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arXiv 1808.08451math.NAcs.NA
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保能量连续级 Runge-Kutta-Nyström 方法

Energy-preserving continuous-stage Runge-Kutta-Nyström methods

Wensheng Tang

AI总结:

针对二阶动力学系统传统积分器不能保持能量等不变量的问题,本文构造保能量 csRKN 方法,给出充分条件并证明其可由连续级分块 Runge-Kutta 方法导出,辅以数值验证。

摘要:

许多实际问题可以用二阶系统 $\ddot{q}=-M\nabla U(q)$ 来描述,在这些问题中,人们特别重视能量、动量、角动量等具有明确物理意义的不变量。然而,用于此类系统的传统数值积分器无法保持这些量中的任何一个,这可能导致定性上不正确的数值解。本文关注用于求解二阶系统的保能量连续级 Runge-Kutta-Nyström(csRKN)方法的发展。文中给出了 csRKN 方法保能量的充分条件,并证明满足这些充分条件的所有保能量 csRKN 方法本质上都可由保能量连续级分块 Runge-Kutta 方法导出。文中给出了若干说明性示例,并报告了相关数值结果。

英文摘要:

Many practical problems can be described by second-order system $\ddot{q}=-M\nabla U(q)$, in which people give special emphasis to some invariants with explicit physical meaning, such as energy, momentum, angular momentum, etc. However, conventional numerical integrators for such systems will fail to preserve any of these quantities which may lead to qualitatively incorrect numerical solutions. This paper is concerned with the development of energy-preserving continuous-stage Runge-Kutta-Nyström (csRKN) methods for solving second-order systems. Sufficient conditions for csRKN methods to be energy-preserving are presented and it is proved that all the energy-preserving csRKN methods satisfying these sufficient conditions can be essentially induced by energy-preserving continuous-stage partitioned Runge-Kutta methods. Some illustrative examples are given and relevant numerical results are reported.

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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