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Two spinning ways for precession dynamo.

L Cappanera1, J-L Guermond2, J Léorat3

  • 1Laboratoire d'Informatique pour la Mécanique et les Sciences de l'Ingénieur, LIMSI, CNRS, Univ. Paris-Sud, Université Paris-Saclay, Bât 508, Campus Universitaire F-91405 Orsay, France.

Physical Review. E
|May 14, 2016
PubMed
Summary
This summary is machine-generated.

Precession triggers dynamo action in a cylindrical container. Equatorial spinning is more effective than axial spinning at breaking flow symmetry and sustaining magnetic fields.

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Area of Science:

  • Magnetohydrodynamics
  • Dynamo Theory
  • Fluid Dynamics

Background:

  • Dynamo action, the generation of magnetic fields by fluid motion, is crucial for astrophysical phenomena.
  • Precession, the slow wobble of a rotating body, is a potential driver of fluid motion in celestial bodies.
  • Understanding how precession influences dynamo action is key to comprehending planetary and stellar magnetism.

Purpose of the Study:

  • To numerically investigate the influence of precession on dynamo action in a cylindrical fluid.
  • To compare the effectiveness of axial and equatorial spinning configurations in triggering and sustaining dynamo action.
  • To identify scaling laws and characterize the resulting magnetic field structures.

Main Methods:

  • Utilized a magnetohydrodynamic (MHD) code for numerical simulations.
  • Explored two distinct configurations: axial spin and equatorial spin.
  • Varied the kinetic Reynolds number to observe changes in flow symmetry and dynamo behavior.

Main Results:

  • Precession was demonstrated to trigger dynamo action in both axial and equatorial spin cases.
  • Flow centro-symmetry breaking was observed with increasing kinetic Reynolds number, more efficiently in the equatorial case.
  • A scaling law for average kinetic energy was derived for the axial spin case.
  • The equatorial spin case sustained dynamo action in both linear and nonlinear regimes, producing predominantly dipolar magnetic fields.
  • The axial spin case generated predominantly quadrupolar magnetic fields.

Conclusions:

  • Precession is a viable mechanism for initiating dynamo action in confined fluid systems.
  • Equatorial spinning is a more efficient configuration for breaking flow symmetry and generating magnetic fields.
  • The resulting magnetic field topology (dipolar vs. quadrupolar) depends on the spin configuration.