arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0710.0491math.NAcs.NA
收藏

稀疏网格组合技术中线性差分格式的分析

Analysis of Linear Difference Schemes in the Sparse Grid Combination Technique

Mathematical Institute, University of Oxford(牛津大学数学研究所)

Christoph Reisinger

AI总结:

本文通过半离散化的误差校正技术推导线性差分格式的多元误差展开,证明稀疏网格组合技术达到$\mathcal{O}(h^p |\log h|^{d-1})$收敛阶,并通过高达八维的线性和抛物问题数值算例验证了维度与光滑性的影响。

摘要:

稀疏网格专为光滑高维函数的逼近而设计。在$d$维张量积空间上,网格点数为$N = \mathcal O(h^{-1} |\log h|^{d-1})$,其中$h$是网格参数。所谓的组合技术基于层次分解和外推,需要笛卡尔网格上离散误差的特定多元误差展开成立。我们通过半离散化的误差校正技术推导了线性差分格式的此类误差展开。我们得到了形如$\varepsilon= \mathcal{O} (h^p |\log h|^{d-1})$的整体误差公式,并通过线性椭圆和抛物问题的例子分析了收敛性及其对维度和光滑性的依赖,数值示例高达八维。

英文摘要:

Sparse grids are tailored to the approximation of smooth high-dimensional functions. On a $d$-dimensional tensor product space, the number of grid points is $N = \mathcal O(h^{-1} |\log h|^{d-1})$, where $h$ is a mesh parameter. The so-called combination technique, based on hierarchical decomposition and extrapolation, requires specific multivariate error expansions of the discretisation error on Cartesian grids to hold. We derive such error expansions for linear difference schemes through an error correction technique of semi-discretisations. We obtain overall error formulae of the type $ε= \mathcal{O} (h^p |\log h|^{d-1})$ and analyse the convergence, with its dependence on dimension and smoothness, by examples of linear elliptic and parabolic problems, with numerical illustrations in up to eight 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。

↑