Alpha effect in a family of chaotic flows.
Alpha effect in a family of chaotic flows.
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DOI：
10.1103/physrevlett.96.034503
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发表时间：
2006-01
影响因子：
8.6
通讯作者：
A. Courvoisier;D. Hughes;S. Tobias
中科院分区：
文献类型：
--
作者：
A. Courvoisier;D. Hughes;S. Tobias
我们进行数值实验来计算一个家庭的最大螺旋，混沌流的相关时间的范围内的运动学α效应。我们发现的值取决于流的结构，其相关时间和磁雷诺数在一个非平凡的方式。此外，似乎没有明确的关系α和螺旋度的流动，相反，通常假设的参数化的平均场发电机模型。
We perform numerical experiments to calculate the kinematic alpha effect for a family of maximally helical, chaotic flows with a range of correlation times. We find that the value of depends on the structure of the flow, on its correlation time and on the magnetic Reynolds number in a nontrivial way. Furthermore, it seems that there is no clear relation between alpha and the helicity of the flow, contrary to what is often assumed for the parametrization of mean-field dynamo models.