密集颗粒流动的连续性方法应用研究  

Application of Continuum Modeling of Dense Granular Flow

作　　者：孙倩 彭天骥 严安 周志伟[1] SUN Qian;PENG Tianji;YAN An;ZHOU Zhiwei(Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,China;Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[1]清华大学核能与新能源技术研究院,北京100084 [2]中国科学院近代物理研究所,甘肃兰州730000

出　　处：《原子能科学技术》2019年第12期2367-2374,共8页Atomic Energy Science and Technology

摘　　要：颗粒流动广泛存在于自然现象和工程应用中,无论是山体坍塌还是工程上球床模块式高温气冷堆和中国科学院近代物理研究所提出的新型流态固体颗粒靶概念。本文基于适用于处理大变形问题的物质点法(MPM),采用μ(I)流变模型,实现了用连续性方法模拟密集颗粒流动的计算框架,并模拟了颗粒坍塌实验和漏斗流动现象,数值模拟结果与实验结果、DEM计算结果均吻合较好。本文采用的连续性本构和MPM能有效模拟密集颗粒流动。可在本文探究的连续性方法模拟密集颗粒流动的框架基础上,完善边界条件和本构模型,为用连续性方法处理大量颗粒的工程问题提供借鉴。Granular flows are pretty common in natural phenomena and industrial applications,such as landslides,pebble-bed reactors and the gravity-driven dense granular flow target(DGT)in accelerator driven sub-critical system(ADS).Based on the μ(I) rheology model,a material point method(MPM)procedure was chosen for the simulation of the dense granular flow.By using the MPM framework,the granular collapse problem and the hopper flow were investigated.The method was verified by experimental and DEM results.The result shows that the modeling and numerical approach described in this article can capture the granular solid and fluid behavior and could be extended to more complex industrial applications.

关 键 词：密集颗粒流 μ(I)流变模型 物质点法 颗粒坍塌 固体颗粒靶 

分 类 号：O344.3[理学—固体力学]