In this work we investigate the effect of density-dependent nonlinear diffusion on pattern formation in theBrusselator system. Through linear stability analysis of the basic solution we determine the Turing and theoscillatory instability boundaries. A comparison with the classical linear diffusion shows how nonlinear diffusionfavors the occurrence of Turing pattern formation. We study the process of pattern formation both in one-dimensional and two-dimensional spatial domains. Through a weakly nonlinear multiple scales analysis wederive the equations for the amplitude of the stationary patterns. The analysis of the amplitude equations showsthe occurrence of a number of different phenomena, including stable supercritical and subcritical Turing patternswith multiple branches of stable solutions leading to hysteresis. Moreover, we consider traveling patterning waves:When the domain size is large, the pattern forms sequentially and traveling wave fronts are the precursors topatterning. We derive the Ginzburg-Landau equation and describe the traveling front enveloping a pattern whichinvades the domain. We show the emergence of radially symmetric target patterns, and, through a matchingprocedure, we construct the outer amplitude equation and the inner core solution.
|Numero di pagine||12|
|Rivista||PHYSICAL REVIEW E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS|
|Stato di pubblicazione||Published - 2013|
All Science Journal Classification (ASJC) codes