Scaling and anisotropy of magnetohydrodynamic turbulence in a strong mean magnetic field - Archive ouverte HAL
Communication Dans Un Congrès AGU Fall Meeting Abstracts Année : 2010

Scaling and anisotropy of magnetohydrodynamic turbulence in a strong mean magnetic field

Résumé

We present a new analysis of the anisotropic spectral energy distribution in incompressible magnetohydrodynamic (MHD) turbulence permeated by a strong mean magnetic field. The turbulent flow is generated by high-resolution pseudo-spectral direct numerical simulations with large-scale isotropic forcing. Examining the radial energy distribution for various angles theta with respect to B reveals a specific structure which remains hidden when not taking axial symmetry with respect to B0 into account. For each direction, starting at the forced large-scales, the spectrum first exhibits an amplitude drop around a wavenumber k0 which marks the start of a scaling range and goes on up to a dissipative wavenumber kd(theta). The 3D spectrum for k >= k0 is described by a single theta-independent functional form F(k/kd), the scaling law being the same in every direction. The previous properties still hold when increasing the mean field from B0=5 up to B0=10 (in units of brms), as well as when passing from resistive to ideal flows. We conjecture that at fixed B0 the direction-independent scaling regime is reached when increasing the Reynolds number above a threshold which raises with increasing B0.
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Dates et versions

hal-01553776 , version 1 (03-07-2017)

Identifiants

  • HAL Id : hal-01553776 , version 1

Citer

W. Mueller, Roland Grappin. Scaling and anisotropy of magnetohydrodynamic turbulence in a strong mean magnetic field. AGU Fall Meeting Abstracts, 2015, San Francisco, United States. pp.03. ⟨hal-01553776⟩
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