arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2203.00944math.NAcs.NA
收藏

保二次不变量的高阶线性隐格式

High-order linearly implicit schemes conserving quadratic invariants

Shun Sato, Yuto Miyatake, John C. Butcher

摘要:

本文对具有二次不变量的常微分方程提出了线性隐式的任意高阶守恒数值格式。许多微分方程都有不变量,因此保持不变量的数值格式得到了广泛的研究。由于线性不变量可以很容易地保持离散化后,二次不变量本质上是最简单的。二次不变量不仅出现在许多物理实例中,而且也出现在近年来研究的标量辅助变量方法等计算效率高的一般不变量守恒格式中。已知二次不变量与一般不变量相比可以相对容易地保持,并且确实可以通过规范龙格-库塔法来保持。然而,对于线性隐式和高阶守恒格式的构造,目前还没有统一的方法。在本文中,我们构造这样的计划的基础上规范的龙格-库塔法,并证明了一些性质,涉及精度。

英文摘要:

In this paper, we propose linearly implicit and arbitrary high-order conservative numerical schemes for ordinary differential equations with a quadratic invariant. Many differential equations have invariants, and numerical schemes for preserving them have been extensively studied. Since linear invariants can be easily kept after discretisation, quadratic invariants are essentially the simplest ones. Quadratic invariants are important objects that appear not only in many physical examples but also in the computationally efficient conservative schemes for general invariants such as scalar auxiliary variable approach, which have been studied in recent years. It is known that quadratic invariants can be kept relatively easily compared to general invariants, and indeed can be preserved by canonical Runge--Kutta methods. However, there is no unified method for constructing linearly implicit and high order conservative schemes. In this paper, we construct such schemes based on canonical Runge--Kutta methods and prove some properties involving accuracy.

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。

↑