TY  - JOUR
A1  - Demircan, Ayhan
A1  - Seehafer, Norbert
T1  - Nonlinear square patterns in Rayleigh-Benard convection
N2  - We numerically investigate nonlinear asymmetric square patterns in a horizontal convection layer with up-down reflection symmetry. As a novel feature we find the patterns to appear via the skewed varicose instability of rolls. The time-independent nonlinear state is generated by two unstable checkerboard (symmetric square) patterns and their nonlinear interaction. As the bouyancy forces increase the interacting modes give rise to bifurcations leading to a periodic alternation between a nonequilateral hexagonal pattern and the square pattern or to different kinds of standing oscillations.
Y1  - 2001
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/17781
UR  - http://www.edpsciences.com/articles/euro/full/2001/02/6376/6376.html
ER  -