arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1902.00622math.NAcs.NA
收藏

一般线性方法框架下的交替方向隐式积分

Alternating Directions Implicit Integration in a General Linear Method Framework

Arash Sarshar, Steven Roberts, Adrian Sandu

摘要:

交替方向隐式积分(ADI)是一种求解多维抛物型和椭圆型偏微分方程的算子分裂方法,它通过顺序求解一组相关的一维方程组来实现。由于分裂误差的存在,经典ADI方法的阶数最多为2。此外,当刚性一维问题的时间离散是基于Runge-Kutta格式,额外的降阶可能会发生。本文提出了一种新的ADI方法的基础上划分的一般线性方法的框架。这种方法允许构造高阶ADI方法。由于它们的高阶,所提出的方法可以减轻与其他计划看到的降阶现象。数值实验表明,这些新方法的准确性,稳定性和适用性提供了进一步的见解。

英文摘要:

Alternating Directions Implicit (ADI) integration is an operator splitting approach to solve parabolic and elliptic partial differential equations in multiple dimensions based on solving sequentially a set of related one-dimensional equations. Classical ADI methods have order at most two, due to the splitting errors. Moreover, when the time discretization of stiff one-dimensional problems is based on Runge-Kutta schemes, additional order reduction may occur. This work proposes a new ADI approach based on the partitioned General Linear Methods framework. This approach allows the construction of high order ADI methods. Due to their high stage order, the proposed methods can alleviate the order reduction phenomenon seen with other schemes. Numerical experiments are shown to provide further insight into the accuracy, stability, and applicability of these new methods.

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。

↑