Study on a semi-resolved CFD-DEM method for rod-like particles in a gas-solid fluidized bed  

作　　者：Liping He Zhengxian Liu Yongzhi Zhao 

机构地区：[1]Department of Mechanics,School of Mechanical Engineering,Tianjin University,Tianjin,300350,China [2]Insttute of Process quipment,College of Energy Engineering,Zhejiang University,Hangzhou,30027,China

出　　处：《Particuology》2024年第4期20-36,共17页颗粒学报（英文版）

基　　金：funded by the National Natural Science Foundation of China (grant No.11972250);the National Key R&D Program of China (grant Nos.22YFE0207000 and 2022YFC3004505).

摘　　要：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.

关 键 词：CFD-DEM Semi-resolved method Fluid-solid flow Non-spherical particle Fluidized bed 

分 类 号：O35[理学—流体力学]