用离散元模拟颗粒堆积问题  

Discrete Element Simulation on Particle Piling

作　　者：李艳洁[1] 徐泳[1] 

机构地区：[1]中国农业大学理学院,北京100083

出　　处：《农机化研究》2005年第2期57-59,共3页Journal of Agricultural Mechanization Research

基　　金：国家自然科学基金资助项目(10372113)

摘　　要：颗粒堆积是农业工程中的常见现象。堆积休止角反映了散体颗粒群综合作用的宏观特征,用离散元法研究颗粒堆积问题有助于认识堆积的细观力学机理和评估所采用模型的适用性。为此,用颗粒离散元法模拟了颗粒二维堆积问题,采用有级配的粒度分布的圆球颗粒群分析了颗粒摩擦系数、密度及粒度对堆积休止角的影响。模拟结果表明:在同等条件下,颗粒堆积的休止角随颗粒及底板摩擦系数的增大而增大,随颗粒密度的增大而减小。Piling with particulate materials is common in agricultural engineering. Angle of repose is an important macroscopic feature in characterising the interactions within an assembly of particles, therefore the study on particle piling is of great importance for understanding its microscope mechanics and evaluate the suitability of the DEM model. In this paper ‘two-dimensional’piling with multi-disperse particles were simulated using Discrete Element Method. The effects of frictions of both particle and particle arrangement on the magnitude of repose angle were studied. The numerical results show that, under identical conditions, increasing friction of particles and base wall leads to the rise of the repose angle. On the contrary, increasing density of particles will decrease the angle of repose.

关 键 词：颗粒堆积 堆积休止角 离散元法 散体力学 颗粒表面摩擦系数 颗粒密度 颗粒粒度 

分 类 号：O31[理学—一般力学与力学基础]