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Development of Anisotropy in Incompressible Magnetohydrodynamic Turbulence by Bigot, Barbara; Galtier, Sebastien; Politano, Helene is a scholarly article available to read on EtoBox.

What is Development of Anisotropy in Incompressible Magnetohydrodynamic Turbulence about?

We present a set of three-dimensional (3D) direct numerical simulations of incompressible decaying magnetohydrodynamic turbulence in which we investigate the influence of an external uniform magnetic field B_0. A parametric study in terms of B_0 intensity is made where, in particular, we distinguish the shear- from the pseudo-Alfven waves dynamics. The initial kinetic and magnetic energies are equal with a negligible cross-correlation. Both the temporal and spectral effects of B_0 are discussed. A sub-critical balance is found between the Alfven and nonlinear times with both a global and a spectral definition. The nonlinear dynamics of strongly magnetized flows is characterized by a different k_perp-spectrum (where B_0 defines the parallel direction) if it is plotted at a fixed k_// (2D spectrum) or if it is integrated (averaged) over all k_// (1D spectrum). In the former case a much wider inertial range is found with a steep power law, closer to the wave turbulence prediction than the Kolmogorov one like in the latter case. It is believed that the averaging effect may be a source of difficulty to detect the transition towards wave turbulence in natural plasmas. For the first time,

Author

Bigot, Barbara; Galtier, Sebastien; Politano, Helene

Published

2008

Language

EN