A numerical model of the VKS experiment
arXiv:0906.3792 · doi:10.1209/0295-5075/87/39002
Abstract
We present numerical simulations of the magnetic field generated by the flow of liquid sodium driven by two counter-rotating impellers (VKS experiment). Using a dynamo kinematic code in cylindrical geometry, it is shown that different magnetic modes can be generated depending on the flow configuration. While the time averaged axisymmetric mean flow generates an equatorial dipole, our simulations show that an axial field of either dipolar or quadrupolar symmetry can be generated by taking into account non-axisymmetric components of the flow. Moreover, we show that by breaking a symmetry of the flow, the magnetic field becomes oscillatory. This leads to reversals of the axial dipole polarity, involving a competition with the quadrupolar component.
6 pages, 5 figures
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- Self-consistent simulations of a von Kármán type dynamo in a spherical domain with metallic walls
- Decay rates of magnetic modes below the threshold of a turbulent dynamo
- Parametric study and optimization trends for the Von-Kármán-Sodium dynamo experiment