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Influence of turbulence on the dynamo threshold

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.

preprint2006arXivOpen access
Jean-Philippe LavalPierre BlaineauNicolas LeprovostBérengère DubrulleFrançois Daviaud
astro-phphysics.geo-phphysics.flu-dyn
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Open access5 authors3 topics
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Jean-Philippe LavalPierre BlaineauNicolas LeprovostBérengère DubrulleFrançois Daviaud

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