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Large-scale dynamos in rigidly rotating turbulent convection
P. J. Käpylä, M. J. Korpi, A. Brandenburg
The existence of large-scale dynamos in rigidly rotating turbulent convection without shear is studied using three-dimensional numerical simulations of penetrative rotating compres…
Turbulent dynamos in spherical shell segments of varying geometrical extent
Dhrubaditya Mitra, Reza Tavakol, Axel Brandenburg +1
We use three-dimensional direct numerical simulations of the helically forced magnetohydrodynamic equations in spherical shell segments in order to study the effects of changes in…
Alpha effect and turbulent diffusion from convection
P. J. Käpylä, M. J. Korpi, A. Brandenburg
(abridged) Aims: To study turbulent transport coefficients that describe the evolution of large-scale magnetic fields in turbulent convection. Methods: We use the test field method…
Memory effects in turbulent transport
Alexander Hubbard, Axel Brandenburg
In the mean-field theory of magnetic fields, turbulent transport, i.e. the turbulent electromotive force, is described by a combination of the alpha effect and turbulent magnetic d…
Turbulent dynamos with shear and fractional helicity
P. J. Käpylä, A. Brandenburg
Dynamo action owing to helically forced turbulence and large-scale shear is studied using direct numerical simulations. The resulting magnetic field displays propagating wave-like…
Numerical study of large-scale vorticity generation in shear-flow turbulence
Petri J. Käpylä, Dhrubaditya Mitra, Axel Brandenburg
Simulations of stochastically forced shear-flow turbulence in a shearing-periodic domain are used to study the spontaneous generation of large-scale flow patterns in the direction…