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arXiv 1809.01770math.NAcs.NA
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用连续级方法对非正则哈密顿系统进行能量保持积分

Energy-preserving integration of non-canonical Hamiltonian systems by continuous-stage methods

Wensheng Tang

AI总结:

针对非正则哈密顿系统,本文基于连续级方法给出能量保持、对称及二次 Casimir 保持的 Butcher 系数条件,并构造一类对称的 $2m$ 阶能量保持积分器。

摘要:

众所周知,在许多保守问题中,能量通常被认为是最重要的物理不变量之一,因此考虑能够保持能量的数值方法具有显著意义。本文关注利用连续级方法对非正则哈密顿系统进行能量保持积分。文中给出了分别以 Butcher 系数表示、用于确保能量保持、对称性和二次 Casimir 保持的代数条件。利用所提出的条件并借助正交展开技术,考察了能量保持积分器的构造。构造了一类新的、具有对称性且阶数为 $2m$ 的能量保持积分器。文中报告了一些数值结果,以验证我们的理论分析并展示新方法的有效性。

英文摘要:

As is well known, energy is generally deemed as one of the most important physical invariants in many conservative problems and hence it is of remarkable interest to consider numerical methods which are able to preserve it. In this paper, we are concerned with the energy-preserving integration of non-canonical Hamiltonian systems by continuous-stage methods. Algebraic conditions in terms of the Butcher coefficients for ensuring the energy preservation, symmetry and quadratic-Casimir preservation respectively are presented. With the presented condition and in use of orthogonal expansion techniques, the construction of energy-preserving integrators is examined. A new class of energy-preserving integrators which is symmetric and of order $2m$ is constructed. Some numerical results are reported to verify our theoretical analysis and show the effectiveness of our 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。

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