Ponty Y, Laval J-P, Dubrulle B, Daviaud F, Pinton J-F
Laboratoire Cassiopée, CNRS & Observatoire de la Côte d'Azur, Nice 06304, France.
Phys Rev Lett. 2007 Nov 30;99(22):224501. doi: 10.1103/PhysRevLett.99.224501. Epub 2007 Nov 29.
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.
我们报告了使用泰勒 - 格林力生成流的发电机产生的直接数值模拟。我们发现该分岔是亚临界的,并展示了其分岔图。我们将相关的滞后行为与洛伦兹力作用引起的流体动力学变化联系起来。我们展示了发电机磁场的几何形状,并讨论了当向流中施加外部场时如何引发发电机转变。