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arXiv 1701.08313math.NAcs.NA
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异质多尺度有限元方法在线弹性固体均质化中的应用及与FE$^2$方法的比较

The Heterogeneous Multiscale Finite Element Method for the Homogenization of Linear Elastic Solids and a Comparison with the FE$^2$ Method

University Siegen(锡根大学)

Bernhard Eidel, Andreas Fischer

AI总结:

本文提出基于渐近均质化的FE-HMM方法用于线弹性固体均质化,首次解决向量场问题,并与FE$^2$方法进行比较,分析收敛性、超收敛性和数值结果。

摘要:

异质多尺度有限元方法(FE-HMM)是一种基于渐近均质化的双尺度有限元方法,用于求解多尺度偏微分方程。本文提出FE-HMM用于线弹性固体在几何线性框架下的均质化,并首次解决向量场问题。FE-HMM的关键在于通过修改的四阶公式在异质微域上估计宏观刚度,从而实现微观与宏观能量密度的等价性。除了与FE$^2$方法的Hill-Mandel宏观均质性条件一致外,本文还阐述了与后者方法的比较。在开发算法框架后,我们(i)评估了现有先验收敛估计在各种范数下的微尺度和宏尺度误差,(ii)验证了基于估计的最优均匀微-宏网格细化策略,(iii)分析了FE-HMM的超收敛性质,(iv)比较了FE-HMM与FE$^2$的数值结果。

英文摘要:

The Heterogeneous Multiscale Finite Element Method (FE-HMM) is a two-scale FEM based on asymptotic homogenization for solving multiscale partial differential equations. It was introduced in [W. E and B. Engquist, \emph{Commun. Math. Sci.}, 1 (2003), 87--132]. The objective of the present work is an FE-HMM formulation for the homogenization of linear elastic solids in a geometrical linear frame, and doing so, for the first time, of a vector-valued field problem. A key ingredient of FE-HMM is that macrostiffness is estimated by stiffness sampling on heterogeneous microdomains in terms a of modified quadrature formula, which implies an equivalence of energy densities of the microscale with the macroscale. Beyond this coincidence with the Hill-Mandel macrohomogeneity condition, which is the cornerstone of the FE$^2$ method, we elaborate a conceptual comparison with the latter method. After developing an algorithmic framework we (i) assess the existing a priori convergence estimates for the micro- and macro-errors in various norms, (ii) verify optimal strategies in uniform micro-macro mesh refinements based on the estimates, (iii) analyze superconvergence properties of FE-HMM, and (iv) compare the numerical results of FE-HMM with those of FE$^2$.

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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