Fully implicit discrete element method for granular column collapse
Fully implicit discrete element method for granular column collapse
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DOI：
10.1007/s40571-022-00485-7
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发表时间：
2022-07
影响因子：
3.3
通讯作者：
H. Ikari;H. Gotoh
中科院分区：
文献类型：
--
作者：
H. Ikari;H. Gotoh
本文讨论了一种全隐式离散元方法的发展及其在颗粒柱坍塌模拟中的应用。在所开发的模型中，平移和角速度求解隐式和同时进行。通过模拟单个颗粒在平坦表面上弹跳和在斜坡上滚动来验证该模型;然后通过使用多个颗粒的颗粒柱倒塌模拟来验证该模型。验证表明，由计算结果估算的颗粒与底面间的恢复系数与输入参数的恢复系数基本一致，颗粒在斜坡上的平动速度和角速度的时间序列变化也与理论值完全一致。在颗粒柱倒塌模拟中，所提出的模型相对于倒塌的颗粒柱的跳动距离和沉积形状的性能进行了研究，与以前的实验相比。通过改变颗粒柱的初始长径比，对10种情况进行了模拟，计算结果与实验结果吻合较好。
This paper discusses the development of a fully implicit discrete element method and its application to granular column collapse simulations. In the developed model, both the translational and angular velocities are solved implicitly and simultaneously. The model is verified by simulating a single particle bouncing on a flat surface and rolling on a slope; it is then validated through a granular column collapse simulation using many particles. The verification indicates that the restitution coefficient between the particle and the bottom surface estimated from the calculated results generally agrees with that of an input parameter, and the time-series variations of the translational and angular velocities of the particle on a slope are also in perfect agreement with the theoretical values. In the granular column collapse simulation, the performance of the proposed model with respect to the runout distance and deposition shape of the collapsed granular column is investigated in comparison to a previous experiment. The simulations are conducted for a total of ten cases by varying the initial aspect ratios of the granular column, and the calculated results are found to agree well with the experimental results.