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Urheberrechtshinweis / Copyright notice
Bitte beziehen Sie sich beim Zitieren dieses Dokumentes immer auf folgende URN: urn:nbn:de:kobv:517-opus-14986 URL: http://opus.kobv.de/ubp/volltexte/2007/1498/ Demircan, Ayhan ; Seehafer, Norbert
Nonlinear square patterns in Rayleigh-Bénard convection
Kurzfassung auf EnglischWe 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.
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