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arXiv 2004.10676math.NAcs.NA
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Stokes/Biot流体-多孔弹性结构相互作用模型的Lagrange multiplier方法的后验误差分析

A posteriori error analysis for a Lagrange multiplier method for a Stokes/Biot fluid-poroelastic structure interaction model

Koffi Wilfrid Houédanou

摘要:

本文在$d\in\{2,3\}$、$\mathbb{R}^d$的各向同性网格上,对求解多孔弹性介质中自由流体与流体相互作用耦合问题的协调混合有限元法进行了后验误差分析。该方法利用了Ilona Ambartsumyan等人在(Numerische Mathematik,2017年10月)中提出的半离散公式。后验误差估计基于对有限元解的残差的适当评估。证明了本文提出的后验误差估计是可靠和有效的。可靠性的证明利用适当的辅助问题,各种连续inf-sup条件所涉及的双线性型,Helmholtz分解,和局部逼近性质的克莱门特插值。另一方面,逆不等式和基于单纯形泡和面泡函数的局部化技术是证明估计器有效性的主要工具。只要稍加修改,我们的分析就可以推广到其它有限元子空间,从而得到稳定的Galerkin格式。

英文摘要:

In this work we develop an a posteriori error analysis of a conforming mixed finite element method for solving the coupled problem arising in the interaction between a free fluid and a fluid in a poroelastic medium on isotropic meshes in $\mathbb{R}^d$, $d\in\{2,3\}$. The approach utilizes the semi-discrete formulation proposed by Ilona Ambartsumyan et al. in (Numerische Mathematik, October 2017). The a posteriori error estimate is based on a suitable evaluation on the residual of the finite element solution. It is proven that the a posteriori error estimate provided in this paper is both reliable and efficient. The proof of reliability makes use of suitable auxiliary problems, diverse continuous inf-sup conditions satisfied by the bilinear forms involved, Helmholtz decomposition, and local approximation properties of the Clément interpolant. On the other hand, inverse inequalities, and the localization technique based on simplexe-bubble and face-bubble functions are the main tools for proving the efficiency of the estimator. Up to minor modifications, our analysis can be extended to other finite element subspaces yielding a stable Galerkin scheme.

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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