The geometry of an active medium can cause wave blocking and induce unidirectional propagation. This well established phenomenon was studied in a previous paper within the framework of the photosensitive Belousov-Zhabotinsky reaction and the associated Oregonator model. In the present paper, as an extension of that study, the main factors that influence this phenomenon are interpreted in terms of a kinematic model.

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The length of the wave calculated from Eq. (1) is obtained first locating the maximum of the u field along the direction of propagation and then adding up those points above a threshold chosen to be 0.3 (a perturbation below this value is unable to spread by diffusion).

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