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DY: Fachverband Dynamik und Statistische Physik
DY 16: Convection
DY 16.5: Vortrag
Montag, 16. März 2020, 16:30–16:45, ZEU 147
Helical Rayleigh-Benard Convection — •Philipp Reiter1, Rodion Stepanov2, and Olga Shishkina1 — 1Max-Planck Institute for Dynamics and Self-Organization, Göttingen, Germany — 2Institute of Continuos Media Mechanics, Perm, Russia
Helicity is known to play a key role in generation of large coherent flow structures in a large class of geophysical and astrophysical flows. Here we suggest a new way to inject helicity in convective systems through coupling of the temperature and vertical vorticity via the temperature boundary conditions under the requirement that the area-averaged temperatures of the heated and cooled plates are kept constant.
Using 3D direct numerical simulations, we verify the impact of these boundary conditions on the mean-flow helicity, analyze the global flow structures and the heat transport and investigate their dependencies on the particular parameters of the boundary conditions. For a certain set of parameters, when a significant amount of helicity is injected, we observe generation of the mean vertical angular momentum. In that case, after an initial transitional phase, the flow enters a state of a well-pronounced stable rotation.