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arXiv 2202.13052math.NAcs.NA
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量子Zakharov系统的任意高阶保结构方法

Arbitrary high-order structure-preserving methods for the quantum Zakharov system

Gengen Zhang, Chaolong Jiang

AI总结:

本文提出一种求解量子Zakharov系统的任意高阶保结构方法,通过引入二次辅助变量重构Hamiltonian能量,结合辛Runge-Kutta与Fourier伪谱方法离散,实现时间任意高阶精度并精确保持质量与能量。

摘要:

本文提出了一种新方法,用于构建求解量子Zakharov系统的任意高阶保结构方法。该方法的核心要素包括:(i) 通过引入新的二次辅助变量,将原始Hamiltonian能量重构为二次型;(ii) 基于能量变分原理,将原系统重写为一个新的等价系统,该系统继承质量守恒律和二次能量;(iii) 对所得系统在时间上采用辛Runge-Kutta方法,在空间上结合Fourier伪谱方法进行离散。所提方法在时间上达到任意高阶精度,并能精确保持离散质量和原始Hamiltonian能量。此外,还提出了一种高效的迭代求解器来求解所得的离散非线性方程。最后,给出了充分的数值算例以验证理论声明并展示方法的效率。

英文摘要:

In this paper, we present a new methodology to develop arbitrary high-order structure-preserving methods for solving the quantum Zakharov system. The key ingredients of our method are: (i) the original Hamiltonian energy is reformulated into a quadratic form by introducing a new quadratic auxiliary variable; (ii) based on the energy variational principle, the original system is then rewritten into a new equivalent system which inherits the mass conservation law and a quadratic energy; (iii) the resulting system is discretized by symplectic Runge-Kutta method in time combining with the Fourier pseudo-spectral method in space. The proposed method achieves arbitrary high-order accurate in time and can preserve the discrete mass and original Hamiltonian energy exactly. Moreover, an efficient iterative solver is presented to solve the resulting discrete nonlinear equations. Finally, ample numerical examples are presented to demonstrate the theoretical claims and illustrate the efficiency of our 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。

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