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Updated: Jan 16, 2026

Magnetically Induced Rotating Rayleigh-Taylor Instability
Published on: March 3, 2017
Strong and Weak Dynamo Regimes in Taylor-Couette Flows
Ashish Mishra1, George Mamatsashvili1,2, Frank Stefani1
1Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstr. 400, D-01328 Dresden, Germany.
Abstract:
We reveal a nonlinear magnetic dynamo in a Taylor-Couette flow at small magnetic Prandtl numbers Pm≤1, which has been previously believed to exist only at higher Pm≳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.
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