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Magnetically Induced Rotating Rayleigh-Taylor Instability
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Published on: March 3, 2017

Two-dimensional state in driven magnetohydrodynamic turbulence.

Barbara Bigot1, Sébastien Galtier

  • 1Space Science Center, University of New Hampshire, Durham, New Hampshire 03824, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|March 17, 2011
PubMed
Summary
This summary is machine-generated.

Investigating two-dimensional (2D) states in 3D magnetohydrodynamic turbulence reveals that a strong external magnetic field significantly enhances the 2D state, influencing energy spectra and leading to Alfvénic fluctuations.

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Area of Science:

  • Physics
  • Fluid Dynamics
  • Plasma Physics

Background:

  • Magnetohydrodynamics (MHD) describes plasma behavior.
  • Turbulence in 3D MHD is complex, with 2D states influencing dynamics.
  • External magnetic fields can alter turbulent properties.

Purpose of the Study:

  • To investigate the dynamics of the 2D state in driven 3D incompressible MHD turbulence.
  • To analyze the impact of external magnetic field strength on 2D and 3D modes.
  • To understand energy transfer and spectral characteristics under different driving conditions.

Main Methods:

  • High-resolution direct numerical simulations (DNS).
  • Simulations conducted in the presence of external magnetic fields of varying intensities.
  • Analysis of spectral fluctuations for 2D (k(∥)=0) and 3D (k(∥)>0) modes.

Main Results:

  • The 2D state, initially zero, becomes significant over time, especially with strong external magnetic fields.
  • Large-scale driving causes a break in 3D mode energy spectra.
  • Stopping the driving leads to a decay phase with Alfvénic fluctuations.
  • For strong fields, energy at large perpendicular scales concentrates in the 2D state.
  • A pinning effect is consistently observed at small scales.

Conclusions:

  • The 2D state plays a crucial role in 3D MHD turbulence, particularly under strong external magnetic fields.
  • Driving and its cessation significantly alter the energy cascade and spectral properties.
  • External magnetic fields and scale-dependent effects like pinning are key features of this system.