散粒体重力堆积的三维离散元模拟

3D DEM simulation of random packing of particulates under gravity

在随机生成的单一粒径球体堆积体模型的基础上,采用离散单元法DEM模拟以立方体为边界条件的堆积体在重力场中的重新分布,并对颗粒的运动轨迹进行了追踪。结果表明:重力作用下,堆积体更趋于均匀、致密,表现为最终堆积密度及平均配位数的增大;同时发现堆积体相对边界尺度(颗粒半径与堆积体边界长度之比)对堆积密度、配位数等计算参数影响显著。

Upon the random packing of mono-sized spherical particles in a cubic container, DEM was applied to simulate the re-location of particles in gravity field, Movement of the packing particle could also be traced during the simulation. Computed results showed that under the gravitation the packing tended to be more uniform and denser with both the ultimate density and the average coordination number increasing obviously. It was found that relative dimension of the boundary, ratio of particles radium to length of cubic container, had a significant influence on the parameters of packing density and coordination number.