Comparative Analysis of Packet and Trigger Waves Originating from a Finite Wavelength Instability

The finite wavelength instability generates trigger and packet waves in an extended three-variable Brusselator-type model. The trigger waves account for experimentally observed stacking (shock) structures and acceleration of oncoming waves before collision observed in the Belousov−Zhabotinsky system. Packet waves exhibit specular reflection from surfaces. The mouth of a narrow tube connected to a broader region acts as a semitransparent mirror for packet waves leaving the tube, with a coefficient of transparency that depends on the tube radius.