arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2109.07320math.NAcs.NA
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随机配置有限元的误差估计和自适应性Ⅰ:单层逼近

Error estimation and adaptivity for stochastic collocation finite elements Part I: single-level approximation

Alex Bespalov, David Silvester, Feng Xu

摘要:

提出并分析了一种求解线性椭圆型偏微分方程的自适应加密策略。该自适应策略扩展了Guignard和Nyndham在2018年引入的后验误差估计框架(SIAM J. Numer.肛门,56,3121- 3143)来覆盖具有非仿射参数系数依赖性的问题。一个次优的,但仍然可靠和方便的实施策略涉及近似的解耦PDE问题与一个共同的有限元近似空间。本文(第一部分)介绍了使用这种单级策略获得的计算结果。使用一个潜在的更有效的多级近似策略,其中网格是单独定制的,将在本工作的第二部分中讨论的结果。用于生成数值结果的代码可在GitHub上获得

英文摘要:

A general adaptive refinement strategy for solving linear elliptic partial differential equation with random data is proposed and analysed herein. The adaptive strategy extends the a posteriori error estimation framework introduced by Guignard and Nobile in 2018 (SIAM J. Numer. Anal., 56, 3121--3143) to cover problems with a nonaffine parametric coefficient dependence. A suboptimal, but nonetheless reliable and convenient implementation of the strategy involves approximation of the decoupled PDE problems with a common finite element approximation space. Computational results obtained using such a single-level strategy are presented in this paper (part I). Results obtained using a potentially more efficient multilevel approximation strategy, where meshes are individually tailored, will be discussed in part II of this work. The codes used to generate the numerical results are available on GitHub

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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