Turbulent Rayleigh–Bénard convection in a strong vertical magnetic field. (25th July 2020)

• Record Type: Journal Article
• Authors: Akhmedagaev, R.; Zikanov, O.; Krasnov, D.; Schumacher, J.
• Is Part Of: Journal of fluid mechanics. Volume 895(2020)
• Publication Date: 2020-07-25
• Subjects: Bénard convection, -- magneto convection, -- high-Hartmann-number flows; Fluid mechanics -- Periodicals; 532.005
• DOI: 10.1017/jfm.2020.336
• Languages: English
• ISSNs: 0022-1120

Abstract

Abstract : Abstract : Direct numerical simulations are carried out to study the flow structure and transport properties in turbulent Rayleigh–Bénard convection in a vertical cylindrical cell of aspect ratio one with an imposed axial magnetic field. Flows at the Prandtl number $0.025$ and Rayleigh and Hartmann numbers up to $10^{9}$ and $1400$, respectively, are considered. The results are consistent with those of earlier experimental and numerical data. As anticipated, the heat transfer rate and kinetic energy are suppressed by a strong magnetic field. At the same time, their growth with Rayleigh number is found to be faster in flows at high Hartmann numbers. This behaviour is attributed to the newly discovered flow regime characterized by prominent quasi-two-dimensional structures reminiscent of vortex sheets observed earlier in simulations of magnetohydrodynamic turbulence. Rotating wall modes similar to those in Rayleigh–Bénard convection with rotation are found in flows near the Chandrasekhar linear stability limit. A detailed analysis of the spatial structure of the flows and its effect on global transport properties is reported.