IMEX peer methods for fast-wave–slow-wave problems

IMEX peer methods for fast-wave–slow-wave problems
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快波-慢波问题的 IMEX 对等方法

DOI:
10.1016/j.apnum.2017.02.016
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发表时间:
2017
影响因子:
2.8
通讯作者:
R. Weiner
R. Weiner
中科院分区:
数学2区
文献类型:
--
作者:
B. Soleimani;O. Knoth;R. Weiner

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隐-显(IMEX)方法可以有效地求解具有刚性和非刚性部分的微分方程。在文献中已经考虑了各种方法。在本文中,我们介绍IMEX对等方法。我们表明,S-阶段的显式和隐式的同行方法,都阶p的组合,给出了IMEX同行方法相同的顺序。我们构造方法的顺序p= s的s= 3,4,在那里我们计算的自由参数数值给出良好的稳定性,相对于快波-慢波问题的天气预报。我们实现这些方法,并没有步长控制。测试和比较与其他方法的问题,主要是从天气预报显示IMEX同行方法的高潜力。
Differential equations with both stiff and nonstiff parts can be solved efficiently by implicit–explicit (IMEX) methods. There have been considered various approaches in the literature. In this paper we introduce IMEX peer methods. We show that the combination of s-stage explicit and implicit peer methods, both of order p, gives an IMEX peer method of the same order. We construct methods of order p= s for s= 3, 4, where we compute the free parameters numerically to give good stability with respect to fast-wave–slow-wave problems from weather prediction. We implement these methods with and without step size control. Tests and comparisons with other methods for problems mostly from weather prediction show the high potential of IMEX peer methods.
具有优化稳定区域的基于外推的隐式-显式对等方法
DOI: 10.1016/j.jcp.2017.02.034
发表时间: 2017
期刊: J. Comput. Phys.
影响因子: --
作者:
Lang J;Hundsdorfer W
通讯作者: Hundsdorfer W