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Numerical simulations of kinematic dynamo action. (English) Zbl 1069.76057

Summary: Numerical simulations of kinematic dynamo action in steady and three-dimensional \(ABC\) flows are presented with special focus on the difference in growth rates between single and multiple periods of the prescribed velocity field. It is found that the difference in growth rate (apart from a trivial factor stemming from a scaling of the rate of strain with the wavenumber of the velocity field) is due to differences in the recycling of the weakest part of magnetic field. The single wavelength classical \(ABC\)-flow experiments impose stronger symmetry requirements, which results in a suppression of the growth rate. The experiments with larger wave number achieve growth rates that are more compatible with the turn-over time scale by breaking the symmetry of the resulting dynamo-generated magnetic field. Differences in topology in cases with and without stagnation points in the imposed velocity field are also investigated, and it is found that the cigar-like structures that develop in the classical \(A= B= C\) dynamos are replaced by ribbon structures in cases where the flow is without stagnation points.

MSC:

76W05 Magnetohydrodynamics and electrohydrodynamics