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arXiv 1908.00253math.NAcs.NA
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对数正态随机场Karhunen-Loève展开式的数值逼近

On the Numerical Approximation of the Karhunen-Loève Expansion for Lognormal Random Fields

Michael Griebel, Guanglian Li

摘要:

Karhunen-Loève(KL)展开是一种将无限维随机域变换到有限维参数空间来逼近随机场的常用方法。它的数值逼近对于随机系数偏微分方程的研究具有重要意义。本文分析了对数正态随机场的Karhunen-Loève展开式的逼近误差。我们得到的误差估计,允许最佳平衡的截断误差的扩展,拟蒙特卡罗方法误差采样在随机域和物理域中的数值逼近错误。该估计值以KL展开中保留的项的数量$M$、采样点的数量$N$以及在展开期间的本征值问题的数值解中采用的物理域中的离散化网格大小$h$给出。结果被用来量化随机系数偏微分方程的误差。我们完成了理论分析与数值实验在一个和多个随机维度。

英文摘要:

The Karhunen-Loève (KL) expansion is a popular method for approximating random fields by transforming an infinite-dimensional stochastic domain into a finite-dimensional parameter space. Its numerical approximation is of central importance to the study of PDEs with random coefficients. In this work, we analyze the approximation error of the Karhunen-Loève expansion for lognormal random fields. We derive error estimates that allow the optimal balancing of the truncation error of the expansion, the Quasi Monte-Carlo error for sampling in the stochastic domain and the numerical approximation error in the physical domain. The estimate is given in the number $M$ of terms maintained in the KL expansion, in the number of sampling points $N$, and in the discretization mesh size $h$ in the physical domain employed in the numerical solution of the eigenvalue problems during the expansion. The result is used to quantify the error in PDEs with random coefficients. We complete the theoretical analysis with numerical experiments in one and multiple stochastic dimensions.

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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