Imaginary Coating Algorithm Approaching Dense Accumulation of Granular Material in Simulations with Discrete Element Method
Imaginary Coating Algorithm Approaching Dense Accumulation of Granular Material in Simulations with Discrete Element Method
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DOI：
10.3390/powders2010014
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发表时间：
2023-03
期刊：
影响因子：
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通讯作者：
Fei Wang;Y. Huang;Chen Xuan
中科院分区：
文献类型：
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作者：
Fei Wang;Y. Huang;Chen Xuan
在颗粒材料的数值模拟中，难以获得密实堆积的颗粒材料作为初始条件是一个非常普遍的问题。介绍了一种虚拟涂层算法(ICA)。为了避免在使用较长的时间步长和较低的杨氏模数时不合理的粒子变形，用于计算二元碰撞中作用力的半径略大于实际值。换句话说，每个粒子或元素都添加了一层假想的涂层。为了验证该算法的有效性，利用äDEM进行了数值模拟，并编制了离散单元法(DEM)软件。与传统的模拟退火法(SAA)相比，该算法能够以较少的CPU/GPU时间逼近密集堆积状态，且操作简单。
The difficulty of obtaining a densely packed granular material as an initial condition is a very common problem in numerical simulations of granular materials. In this article, an Imaginary Coating Algorithm (ICA) is introduced. To avoid unreasonable particle deformation when using a longer time step and a lower Young’s modulus, the radii used in calculating the action forces in a binary collision are slightly larger than the real values. In other words, an imaginary coat is added to each particle or element. To validate this algorithm, simulations were carried out by using ÅDEM, and a A Discrete Element Method (DEM) software program was developed. Compared with traditional Simulated Annealing Algorithms (SAA), this technique can approach the densely packed state with less CPU/GPU time and is easy to operate.