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arXiv 1806.01931math.NAcs.NA
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面向非匹配网格界面的守序插值求和-由-部分差分方法

Order Preserving Interpolation for Summation-by-Parts Operators at Non-Conforming Grid Interfaces

Stanford University(斯坦福大学);Chalmers University of Technology(查尔姆斯理工大学);University of Gothenburg(哥德堡大学);Uppsala University(乌普萨拉大学)

Martin Almquist, Siyang Wang, Jonatan Werpers

AI总结:

本文研究了应用于具有空间二阶导数的偏微分方程的求和-由-部分差分方法的非匹配网格界面,通过通用化的界面处理和引入守序插值算子避免了全局收敛率的降低,保证了非匹配界面下的稳定性与全局精度。

摘要:

我们研究了应用于具有空间二阶导数的偏微分方程的求和-由-部分差分方法的非匹配网格界面。为了保持能量稳定性,先前的努力被迫接受全局收敛率降低一个阶的妥协,因为非匹配界面处的截断误差较大。我们通过通用化的界面处理和引入守序插值算子来避免收敛率的降低。我们证明,给定两个对角范数的求和-由-部分差分方案,只要满足必要条件,守序插值算子就保证存在,无论界面沿网格点分布如何。新的方法在非匹配界面下保留了底层方案的稳定性与全局精度特性。

英文摘要:

We study non-conforming grid interfaces for summation-by-parts finite difference methods applied to partial differential equations with second derivatives in space. To maintain energy stability, previous efforts have been forced to accept a reduction of the global convergence rate by one order, due to large truncation errors at the non-conforming interface. We avoid the order reduction by generalizing the interface treatment and introducing order preserving interpolation operators. We prove that, given two diagonal-norm summation-by-parts schemes, order preserving interpolation operators with the necessary properties are guaranteed to exist, regardless of the grid-point distributions along the interface. The new methods retain the stability and global accuracy properties of the underlying schemes for conforming interfaces.

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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