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1 PublicationSynchronizing the helicity of Rayleigh-Bénard convection by a tide-like electromagnetic forcing
Jüstel, P.; Röhrborn, S.; Eckert, S.; Galindo, V.; Gundrum, T.; Stepanov, R.; Stefani, F.
We present results on the synchronization of the helicity in a liquid-metal Rayleigh-Bénard (RB) experiment under the influence of a tide-like electromagnetic forcing with azimuthal wavenumber m = 2. We show that for a critical forcing strength the typical Large Scale Circulation (LSC) in the cylindrical vessel of aspect ratio unity is entrained by the period of the tide-like forcing, leading to synchronized helicity oscillations with opposite signs in two half-spaces. The obtained experimental results are consistent with and supported by numerical simulations. A similar entrainment mechanism for the helicity in the solar tachocline may be responsible for the astonishing synchronization of the solar dynamo by the 11.07-year triple synodic alignment cycle of the tidally dominant planets Venus, Earth and Jupiter.
Keywords: Electromagnetic forcing; Magnetohydrodynamics; Helicity synchronization
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Physics of Fluids 34(2022)10, 104115
DOI: 10.1063/5.0114035
Cited 1 times in Scopus
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Permalink: https://www.hzdr.de/publications/Publ-34958