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arXiv 1503.07498physics.plasm-phphysics.ao-ph
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作为斑图形成的带状流

Zonal Flow as Pattern Formation

Jeffrey B. Parker, John A. Krommes

摘要:

在这一节中,我们研究从统计上均匀的湍流过渡到非均匀湍流的带状流。统计运动方程可以从Hasegawa-Mima方程的准线性近似导出。我们回顾了最近的工作,发现这些方程的分歧,并表明,出现纬向流数学遵循一个标准类型的斑图形成。我们还表明,在一定限度内,调制不稳定性的色散关系可以从统计运动方程中提取出来。因此,可以认为统计公式提供了一个更一般的角度来看相干结构的增长,即通过一个完整的湍流谱的不稳定性。最后,我们对大尺度结构的生长提供了一个物理视角。

英文摘要:

In this section, we examine the transition from statistically homogeneous turbulence to inhomogeneous turbulence with zonal flows. Statistical equations of motion can be derived from the quasilinear approximation to the Hasegawa-Mima equation. We review recent work that finds a bifurcation of these equations and shows that the emergence of zonal flows mathematically follows a standard type of pattern formation. We also show that the dispersion relation of modulational instability can be extracted from the statistical equations of motion in a certain limit. The statistical formulation can thus be thought to offer a more general perspective on growth of coherent structures, namely through instability of a full turbulent spectrum. Finally, we offer a physical perspective on the growth of large-scale structures.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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