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| 1 | IMPROVED DEM-CFD MODEL AND VALIDATION:A CONICAL-BASE SPOUTED BED SIMULATION STUDY显示文摘An improved and efficient DEM-CFD approach is developed for spouted beds.A nonlinear Discrete Element Method(DEM) ,with a concept of spring,dash-pot and friction slider,is used for tracing the movement of each individual particle.The gas flow is described by a set of reorganized governing equations.Two phases are coupled through contributions due to effects of porosity,viscosity and drag.All equations are solved with the commercial package Fluent with an implementation of User Defined Functions(UDF) .To validate the improved model,a two-dimensional conical-base spouted bed is chosen as a case study.An unstructured mesh system is adopted instead of regular grid system.The simulation also takes the Saffman force and Magnus effect into account.The calculation results show good agreement with the experimental observations which are taken from the literature. | RONG Liang-wan ZHAN Jie-min | 2010 | Journal of Hydrodynamics2010，22，3： | 6 |
| 2 | 二维喷动床CFD-DEM模拟中曳力模型的影响显示文摘CFD-DEM已经广泛应用到喷动床的研究中,其模拟的准确性与用于处理颗粒-流体相互作用的曳力模型密切相关。为了探究不同曳力模型对喷动床CFD-DEM模拟结果的影响,基于非结构化网格的喷动床仿真,使用7个曳力模型分别对锥底喷动床内气固两相运动进行了数值模拟。综合床层压降、喷动高度和颗粒速度特性三个方面,Wen-Yu模型和Gibilaro模型预测的气固两相运动最剧烈,其次是Di Felice模型、Syamlal-O’Brien模型、Gidaspow模型和Huilin-Gidaspow模型,BVK模型预测的气固两相运动最平缓。由于模拟的气固两相体系属于密相体系,Huilin-Gidaspow模型的光滑过渡函数没有产生效果,所以Gidaspow模型和Huilin-Gidaspow模型在各个方面的预测结果基本一致。 | 周连勇 赵永志 | 2022 | 计算力学学报2022，39，3： | 0 |
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