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激发介质中螺旋波失稳的微观机理研究
Microcosmic mechanism of spiral wave's instability in excitable medium
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摘要: 采用品格Boltzmann方法研究了激发介质中螺旋波的失稳,计算机数值模拟给出了激发介质中螺旋波失稳前后的速度场分布,并结合斑图和波头轨迹进行讨论发现,稳定螺旋波的速度场分布表现为螺旋波旋转中心处的速度做周期突变;在螺旋波开始失稳时,速度场分布表现为该位置粒子速度突变加快最后变得无规律,使速度集团分解无规律,导致速度场分布越来越混乱,并最终使系统进入时空混沌态.
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关键词:
- 晶格Boltzmann方法 /
- 激发介质 /
- 螺旋波 /
- 时空混沌
Abstract: The instability of the spiral wave in an excitable medium is investigated by using the lattice Boltzmann method.The velocity distribution of the system are obtained by computer simulation,and discussed in connection with the pattern and the tip trajectory of the spiral wave.We find that the velocity of the particle at the rotating center of spiral wave changes periodically,while the change of this particle's velocity is quickened and then becomes random when the spiral wave becomes unstable,which leads to the random decomposition of the velocity group and random distribution of velocity.The system falls into the spatiotemporal chaos finally. -
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