Multiple states in highly turbulent Taylor-Couette flow

The ubiquity of turbulent flows in nature and technology makes it of utmost importance to fundamentally understand turbulence. Kolmogorov's 1941 paradigm suggests that for strongly turbulent flows with many degrees of freedom and its large fluctuations, there would only be \emph{one} turbulent...

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Bibliographic Details
Published in:arXiv.org 2016-04
Main Authors: Huisman, Sander G, Roeland C A van der Veen, Sun, Chao, Lohse, Detlef
Format: Article
Language:English
Subjects:
Bifurcations
Couette flow
Cylinders
Fluid dynamics
Fluid flow
Reynolds number
Turbulence
Turbulent flow
Variations
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Summary:The ubiquity of turbulent flows in nature and technology makes it of utmost importance to fundamentally understand turbulence. Kolmogorov's 1941 paradigm suggests that for strongly turbulent flows with many degrees of freedom and its large fluctuations, there would only be \emph{one} turbulent state as the large fluctuations would explore the entire higher-dimensional phase space. Here we report the first conclusive evidence of multiple turbulent states for large Reynolds number \(\text{Re}=\mathcal{O}(10^6)\) (Taylor number \(\text{Ta}=\mathcal{O}(10^{12})\)) Taylor-Couette flow in the regime of ultimate turbulence, by probing the phase space spanned by the rotation rates of the inner and outer cylinder. The manifestation of multiple turbulent states is exemplified by providing combined global torque and local velocity measurements. This result verifies the notion that bifurcations can occur in high-dimensional flows i.e. very large \(\text{Re}\)) and questions Kolmogorov's paradigm.
ISSN:2331-8422
DOI:10.48550/arxiv.1604.04410