Regensburg 2019 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 5: Convection

DY 5.6: Vortrag

Montag, 1. April 2019, 11:45–12:00, H3

Rotating turbulent Rayleigh-Bénard convection at very large Rayleigh numbers — •Marcel Wedi¹, Dennis van Gils², Stephan Weiss¹, and Eberhard Bodenschatz¹ — ¹Max-Planck-Institut for Dynamics and Self-Organization, Göttingen, Germany — ²Twente University, The Netherlands

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) or Helium at up to 19 bar. The height of the cell and the large density of SF₆ enables us to reach large thermal drivings with Rayleigh numbers 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 reach Ekman numbers down to 10⁻⁸, possibly entering the geostrophic regime. At very high rotation rates the Froude number increases and centrifugal forces may not be negligable. The effects of rotation and applied temperature settings are looked at in the temperature field. In our talk, we discuss these effects and the behavior of the flow field as well as the heat transport.