Regensburg 2016 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 60: Pattern Formation (Joint Session with DY)
BP 60.7: Vortrag
Donnerstag, 10. März 2016, 11:30–11:45, H46
Subcritical chaos and localized convection in the asymptotic suction boundary layer over a heated plate — •Stefan Zammert1 and Bruno Eckhardt1,2 — 1Fachbereich Physik, Philipps-Universität Marburg, D-35032 Marburg, Germany — 2J.M. Burgerscentrum, Delft University of Technology, 2628 CD Delft, The Netherlands
The asymptotic suction boundary layer over a heated plate, a parallel and open flow, can be considered as a model for the properties of thermal boundary layers. A stability analysis of the base state shows that the flow undergoes a subcritical instability with increasing Rayleigh number. This instability creates spatially periodic convection patterns. We will show how bifurcations of these secondary solutions create a chaotic attractor in the subcritical regime which is turned into a chaotic saddle by a crisis bifurcation. Long-wavelength instabilities of the secondary solutions create various stationary convection solutions which are localized in one or two directions parallel to the plate. These localized structures also exist in subcritical regime and can potentially be used to study plume dynamics in thermal boundary layers.