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arXiv 1503.05040math.NAcs.NA
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线弹性问题中一种中心化有限体积离散格式的收敛性

Convergence of a cell-centered finite volume discretization for linear elasticity

University of Bergen(卑尔根大学);Princeton University(普林斯顿大学)

Jan Martin Nordbotten

AI总结:

本文研究了线弹性问题中中心化有限体积离散格式的收敛性,通过混合变分公式分析,提出新的稳定化方法,并建立了全局离散的Korn不等式,证明了该方法在泊松比下的鲁棒性。

摘要:

我们展示了线弹性问题中一种中心化有限体积离散格式(称为MPSA方法)的收敛性。该离散格式最近在地质应用中被提出,其中中心化变量常被优先使用。我们的分析利用了一种混合变分公式,该公式之前用于分析标量扩散方程的有限体积离散格式。当前分析在三个方面与之前的分析有显著不同。首先,额外的稳定化导致更复杂的对偶问题。其次,必须为全局离散建立离散的Korn不等式。最后,分析了对泊松比的鲁棒性。本文所呈现的稳定性与收敛性结果为中心化有限体积方法应用于线弹性问题提供了首次严谨的合理性证明。

英文摘要:

We show convergence of a cell-centered finite volume discretization for linear elasticity. The discretization, termed the MPSA method, was recently proposed in the context of geological applications, where cell-centered variables are often preferred. Our analysis utilizes a hybrid variational formulation, which has previously been used to analyze finite volume discretizations for the scalar diffusion equation. The current analysis deviates significantly from previous in three respects. First, additional stabilization leads to a more complex saddle-point problem. Secondly, a discrete Korn's inequality has to be established for the global discretization. Finally, robustness with respect to the Poisson ratio is analyzed. The stability and convergence results presented herein provide the first rigorous justification of the applicability of cell-centered finite volume methods to problems in linear elasticity.

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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