Distinct organizational States of fully developed turbulent pipe flow.

Phys Rev Lett

School of Engineering, University of Liverpool, Liverpool L69 3GH, United Kingdom.

Published: December 2014

Organizational states of turbulence are identified through novel analysis of large scale pipe flow experiments at a Reynolds number of 35 000. The distinct states are revealed by an azimuthal decomposition of the two-point spatial correlation of the streamwise velocity fluctuation. States with dominant azimuthal wave numbers corresponding to k_{θ}=2,3,4,5,6 are discovered and their structure revealed as a series of alternately rotating quasistreamwise vortices. Such organizational states are highly reminiscent of the nonlinear traveling wave solutions previously identified at Reynolds numbers an order of magnitude lower.

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http://dx.doi.org/10.1103/PhysRevLett.113.234501DOI Listing

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