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arXiv 2601.04075math.NAcs.NA
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一种高阶稀疏网格组合技术

A higher order sparse grid combination technique

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

Julia Muñoz-Echániz, Christoph Reisinger

AI总结:

本文提出一种高阶稀疏网格组合技术,通过结合有限差分外推与标准组合公式,将二阶方案提升至四阶精度,适用于高维问题。

摘要:

我们展示了一种通用的稀疏网格组合技术,该技术结合了有限差分解的多变量外推与标准组合公式,将常规网格上的二阶准确方案提升为四阶联合稀疏网格解。在分析中,我们在一般维度下,将方案的多变量误差展开中的所有项都刻画为一系列半离散问题的解。这是在适当假设下首次形式上进行的,这些假设涉及方案的截断误差、解的稳定性及正则性。我们随后在泊松问题具有光滑数据的情况下验证了这些假设,并展示了在最高七维中的实际收敛性。

英文摘要:

We show that a generalised sparse grid combination technique which combines multi-variate extrapolation of finite difference solutions with the standard combination formula lifts a second order accurate scheme on regular meshes to a fourth order combined sparse grid solution. In the analysis, working in a general dimension, we characterise all terms in a multivariate error expansion of the scheme as solutions of a sequence of semi-discrete problems. This is first carried out formally under suitable assumptions on the truncation error of the scheme, stability and regularity of solutions. We then verify the assumptions on the example of the Poisson problem with smooth data, and illustrate the practical convergence in up to seven 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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