真实粒子的新型离散元建模方法

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论文题目

Novel discrete element method algorithm for modeling real particle shapes

Denghui Ma ^1,2, Xun Han ¹, Yunfei Guan ¹ and Yi Tang ¹

1 Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing, China;
2 Geotechnical Research Department, College o fCivil and Transportation,

Hohai University, Nanjing, China

研究内容

Abstract:In this article, a novel three-dimensional (3D) discrete element method (DEM) algorithm is proposedfor modeling real particle shapes. First, high-precision computed tomography (CT) is usedto scan sand particles to obtain the 3D morphology of single-particle sand. Second, the backgroundgrid points and the 3D shape grid of the sand particles are generated along the x-axis.Finally, spherical particles are used to construct an overlapping model of real sand particles. Theshapes of sand particles generated via this method are accurate, and their surface shape is closeto that of real sand particles. The proposed method can also be used to generate structures ofvarious sizes and shapes, thus simplifying the modeling process in DEM simulation. The numericalsimulation results of free-falling sand particles show that the DEM model established by thismethod is effective in numerical simulation analysis.

Keywords: DEM; realistic particle shape; alpha shape algorithm; computed tomography; boundary search

FIGURE 4 CT image of sand particles.

FIGURE 6 Particle reconstruction principle.

FIGURE 14 Reconstruction of the discrete element model of sand particles.

FIGURE 19 Numerical simulation results.

了解详情

Ma, D., Han, X., Guan, Y., & Tang, Y. (2022). Novel discrete element method algorithm for modeling real particle shapes. Marine Georesources & Geotechnology,1-12.

doi:10.1080/1064119x.2022.2140317

来源：矩阵离散元MatDEM

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首次发布时间：2023-12-30