A deformable spheropolygon-based discrete element method
A deformable spheropolygon-based discrete element method
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DOI：
10.1007/s00419-021-02068-z
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发表时间：
2021-11
影响因子：
2.8
通讯作者：
Lanhao Zhao;Linyu Shao;Jia Mao;Xunnan Liu
中科院分区：
文献类型：
--
作者：
Lanhao Zhao;Linyu Shao;Jia Mao;Xunnan Liu
结合基于球面多边形的离散元方法（DEM）和有限元方法，开发了一种基于可变形球面多边形的离散元方法（DS-DEM）来研究可变形粒子的行为。在DS-DEM框架下，开发了一种改进的切向接触力计算算法。此外，提出了一种有效的接触检测算法，以提高非均匀粒子的整体计算效率。该方法克服了基于球面DEM基于刚体假设的缺陷，可用于模拟多个可变形粒子的运动过程。最后，包括单元填充模拟、摩擦测试、梁的动态响应、多体接触和料斗流动测试在内的数值模拟结果表明，这种新方法在捕获颗粒的碰撞、分离和变形等物理机械现象方面具有通用性。
A deformable spheropolygon-based discrete element method (DS-DEM) that combines the spheropolygon-based discrete element method (DEM) and the finite element method is developed to study behaviors of the deformable particles. Under the framework of the DS-DEM, an improved computational algorithm of the tangential contact force is developed. Moreover, an efficient contact detection algorithm is proposed to enhance the overall calculation efficiency for non-uniform particles. The proposed approach overcomes the defect of the spheropolygon-based DEM which is based on the rigid body assumption and can be used to simulate the movement procedure of multiple deformable particles. Finally, the results of numerical simulations including the element packing simulation, friction tests, the dynamic response of the beam, multi-body contact, and hopper flow test indicate that this novel method is versatile in capturing the physical and mechanical phenomena of particles including collision, separation, and deformation.