Influence of turbulence on the dynamo threshold
Fluid Dynamics
2016-08-16 v1 Astrophysics
Geophysics
Abstract
We use direct and stochastic numerical simulations of the magnetohydrodynamic equations to explore the influence of turbulence on the dynamo threshold. In the spirit of the Kraichnan-Kazantsev model, we model the turbulence by a noise, with given amplitude, injection scale and correlation time. The addition of a stochastic noise to the mean velocity significantly alters the dynamo threshold. When the noise is at small (resp. large) scale, the dynamo threshold is decreased (resp. increased). For a large scale noise, a finite correlation time reinforces this effect.
Cite
@article{arxiv.physics/0601062,
title = {Influence of turbulence on the dynamo threshold},
author = {Jean-Philippe Laval and Pierre Blaineau and Nicolas Leprovost and Bérengère Dubrulle and François Daviaud},
journal= {arXiv preprint arXiv:physics/0601062},
year = {2016}
}