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arXiv nlin/0502016nlin.AOnlin.PS
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耦合振子动力学的无方程方法:仓本模型的例子

An equation-free approach to coupled oscillator dynamics: the Kuramoto model example

Sung Joon Moon, Ioannis G. Kevrekidis

摘要:

我们提出了一个无方程的多尺度方法来计算研究仓本模型[{ \it Chemical Oscillations,Waves,and Turbulence},Springer-Verlag(1984)]的集体动力学,仓本模型是耦合振子种群的原型模型。我们的研究发生在一个减少的相空间的粗粒度的“可观”的系统:振荡器相位角分布的前几个时刻。我们避开了(近似)控制这些粗粒度宏观变量演化的显式动力学方程的推导;相反,我们使用{ \it无方程框架} [Kevrekidis { \it et al.},{ \it通信数学科学} { \bf 1}(4),715(2003)]来计算地求解这些方程,而不以封闭形式获得它们。在这种方法中,数值任务的概念上现有的,但不可用的粗粒度方程实现通过适当的初始化模拟的“细尺度”,详细的耦合振荡器模型的短脉冲串。说明了粗投影积分和粗不动点计算。

英文摘要:

We present an equation-free multi-scale approach to the computational study of the collective dynamics of the Kuramoto model [{\it Chemical Oscillations, Waves, and Turbulence}, Springer-Verlag (1984)], a prototype model for coupled oscillator populations. Our study takes place in a reduced phase space of coarse-grained "observables" of the system: the first few moments of the oscillator phase angle distribution. We circumvent the derivation of explicit dynamical equations (approximately) governing the evolution of these coarse-grained macroscopic variables; instead we use the {\it equation-free framework} [Kevrekidis {\it et al.}, {\it Comm. Math. Sci.} {\bf 1}(4), 715 (2003)] to computationally solve these equations without obtaining them in closed form. In this approach, the numerical tasks for the conceptually existing but unavailable coarse-grained equations are implemented through short bursts of appropriately initialized simulations of the "fine-scale", detailed coupled oscillator model. Coarse projective integration and coarse fixed point computations are illustrated.

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