On the Saturation of Astrophysical Dynamos: Numerical Experiments with the No-Cosines Flow |
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| Authors: | S B F Dorch V Archontis |
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| Institution: | 1. The Niels Bohr Institute for Astronomy, Physics and Geophysics, Juliane Maries Vej 30, Copenhagen ?, Denmark
2. Instituto de Astrofisica de Canarias, Via Lactea, La Laguna, Spain
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| Abstract: | In the context of astrophysical dynamos we illustrate that the no-cosines flow, with zero mean helicity, can drive fast dynamo
action and we study the dynamo’s mode of operation during both the linear and non-linear saturation regimes. It turns out
that in addition to a high growth rate in the linear regime, the dynamo saturates at a level significantly higher than normal
turbulent dynamos, namely at exact equipartition when the magnetic Prandtl number Prm∼ 1. Visualization of the magnetic and velocity fields at saturation will help us to understand some of the aspects of the
non-linear dynamo problem. |
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