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Berlin 2018 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 70: Poster: Flows, Patterns, Delay, Reaction Diffusion

DY 70.4: Poster

Thursday, March 15, 2018, 15:30–18:00, Poster A

Rotating turbulent Rayleigh-Bérnard convection at very large Rayleigh numbers — •Marcel Wedi1,2, Dennis van Gils3, Stephan Weiss2, Guenter Ahlers4, and Eberhard Bodenschatz21Georg-August-Universität Göttingen, Germany — 2Max Planck Institute for Dynamics and Self-Organisation, Germany — 3Twente University, Enschede, The Netherlands — 4University of California, Santa Barbara, USA

Thermal convection in astro- and geophysical systems is both, highly turbulent and strongly influenced by Coriolis forces caused by the rotation of their celestial body. We aim to study the influence of rotation on the heat transport and the temperature field at very large thermal driving, in the High Pressure Convection Facility (HPCF) in Göttingen. The facility consists of a cylindrical cell with a diameter of 1.10 m and a height of 2.20 m that can be filled with pressurized sulfur hexafluoride (SF6) of up to 19 bar. The height of the cell and the large density of SF6 enable us to reach Ra up to 2× 1015. The cell is mounted on a rotating table and connected to the non-rotating world via water feed-throughs and slip rings. We can reach Ekman numbers down to 10−8 while still keeping the influence of centrifugal forces small. In our poster we show and discuss recent major upgrades of the facility as well as measurements of the heat flux and the temperature field.

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