利用宇称不变时间周期流产生多尺度磁场
Generation of multiscale magnetic field by parity-invariant time-periodic flows
摘要：
我们研究产生的磁场，涉及大的空间尺度的时间和空间周期性的小尺度奇偶不变流。各向异性的磁涡扩散率张量的计算的标准程序涉及的扩展的磁模式和它们的增长率的幂级数的标度比。我们的模拟，与随机谐波成分和指数衰减的能量谱的流动进行，表明磁场的空间尺度的扩大是有益的生成时间周期性的流动。然而，总的来说，与稳定的流动相比，它们的发电机效率较低。
英文摘要：
We study generation of magnetic fields involving large spatial scales by time- and space-periodic small-scale parity-invariant flows. The anisotropic magnetic eddy diffusivity tensor is calculated by the standard procedure involving expansion of magnetic modes and their growth rates in power series in the scale ratio. Our simulations, conducted for flows with random harmonic composition and exponentially decaying energy spectra, demonstrate that enlargement of the spatial scale of magnetic field is beneficial for generation by time-periodic flows. However, they turn out, in general, to be less efficient dynamos, than steady flows.
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