Subcritical dynamo bifurcation in the Taylor-Green flow.
Subcritical dynamo bifurcation in the Taylor-Green flow.
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泰勒-格林流中的亚临界发电机分岔。
DOI:
10.1103/physrevlett.99.224501
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发表时间:
2007
影响因子:
8.6
通讯作者:
J. Pinton
中科院分区:
文献类型:
--
作者:
Y. Ponty;J. Laval;B. Dubrulle;F. Daviaud;J. Pinton
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.