Implications of a non-uniform permeability distribution on the generation of magnetic fields in the Von-K\'arm\'an-Sodium dynamo experiment.


Implications of a non-uniform permeability distribution on the generation of magnetic fields in the Von-K\'arm\'an-Sodium dynamo experiment.

Giesecke, A.

Numerical simulations of the kinematic induction equation have been carried out in a setup that resembles the configuration of the VKS dynamo experiment. Primary objective are investigations of the impact of the non-uniform permeability distribution introduced by the ferrous impellers that drive a flow of liquid sodium in the experiment. It is shown that a high-permeability domain favours the axisymetric field mode whereas the first non-axisymmetric mode remains nearly unaffected. However, to circumvent the restrictions of Cowling's theorem, still an alpha-effect is required to explain the axisymmetric field as it is observed in the experiment.

Keywords: VKS; Dynamo; Induction; MHD

  • Invited lecture (Conferences)
    Seminar am Laboratoire d'Informatique pour la Mécanique et les Sciences de l'Ingénieur (LIMSI), 05.05.2009, Paris, Frankreich

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Publ.-Id: 12682