无扩散功能的缺陷对螺旋波动力学行为的影响

采用Br 模型,在二维激发介质中引入无扩散功能的缺陷,研究了均匀分布的缺陷对螺旋波动力学行为的影响.研究发现，缺陷导致介质的激发性降低、波传播速度减少,在一定数量的缺陷均匀分布下,缺陷可以使原来稳定的螺旋波发生漫游或破碎,缺陷使原来不稳定的螺旋波稳定或漫游,首次在激发介质中观察到螺旋波因Doppler效应破碎形成小螺旋波和时空混沌共存现象.对产生这些现象的物理机理做了简要的讨论. 关键词： 激发介质 螺旋波 缺陷

The influence of the defects without diffusion function on dynamics of spiral wave

The B(a)r model is considered.The influence of the defect,defined by failure of the diffusion effect,on dynamics of spiral wave is investigated by introducing in to the system some defects.These defects are uniformly distributed.It was found numerically that these defects can lead to the reduction of the excitability of medium and the wave speed.When the number of defects is large enough,these defects can induce the meandering or the breakage of an originally stable spiral wave.On the other hands,the defects can yet cause an unstable spiral wave to become a rigidly rotating or meandering spiral wave.The phenomenon that Doppler effect causes unstable spiral wave to break up into co-existing states of spatiotemporal chaos and small spiral waves is observed for the first time.The physical mechanism of these phenomena are briefly discussed.