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arXiv 2103.00414math.NAastro-ph.HEcs.NAphysics.comp-ph
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有限差分法的一种无系统递推单步时间离散方法

A recursive system-free single-step temporal discretization method for finite difference methods

Youngjun Lee, Dongwook Lee, Adam Reyes

摘要:

单阶段或单步高阶时间离散的偏微分方程(PDE)已显示出很大的希望,提供高阶精度的时间与有效地利用计算资源。已经有很多成功的发展,这种方法的有限体积法(FVM)离散偏微分方程。Picard积分公式(PIF)最近使得这种单阶段时间方法可用于有限差分法(FDM)离散化。PIF方法依赖于所谓的Lax-Wendroff过程,通过控制PDE系统将空间和时间导数紧密耦合,以构建时间上的高阶泰勒级数展开。在时间上达到高于三阶需要计算越来越大程度的雅可比类导数张量向量收缩,大大增加了这种方案的复杂性。为此,我们在本文中提出了一种方法来计算这些张量收缩通过递归应用的离散雅可比算子,容易和有效地计算所需的收缩完全不可知的偏微分方程(PDE)的系统正在解决。

英文摘要:

Single-stage or single-step high-order temporal discretizations of partial differential equations (PDEs) have shown great promise in delivering high-order accuracy in time with efficient use of computational resources. There has been much success in developing such methods for finite volume method (FVM) discretizations of PDEs. The Picard Integral formulation (PIF) has recently made such single-stage temporal methods accessible for finite difference method (FDM) discretizations. PIF methods rely on the so-called Lax-Wendroff procedures to tightly couple spatial and temporal derivatives through the governing PDE system to construct high-order Taylor series expansions in time. Going to higher than third order in time requires the calculation of Jacobian-like derivative tensor-vector contractions of an increasingly larger degree, greatly adding to the complexity of such schemes. To that end, we present in this paper a method for calculating these tensor contractions through a recursive application of a discrete Jacobian operator that readily and efficiently computes the needed contractions entirely agnostic of the system of partial differential equations (PDEs) being solved.

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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