Regensburg 2013 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

DY: Fachverband Dynamik und Statistische Physik

DY 7: Poster I

DY 7.23: Poster

Monday, March 11, 2013, 17:30–19:30, Poster C

Curvature dependent Feedback Control of two dimensional Excitation Waves — •Sonja Molnos, Jakob Löber, and Harald Engel — Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany

The propagating liquid-solid interface in an undercooled fluid can undergo a Mullins-Sekerka-instability, which for example leads to the formation of snowflakes [1]. We investigate a mechanism to create such instabilities in a reaction diffusion system. With the developed curvature-dependent feedback control it is possible to counteract the role of the eikonal equation and thereby destabilize the plane wave front. The appearance of the instability can be suppressed, choosing the the width of the active medium below a certain threshold. This can be explained using the Kuramoto-Sivashinsky equation.

[1] J. S. Langer, Rev. Mod. Phys. 52, 1 (1980)