Rayleigh-Bénard Convection



Experimental results for a thin layer of fluid heated from below. Visualization by shadowgraph. Shown is top view onto the experimental dish.

For weak heating (close to onset): rolls and hexagons


(inclined layer, traveling rolls)







More complicated structures: spirals






Disordered patterns: spiral-defect chaos

Movie of spiral-defect chaos

Straight rolls and spiral defect chaos exist for the same parameter values


(Melnikov et al. AIP Proc. 501 (2000) 36)

Numerical simulation of coexistence of straight rolls and spiral defect chaos



(pictures and movies taken from ©Nonlinear Phenomena Group,LASSP,Cornell University 9/99, and Max Planck Institute for Dynamics and Self-Organization)