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arXiv 2110.04092math.NAcs.NA
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多分量哈密顿系统的高效保能指数积分器

Efficient energy-preserving exponential integrators for multi-components Hamiltonian systems

X. Gu, C. Jiang, Y. Wang, W. Cai

摘要:

在本文中,我们开发了一个框架,以建立多个组件哈密顿系统的能量保持方法,结合指数积分和分区平均向量场方法。这导致数值计划的长期稳定性和高振荡或刚性问题的优良性能的优点。与现有的能量保持指数积分器(EP-EI)相比,本文提出的方法至少可以分子系统计算,而不是一次处理一个非线性耦合系统。而且,对于大多数情况,如本文所考虑的Klein-Gordon-薛定谔方程和Klein-Gordon-Zakharov方程,计算量可以进一步降低。具体地说,所导出的格式的一部分是完全显式的,另一部分是线性隐式的。此外,我们提出了严格的证明保存原始能量的哈密顿系统,其中一种替代技术是利用,使不需要额外的假设,在现有的EP-EI使用的证明策略。数值实验证明了该方法在精度、计算效率和捕获高振荡解方面的显著优势。

英文摘要:

In this paper, we develop a framework to construct energy-preserving methods for multi-components Hamiltonian systems, combining the exponential integrator and the partitioned averaged vector field method. This leads to numerical schemes with both advantages of long-time stability and excellent behavior for highly oscillatory or stiff problems. Compared to the existing energy-preserving exponential integrators (EP-EI) in practical implementation, our proposed methods are much efficient which can at least be computed by subsystem instead of handling a nonlinear coupling system at a time. Moreover, for most cases, such as the Klein-Gordon-Schrödinger equations and the Klein-Gordon-Zakharov equations considered in this paper, the computational cost can be further reduced. Specifically, one part of the derived schemes is totally explicit, and the other is linearly implicit. In addition, we present rigorous proof of conserving the original energy of Hamiltonian systems, in which an alternative technique is utilized so that no additional assumptions are required, in contrast to the proof strategies used for the existing EP-EI. Numerical experiments are provided to demonstrate the significant advantages in accuracy, computational efficiency, and the ability to capture highly oscillatory solutions.

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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