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arXiv 2209.15431math.NAcs.NA
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一种离散收敛的Level-Set-DEM

A discretization-convergent Level-Set-DEM

Shai Feldfogel, Konstantinos Karapiperis, Jose Andrade, David S. Kammer

摘要:

最近发展起来的水平集DEM能够无缝地处理任意形状的颗粒及其接触,通过离散的水平集表示的颗粒的体积和基于节点的离散化的边界表面。因此,LS-DEM与这些离散化的细化的收敛性能没有被检查。在这里,我们研究这些属性,并表明,原来的LS-DEM分歧后,表面离散细化,由于其基于力的离散接触配方。接下来,我们通过采用基于连续体的接触公式来解决这个问题,其中接触相互作用是基于牵引力的,并且表明适应的LS-DEM是完全离散化收敛的。最后,我们讨论了收敛在捕获物理响应中的重要性,以及其他一些具有实际意义的收敛相关主题。

英文摘要:

The recently developed level-set-DEM is able to seamlessly handle arbitrarily shaped grains and their contacts through a discrete level-set representation of grains' volume and a node-based discretization of their bounding surfaces. Heretofore, the convergence properties of LS-DEM with refinement of these discretizations have not been examined. Here, we examine these properties and show that the original LS-DEM diverges upon surface discretization refinement due to its force-based discrete contact formulation. Next, we fix this issue by adopting a continuum-based contact formulation wherein the contact interactions are traction-based, and show that the adapted LS-DEM is fully discretization convergent. Lastly, we discuss the significance of convergence in capturing the physical response, as well as a few other convergence-related topics of practical importance.

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