Regensburg 2019 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 5: Convection

DY 5.7: Talk

Monday, April 1, 2019, 12:00–12:15, H3

Non-Oberbeck-Boussinesq effects and flow structures in Rotating Rayleigh–Bénard convection in pressurized SF₆ — •Xuan Zhang and Olga Shishkina — Max Planck Institute for Dynamics and Self-Organization, Am Faßberg 17, 37077 Göttingen

Rotating Rayleigh–Bénard convection (RBC) in pressurized sulfur hexafluoride (SF₆) in a cylindrical cell of the diameter-to-height aspect ratio 1/2 is studied using our finite-volume code Goldfish. The results based on direct numerical simulations (DNS) at Prandtl number 0.8, Rayleigh number 10⁸ to 10¹⁰ and Rossby number 0.02 to 50 are presented. Non-Oberbeck-Boussinesq effects are studied by considering temperature dependence of the fluid properties, and the results are compared to those under Oberbeck-Boussinesq approximation. Effects of rotation on the flow structures are investigated in terms of the global heat transfer, dynamics of large-scale circulation, long-term bulk temperature statistics and local historical temperature signals.

Funding Acknowledgment: The work is supported by the German Research Foundation under the grant SH405/8 and Heisenberg fellowship SH405/4. We acknowledge the Leibniz Supercomputing Centre (LRZ) for providing computing resources on SuperMUC.