Berlin 2008 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 13: Cardiac dynamics and reaction-diffusion systems
DY 13.6: Vortrag
Dienstag, 26. Februar 2008, 12:45–13:00, MA 004
Percolation effects in front propagation — •Sergio Alonso1, Karin John2, Raymond Kapral3, and Markus Baer1 — 1Physikalisch-Technische Bundesanstalt, Berlin, Germany — 2Université J. Fourier, Grenoble, France — 3University of Toronto, Toronto, Canada
Waves and fronts propagate in nonlinear spatially extended systems. Normally extended systems present heterogeneities and deformations which hinder the stable propagation and which cannot be avoided. Numerical models do not usually consider any type of defects and they study homogeneous models. Here we study the propagation of a front in a bistable media for two different types of defects: some sites of the numerical grid do not propagate the front (site percolation), or some connections between the sites do not propagate (bond percolation). We calculate the velocity of both situations for different density of defects, and compare the results with an effective medium theory.