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Analyzing a modulated electromagnetic m=2 forcing and its capability to synchronize the Large Scale Circulation in a Rayleigh-Bénard cell of aspect ratio Г = 1

Röhrborn, S.; Jüstel, P.; Galindo, V.; Gundrum, T.; Schindler, F.; Stefani, F.; Stepanov, R.; Vogt, T.


The synchronization of the helicity of an instability with azimuthal wavenumber m = 1 by a weak tidal m = 2 perturbation might play a key role in explaining the phase-stable Schwabe cycle of the solar dynamo [1]. In order to elucidate this type of interaction, we study a thermally driven Rayleigh-Bénard Convection (RBC) under a tide-like influence. We focus first on the generation of the m = 2 mode flow by an electromagnetic forcing, and second on its low-frequency modulation. In the last part, we present preliminary results on the interaction of this perturbation with the sloshing/torsional motion of the Large Scale Circulation (LSC) of an RBC flow. While the main focus of the paper is on the numerical side, some comparisons with experimental results are also made.

Keywords: Magnetohydrodynamics; Rayleigh-Bénard convection; liquid metal flow; electromagnetic forcing; CFD

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