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arXiv 1807.01044math.NAcs.NA
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高振荡哈密顿系统中总能量守恒方法的长期振荡能量守恒

Long-time oscillatory energy conservation of total energy-preserving methods for highly oscillatory Hamiltonian systems

Qufu Normal University(曲阜师范大学);University of Tübingen(蒂宾根大学);Nanjing University(南京大学)

Bin Wang, Xinyuan Wu

AI总结:

本文研究了平均向量场方法在高振荡哈密顿系统中的长期振荡能量近似守恒性质,通过构造调制傅里叶展开并推导近不变量,分析了该方法的长期能量守恒特性。

摘要:

对于应用于高振荡系统的积分器,长时间内振荡能量的近似守恒是一个重要特性。本文研究了平均向量场(AAVF)方法应用于高振荡哈密顿系统时的长期振荡能量近似守恒性质。该AAVF方法是平均向量场方法的扩展,能精确保持高振荡哈密顿系统总能量。本文致力于分析AAVF方法的另一个重要性质,即其在长期内的振荡能量近似守恒。通过构造AAVF方法的调制傅里叶展开并推导展开的近不变量,实现了长期振荡能量的守恒。本文还展示了该方法在多频率情况下的类似结果。

英文摘要:

For an integrator when applied to a highly oscillatory system, the near conservation of the oscillatory energy over long times is an important aspect. In this paper, we study the long-time near conservation of oscillatory energy for the adopted average vector field (AAVF) method when applied to highly oscillatory Hamiltonian systems. This AAVF method is an extension of the average vector field method and preserves the total energy of highly oscillatory Hamiltonian systems exactly. This paper is devoted to analysinganother important property of AAVF method, i.e., the near conservation of its oscillatory energy in a long term. The long-time oscillatory energy conservation is obtained via constructing a modulated Fourier expansion of the AAVF method and deriving an almost invariant of the expansion. A similar result of the method in the multi-frequency case is also presented in this paper.

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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