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Updated: Mar 8, 2026

Magnetically Induced Rotating Rayleigh-Taylor Instability
Published on: March 3, 2017
Understanding Large-Scale Dynamos in Unstratified Rotating Shear Flows
Tushar Mondal1, Pallavi Bhat1, Fatima Ebrahimi2,3
1International Centre for Theoretical Sciences, Tata Institute of Fundamental Research, Bengaluru 560089, India.
None:
We combine simulations with new analyses that overcome previous pitfalls to explicate how nonhelical mean-field dynamos grow and saturate in unstratified, magnetorotationally driven turbulence. Shear of the mean radial magnetic field amplifies the azimuthal component. Radial fields are regenerated by velocity fluctuations that induce shear of radial magnetic fluctuations, followed by Lorentz and Coriolis forces that source a negative off-diagonal component in the turbulent diffusivity tensor. We present a simple schematic to illustrate this dynamo growth. A different part of the Lorentz force forms a third-order correlator in the mean electromotive force that saturates the dynamo.
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