Pré-Publication, Document De Travail Année : 2007

Subcritical dynamo bifurcation in the Taylor Green flow

Résumé

We report direct numerical simulations of dynamo generation for flow generated using a Taylor-Green forcing. We find that the bifurcation is subcritical, and show its bifurcation diagram. We connect the associated hysteretic behavior with hydrodynamics changes induced by the action of the Lorentz force. We show the geometry of the dynamo magnetic field and discuss how the dynamo transition can be induced when an external field is applied to the flow.

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Dates et versions

hal-00163353 , version 1 (17-07-2007)
hal-00163353 , version 2 (23-07-2007)

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Yannick Ponty, Jean-Phillipe Laval, Bérengère Dubrulle, François Daviaud, Jean-François Pinton. Subcritical dynamo bifurcation in the Taylor Green flow. 2007. ⟨hal-00163353v2⟩
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