Synchronizing the helicity of Rayleigh-Bénard convection by a tide-like electromagnetic forcing
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arXiv
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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
| Publié: |
2022
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| _version_ | 1866911923481608192 |
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| author | Jüstel, Peter Röhrborn, Sebastian Eckert, Sven Galindo, Vladimir Gundrum, Thomas Stepanov, Rodion Stefani, Frank |
| author_facet | Jüstel, Peter Röhrborn, Sebastian Eckert, Sven Galindo, Vladimir Gundrum, Thomas Stepanov, Rodion Stefani, Frank |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2207_09981 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Synchronizing the helicity of Rayleigh-Bénard convection by a tide-like electromagnetic forcing Jüstel, Peter Röhrborn, Sebastian Eckert, Sven Galindo, Vladimir Gundrum, Thomas Stepanov, Rodion Stefani, Frank Fluid Dynamics Space Physics 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. |
| title | Synchronizing the helicity of Rayleigh-Bénard convection by a tide-like electromagnetic forcing |
| topic | Fluid Dynamics Space Physics |
| url | https://arxiv.org/abs/2207.09981 |