Large-scale Dynamo Action Driven by Velocity Shear and Rotating Convection

Abstract

By incorporating a large-scale shear flow into turbulent rotating convection, we show that a sufficiently strong shear can promote dynamo action in flows that in the absence of shear do not act as dynamos. Our results are consistent with a dynamo driven by either the shear-current effect or by the interaction between a fluctuating $\alpha$-effect and the velocity shear; they are though inconsistent with either a classical ${\alpha }^2$ or $\alpha \omega$ mean field dynamo.

4 pages, 4 figs

References in corpus (6)

• Large-scale dynamos in turbulent convection with shear
• Generation of Magnetic Field by Combined Action of Turbulence and Shear
• Effects of fluctuation on alpha-omega dynamo models
• Numerical experiments on dynamo action in sheared and rotating turbulence
• Shear-current effect in a turbulent convection with a large-scale shear
• New mechanism of generation of large-scale magnetic field in a sheared turbulent plasma

Cited by in corpus (3)

• Alpha effect and diffusivity in helical turbulence with shear
• Advances in theory and simulations of large-scale dynamos
• The alpha effect with imposed and dynamo-generated magnetic fields