Berlin 2008 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 17: Poster I

DY 17.43: Poster

Dienstag, 26. Februar 2008, 16:00–18:00, Poster C

Three-dimensional wave propagation in thin layers of a photo-sensitive BZ-medium — •Peter A. Kolski, Hermann Brandtstädter, and Harald Engel — Institut für Theoretische Physik, TU Berlin, Hardenbergstr. 36, D-10623 BERLIN

We study the dynamics of excitation waves in thin gel layers of the light-sensitive Belousov-Zhabotinsky (BZ) medium in the presence of an excitability gradient transverse to the direction of propagation. Due to Beer-Lamberts law the effective light intensity decreases exponentially with the depth into the layer. Three-dimensional numerical simulations of the underlying reaction-diffusion equations were performed to reveal experimentally observed complex pattern. Calculations were carried out using the Oregonator model modified to describe the photosensitive BZ reaction. The results provide insight into the mechanism of reflective wave collision close to the transition between excitable and oscillatory local kinetics. Inhibiting only parts of the layer leads to the formation of scroll waves and allows for the study of their dynamics in this constraint geometry.