A novel non-overlapping approach to accurately represent 2D arbitrary particles for DEM modelling

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• 作者：Qiang Zhang 张强 ; Wei-ya Xu 徐卫亚 ; Qin-ya Liu 刘沁雅…
• 关键词：Key wordsdiscrete element method (DEM) ; composite approaches ; arbitrary particles ; clusters ; non ; overlapping disks
• 刊名：Journal of Central South University
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：24
• 期：1
• 页码：190-202
• 全文大小：
• 刊物类别：Engineering
• 刊物主题：Engineering, general; Metallic Materials;
• 出版者：Central South University
• ISSN：2227-5223
• 卷排序：24

文摘

Mechanical behaviors of granular materials are complicated and greatly influenced by the particle shape. Current, some composite approaches have been proposed for realistic particle shape modelling within discrete element method (DEM), while they cannot give a good representation to the shape and mass properties of a real particle. In this work, a novel algorithm is developed to model an arbitrary particle using a cluster of non-overlapping disks. The algorithm mainly consists of two components: boundary filling and domain filling. In the boundary filling, some disks are placed along the boundary for a precise representation of the particle shape, and some more disks are placed in the domain to give an approximation to the mass properties of the particle in the domain filling. Besides, a simple method is proposed to correct the mass properties of a cluster after domain filling and reduce the number of the disks in a cluster for lower computational load. Moreover, it is another great merit of the algorithm that a cluster generated by the algorithm can be used to simulate the particle breakage because of no overlaps between the disks in a cluster. Finally, several examples are used to show the robust performance of the algorithm. A current FORTRAN version of the algorithm is available by contacting the author.