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arXiv 2202.08902math.NAcs.NA
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随机配置有限元的误差估计与自适应性第II部分:多层逼近

Error estimation and adaptivity for stochastic collocation finite elements Part II: multilevel approximation

Alex Bespalov, David J. Silvester

摘要:

本文提出了一种求解线性椭圆型偏微分方程的多级自适应加密策略。该策略扩展了Guignard和Neclique在2018年引入的后验误差估计框架(SIAM J. Numer. Anal,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。使用这种单级策略获得的计算结果在本工作的第一部分中给出(Bespalov,Silvester和Xu,arXiv:2109.07320)。本文讨论了使用可能更有效的多级近似策略获得的结果,其中网格是单独定制的。用于生成数值结果的代码可在线获得。

英文摘要:

A multilevel adaptive refinement strategy for solving linear elliptic partial differential equations with random data is recalled in this work. The 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 part I of this work (Bespalov, Silvester and Xu, arXiv:2109.07320). Results obtained using a potentially more efficient multilevel approximation strategy, where meshes are individually tailored, are discussed herein. The codes used to generate the numerical results are available online.

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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