Small-scale universality in the spectral structure of transitional pipe flows
Small-scale universality in the spectral structure of transitional pipe flows
复制标题
过渡管流谱结构的小尺度普适性
DOI：
10.1126/sciadv.aaw6256
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发表时间：
2020
期刊：
影响因子：
13.6
通讯作者：
Chakraborty Pinaki
中科院分区：
文献类型：
--
作者：
Cerbus Rory T.;Liu Chien-chia;Gioia Gustavo;Chakraborty Pinaki
湍流不仅无处不在，而且每个湍流在小尺度上都是一样的。这种“小尺度普遍性”所带来的非凡的简化是湍流理论的一个标志。然而，根据A. N.为了证明这种普遍性，人们普遍认为，只有理想化的湍流符合这一框架。使用实验和模拟，跨越了很宽的范围内的雷诺数，我们表明，小尺度的普遍性管理的频谱结构的一类流量没有明显的联系，理想化的流量：过渡管流。我们的结果不仅超出了预期地扩展了Kolmogorov框架的普遍性，而且还在过渡管流和Kolmogorov湍流之间建立了意想不到的联系。
Turbulent flows are not only everywhere, but every turbulent flow is the same at small scales. The extraordinary simplification engendered by this “small-scale universality” is a hallmark of turbulence theory. However, on the basis of the restrictive assumptions invoked by A. N. Kolmogorov to demonstrate this universality, it is widely thought that only idealized turbulent flows conform to this framework. Using experiments and simulations that span a wide range of Reynolds number, we show that small-scale universality governs the spectral structure of a class of flows with no apparent ties to the idealized flows: transitional pipe flows. Our results not only extend the universality of Kolmogorov’s framework beyond expectation but also establish an unexpected link between transitional pipe flows and Kolmogorovian turbulence.