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6 papers · 2 filters
Enhancement of small-scale turbulent dynamo by large-scale shear
Nishant K. Singh, Igor Rogachevskii, Axel Brandenburg
Small-scale dynamos are ubiquitous in a broad range of turbulent flows with large-scale shear, ranging from solar and galactic magnetism to accretion disks, cosmology and structure…
Sharp magnetic structures from dynamos with density stratification
Sarah Jabbari, Axel Brandenburg, Nathan Kleeorin +1
Recent direct numerical simulations (DNS) of large-scale turbulent dynamos in strongly stratified layers have resulted in surprisingly sharp bipolar structures at the surface. Here…
Convection-driven spherical shell dynamos at varying Prandtl numbers
P. J. Käpylä, M. J. Käpylä, N. Olspert +2
(abidged) Context: Stellar convection zones are characterized by vigorous high-Reynolds number turbulence at low Prandtl numbers. Aims: We study the dynamo and differential rotatio…
Robustness of oscillatory dynamos in spherical wedges
E. Cole, A. Brandenburg, P. J. Käpylä +1
We study the connection between spherical wedge and full spherical shell geometries using simple mean-field dynamos. We solve the equations for a one-dimensional time-depende…
Turbulent reconnection of magnetic bipoles in stratified turbulence
Sarah Jabbari, Axel Brandenburg, Dhrubaditya Mitra +2
We consider strongly stratified forced turbulence in a plane-parallel layer with helicity and corresponding large-scale dynamo action in the lower part and non-helical turbulence i…
Turbulent transport coefficients in spherical wedge dynamo simulations of solar-like stars
Jörn Warnecke, Matthias Rheinhardt, S. Tuomisto +3
We investigate dynamo action in global compressible solar-like convective dynamos in the framework of mean-field theory. We simulate a solar-type star in a wedge-shaped spherical s…