Abstract: According to the two-dimensional Tyson model based on FKN mechanism, we study the forming process of target wave and spiral wave by using the differential method. It is found from our simulation that there is a defect in the center of spiral waves, which dominates the dynamics of spiral waves. In experiments, a spiral pair is initiated by cutting out a target wave. The single spiral wave and broken spiral wave are also observed. The experimental results are in agreement with the simulations. The Belousov-Zhabotinsky reaction should be a part of nonlinear experiment course in order to enrich the experiments of spatio-temporal dynamics.

Key words: Belousov-Zhabotinsky reaction, point defect, target wave, spiral wave, numerical simulation