Abstract The computational cost of using discrete element method (DEM) simulations for particulate processes with fine and cohesive particles is enormously large. To overcome this limitation, various coarse-grain DEM models have been developed which use a smaller number of larger sized particles. Although the computational cost is significantly reduced, the accuracy of the simulations depends on the underlying scaling law. We propose a scaling of the Johnson-Kendall-Roberts (JKR) contact model for adhesive viscoelastic particles. A scaling law using a single Bond number or Cohesion number criterion is insufficient to keep the motion of the coarse-grained particles the same as the original particles. The scaling law in this work is developed based on mass, momentum and energy conservation, and achieves good consistency between the kinematic characteristics of the coarse-grained and original particles. The simulated effective coefficients of restitution were compared for a range of particle-wall impact velocities and validated against experimental data.

中文翻译：

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粗粒粘性粒子JKR接触模型的标度规律

摘要 使用离散元法 (DEM) 模拟具有细小和内聚颗粒的颗粒过程的计算成本非常大。为了克服这个限制，已经开发了各种粗粒 DEM 模型，它们使用较少数量的较大尺寸的颗粒。尽管计算成本显着降低，但模拟的准确性取决于基本的缩放定律。我们提出了对粘弹性颗粒的 Johnson-Kendall-Roberts (JKR) 接触模型的缩放。使用单一键数或内聚数标准的标度定律不足以使粗粒粒子的运动与原始粒子相同。这项工作中的标度定律是基于质量、动量和能量守恒发展起来的，并在粗粒和原始颗粒的运动学特征之间实现了良好的一致性。模拟的有效恢复系数在一系列颗粒壁冲击速度下进行了比较，并根据实验数据进行了验证。