An overlappable coarsening strategy for discrete element method simulations of bi-disperse granular flows
发布时间：2025-03-09
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所属单位：中南大学
发表刊物：Powder Technology
关键字：Bi-disperse granular flows Fluidized bed CFD-DEM Coarse-graining
摘要：The coarsening strategy provides a promising avenue for industrial applications of the discrete element method by profoundly reducing computational costs. However, its application in multi-particle-size systems often results in underestimations of the packing solid volume fraction when employing different coarsening ratios. To address this issue, we propose a novel overlappable coarse-grained model specifically designed for bi-disperse systems. In this model, particles are allowed to overlap to a certain extent without experiencing collision forces, with the degree of overlapping described by an overlapping coefficient. This coefficient is determined through fitting discrete element method simulation of bi-disperse packings. Posterior analyses reveal that the traditional coarse-grained discrete element method significantly underpredicts the packing solid volume fraction and consequently the segregation behavior. In contrast, our proposed overlappable coarsening strategy accurately predicts both the packing solid volume fraction and segregation behavior when employing the fitted overlapping coefficient.
论文类型：期刊论文
卷号：455
页面范围：120765
是否译文：否
发表时间：2025-02-08
收录刊物：SCI
附件：
An overlappable coarsening strategy for discrete element method.pdf