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