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arXiv 1809.04031math.NAcs.NA
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六面体网格悬点处理的增广拉格朗日方法

Augmented Lagrangian for treatment of hanging nodes in hexahedral meshes

Saumik Dana

摘要:

在过去的十年中,在地球科学领域的精细尺度特征的分辨率活动激增,需要开发强大而简单的算法,可以解决迄今为止开发的计算机模型的各种缺点。一个这样的缺点是有限元法在将分辨率呈现到精细尺度特征时的有限计算成本,而同时保持被建模的域足够大。我们建议使用增广拉格朗日方法通常用于处理悬挂节点的接触力学在解决的缺点。在一个典型的有限元网格中引入了一个界面,在该界面上有限元的积极粗化是可能的。该方法是基于最小化的一个增广的势能的因素,在该接口上的悬挂节点处存在的约束。这允许包括网格的有限元的数量的显著减少,伴随着计算费用的减少。

英文摘要:

The surge of activity in the resolution of fine scale features in the field of earth sciences over the past decade necessitates the development of robust yet simple algorithms that can tackle the various drawbacks of in silico models developed hitherto. One such drawback is that of the restrictive computational cost of finite element method in rendering resolutions to the fine scale features, while at the same time keeping the domain being modeled sufficiently large. We propose the use of the augmented lagrangian method commonly used in the treatment of hanging nodes in contact mechanics in tackling the drawback. An interface is introduced in a typical finite element mesh across which an aggressive coarsening of the finite elements is possible. The method is based upon minimizing an augmented potential energy which factors in the constraint that exists at the hanging nodes on that interface. This allows for a significant reduction in the number of finite elements comprising the mesh with concomitant reduction in the computational expense.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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