| A hybrid DEM/CFD approach for solid-liquid flows简 |
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| 引用本文： | 邱流潮,WU Chuan-yu.A hybrid DEM/CFD approach for solid-liquid flows简[J].水动力学研究与进展(英文版),2014,26(1):19-25. |
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| 作者姓名： | 邱流潮 WU Chuan-yu |
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| 基金项目： | Project supported by the National Natural Science Foundation of China （Grant No. 11172321）. |
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| 摘 要： | A hybrid scheme coupling the discrete element method(DEM)with the computational fluid dynamics(CFD)is developed to model solid-liquid flows.Instead of solving the pressure Poisson equation,we use the compressible volume-averaged continuity and momentum equations with an isothermal stiff equation of state for the liquid phase in our CFD scheme.The motion of the solid phase is obtained by using the DEM,in which the particle-particle and particle-wall interactions are modelled by using the theoretical contact mechanics.The two phases are coupled through the Newton’s third law of motion.To verify the proposed method,the sedimentation of a single spherical particle is simulated in water,and the results are compared with experimental results reported in the literature.In addition,the drafting,kissing,and tumbling(DKT)phenomenon between two particles in a liquid is modelled and reasonable results are obtained.Finally,the numerical simulation of the density-driven segregation of a binary particulate suspension involving 10 000 particles in a closed container is conducted to show that the presented method is potentially powerful to simulate real particulate flows with large number of moving particles.
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| 关 键 词： | CFD方法 DEM 混合 液流 计算流体动力学 球形颗粒 数值模拟 运动定律 |
| 收稿时间： | 24 May 2013 |
A hybrid DEM/CFD approach for solid-liquid flows |
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| Institution: | [1]College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China [2] Department of Chemical and Process Engineering, University of Surrey, Guildford, Surrey, GU2 7XH, UK |
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| Abstract: | A hybrid scheme coupling the discrete element method (DEM) with the computational fluid dynamics (CFD) is developed to model solid-liquid flows. Instead of solving the pressure Poisson equation, we use the compressible volume-averaged continuity and momentum equations with an isothermal stiff equation of state for the liquid phase in our CFD scheme. The motion of the solid phase is obtained by using the DEM, in which the particle-particle and particle-wall interactions are modelled by using the theoretical contact mechanics. The two phases are coupled through the Newton's third law of motion. To verify the proposed method, the sedimentation of a single spherical particle is simulated in water, and the results are compared with experimental results reported in the literature. In addition, the drafting, kissing, and tumbling (DKT) phenomenon between two particles in a liquid is modelled and reasonable results are obtained. Finally, the numerical simulation of the density-driven segregation of a binary particulate suspension involving 10 000 particles in a closed container is conducted to show that the presented method is potentially powerful to simulate real particulate flows with large number of moving particles. |
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| Keywords: | discrete element method （DEM） computational fluid dynamics （CFD） |
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