Strong and weak dynamo regimes in Taylor-Couette flows
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| Format: | Preprint |
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2025
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| _version_ | 1866908499682787328 |
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| author | Mishra, A. Mamatsashvili, G. Stefani, F. |
| author_facet | Mishra, A. Mamatsashvili, G. Stefani, F. |
| contents | We reveal a nonlinear magnetic dynamo in a Taylor-Couette flow at small magnetic Prandtl numbers $Pm\leq 1$, which has been previously believed to exist only at higher $Pm\gtrsim 10$ in this flow. The amplitude of initial perturbations, $Pm$ and domain aspect ratio play a key role in the onset and evolution of the dynamo. It exists in two main states -- a weak state dominated by large-scale modes and a strong, turbulent state with higher amplitude dominated by small-scale modes. These findings can be important for dynamo processes in various astrophysical objects with small $Pm$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2501_11761 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Strong and weak dynamo regimes in Taylor-Couette flows Mishra, A. Mamatsashvili, G. Stefani, F. Fluid Dynamics Earth and Planetary Astrophysics Solar and Stellar Astrophysics Plasma Physics We reveal a nonlinear magnetic dynamo in a Taylor-Couette flow at small magnetic Prandtl numbers $Pm\leq 1$, which has been previously believed to exist only at higher $Pm\gtrsim 10$ in this flow. The amplitude of initial perturbations, $Pm$ and domain aspect ratio play a key role in the onset and evolution of the dynamo. It exists in two main states -- a weak state dominated by large-scale modes and a strong, turbulent state with higher amplitude dominated by small-scale modes. These findings can be important for dynamo processes in various astrophysical objects with small $Pm$. |
| title | Strong and weak dynamo regimes in Taylor-Couette flows |
| topic | Fluid Dynamics Earth and Planetary Astrophysics Solar and Stellar Astrophysics Plasma Physics |
| url | https://arxiv.org/abs/2501.11761 |