Non-Oberbeck-Boussinesq effects and prediction of the bulk temperature in turbulent Rayleigh-Benard convection

ORAL

Abstract

We report results of a complementary experimental and numerical study of turbulent non-Oberbeck-Boussinesq Rayleigh-Benard convection (NOB RBC) in pressurized sulfur hexafluoride (SF6). The measurements are conducted in a cylindrical cell of a height 2.2m and diameter 1.1m in the Uboot of the Max Planck Turbulence Facility in Göttingen and direct numerical simulations (DNS) are performed with the Goldfish code, for a wide range of Rayleigh numbers and different NOB conditions. The numerical and experimental results are compared with predictions for the bulk and the reference temperatures of the top and bottom boundary layers made in Weiss, He, Ahlers, Bodenschatz, Shishkina, J. Fluid Mech., 2018.

*The work is supported by the Max Planck Society and the Deutsche Forschungsgemeinschaft (DFG) under the grant Sh 405/4 - Heisenberg fellowship.

–

Presenters

  • Eberhard Bodenschatz

    • Max Planck Inst. Goettingen
    • Max Planck Institute for Dynamics and Self-Organization
    • Max Planck Inst
    • Max Planck Institute of Dynamics and Self-Organization, Göttingen, Germany

Authors

  • Eberhard Bodenschatz

    • Max Planck Inst. Goettingen
    • Max Planck Institute for Dynamics and Self-Organization
    • Max Planck Inst
    • Max Planck Institute of Dynamics and Self-Organization, Göttingen, Germany

  • Stephan Weiss

    • Max Planck Inst. Goettingen
    • Max Planck Inst
    • Max Planck Institute
    • Max Planck Institute for Dynamics and Self-Organization

  • Marcel Wedi

    • Max Planck Inst. Goettingen

  • Xuan Zhang

    • Max Planck Inst. Goettingen
    • Max Planck Institute for Dynamics and Self-Organization
    • Max Planck Institute for Dynamics and Self-organization, University of Michigan - Dearborn

  • Olga Shishkina

    • Max Planck Inst. Goettingen