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Dynamo action driven by precessional turbulence.

Vivaswat Kumar1,2, Federico Pizzi1,3, George Mamatsashvili1,4

  • 1Institute of Fluid Dynamics, <a href="https://ror.org/01zy2cs03">Helmholtz-Zentrum Dresden-Rossendorf</a>, Bautzner Landstraße 400, 01328 Dresden, Germany.

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This study reveals efficient magnetic dynamo action in precessional flows, driven by turbulence. Dynamo strength increases with precession and magnetic Prandtl number, showing scale-dependent driving mechanisms.

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Area of Science:

  • Geophysics
  • Astrophysics
  • Fluid Dynamics

Background:

  • Precession-driven flows generate hydrodynamic turbulence.
  • Understanding magnetic dynamo action in such flows is crucial for astrophysical and geophysical contexts.

Purpose of the Study:

  • To analyze efficient magnetic dynamo action in a precessional flow model.
  • To investigate the kinematic stage of precession-driven dynamo.
  • To determine the influence of precession strength and magnetic Prandtl number on dynamo action.

Main Methods:

  • Utilized a local model of precessional flow.
  • Performed spectral analysis of magnetic energy and induction equation terms in Fourier space.
  • Decomposed velocity field into 2D vortical and 3D inertial wave modes.

Main Results:

  • Magnetic field growth rate increases monotonically with Poincaré number (Po) and magnetic Prandtl number (Pm).
  • Critical Poincaré number (Po_c) for dynamo onset decreases with increasing Pm.
  • Dynamo operates across scales, transitioning from vortex-driven to a complex regime involving vortices, inertial waves, and shear at higher Po.

Conclusions:

  • The study demonstrates an efficient magnetic dynamo mechanism in precession-driven turbulence.
  • Dynamo driving mechanisms are scale-dependent, involving vortices, inertial waves, and shear.
  • Findings have implications for understanding magnetic fields in celestial bodies and other turbulent flows.