用晶格Boltzmann方法研究激发介质中时空混沌的产生与控制

Studying on the Occurrence and Control of the Spatiotemporal Chaos in Excited Media with Lattice Boltzmann Method

采用晶格Boltzmann方法,通过计算机数值模拟,研究激发介质中时空混沌的产生与控制。结果发现激发介质螺旋波的失稳属于多普勒失稳;螺旋波破碎成时空混沌前出现波头螺旋式运动;处于时空混沌态的系统各个位置具有相同的振幅谱;适当频率的正弦振荡信号可有效地控制时空混沌态。

The occurrence and control of spatiotemporal chaos in excited media are studied with Lattice Boltzmann method. The numerical results show that the instability of the spiral waves in the excited media is a Doppler instability. The tip of the spiral waves undergoes spiral motion before spiral waves become spatiotemporal chaos. The system has the same amplitude spectrum in different sites after becoming spatiotemporal chaos. The spatiotemporal chaos can be controlled efficiently by the suitable period signal.