The Persistent Clock of Turbulent Thermal Convection
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866914198119776256 |
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| author | Martínez-Ortíz, Lázaro Lemm, Youri H. Clercx, Herman J. H. Kunnen, Rudie P. J. |
| author_facet | Martínez-Ortíz, Lázaro Lemm, Youri H. Clercx, Herman J. H. Kunnen, Rudie P. J. |
| contents | The large-scale circulation (LSC) of turbulent convection is a prominent feature of its dynamics and forms the basis for descriptive theories. We show, using experimental and numerical results from thermal convection in a cylindrical cell, that the LSC possesses a persistent internal `clock': its pulsating velocity as a function of time is described by a constant value of the parameter U/(lf) where U is the mean velocity, f the pulsation frequency, and l the characteristic length scale. By introducing a narrow sidewall barrier, we can trip the LSC, forming a pair of interconnected rolls stacked above and below the barrier. They independently exhibit the same value for the ratio U/(lf), even for vertically asymmetric pairs, indicating signs of synchrony. Thus, this parameter establishes a direct connection between plume-shedding dynamics and the flow topology. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_11669 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The Persistent Clock of Turbulent Thermal Convection Martínez-Ortíz, Lázaro Lemm, Youri H. Clercx, Herman J. H. Kunnen, Rudie P. J. Fluid Dynamics The large-scale circulation (LSC) of turbulent convection is a prominent feature of its dynamics and forms the basis for descriptive theories. We show, using experimental and numerical results from thermal convection in a cylindrical cell, that the LSC possesses a persistent internal `clock': its pulsating velocity as a function of time is described by a constant value of the parameter U/(lf) where U is the mean velocity, f the pulsation frequency, and l the characteristic length scale. By introducing a narrow sidewall barrier, we can trip the LSC, forming a pair of interconnected rolls stacked above and below the barrier. They independently exhibit the same value for the ratio U/(lf), even for vertically asymmetric pairs, indicating signs of synchrony. Thus, this parameter establishes a direct connection between plume-shedding dynamics and the flow topology. |
| title | The Persistent Clock of Turbulent Thermal Convection |
| topic | Fluid Dynamics |
| url | https://arxiv.org/abs/2512.11669 |