arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.11730nlin.PS
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耦合反应扩散系统中的时空混沌与拟斑图

Spatiotemporal chaos and quasipatterns in coupled reaction-diffusion systems

Jennifer K. Castelino, Daniel J. Ratliff, Alastair M. Rucklidge, Priya Subramanian, Chad M. Topaz

摘要:

在耦合的反应扩散系统中,具有两个不同长度尺度的模式可以相互作用以产生各种各样的时空模式。这些模式之间的三波相互作用可以解释空间复杂的稳定模式和时变状态,包括时空混沌的发生。相互作用可以采取两个具有不同取向的短波与一个长波相互作用的形式,反之亦然。我们调查的作用,这样的三波相互作用中的耦合耦合meselator系统。当波相互加强时,我们不仅可以找到简单的稳定模式,还可以找到空间上复杂但稳定的模式,包括准模式。当波相互竞争时,时空混沌等时变状态也是可能的。三波相互作用方程中二次系数的符号区别于这两种情况。通过操纵化学模型的参数,可以鼓励这些不同状态的形成,正如我们通过广泛的数值模拟所证实的那样。我们的论点使我们能够预测时空混沌可能会被发现:标准的非线性方法在这种情况下失败。这些论点相当普遍,适用于广泛的模式形成系统,包括法拉第波实验。

英文摘要:

In coupled reaction-diffusion systems, modes with two different length scales can interact to produce a wide variety of spatiotemporal patterns. Three-wave interactions between these modes can explain the occurrence of spatially complex steady patterns and time-varying states including spatiotemporal chaos. The interactions can take the form of two short waves with different orientations interacting with one long wave, or vice-versa. We investigate the role of such three-wave interactions in a coupled Brusselator system. As well as finding simple steady patterns when the waves reinforce each other, we can also find spatially complex but steady patterns, including quasipatterns. When the waves compete with each other, time varying states such as spatiotemporal chaos are also possible. The signs of the quadratic coefficients in three-wave interaction equations distinguish between these two cases. By manipulating parameters of the chemical model, the formation of these various states can be encouraged, as we confirm through extensive numerical simulation. Our arguments allow us to predict when spatiotemporal chaos might be found: standard nonlinear methods fail in this case. The arguments are quite general and apply to a wide class of pattern-forming systems, including the Faraday wave experiment.

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