title: Distinct organizational States of fully developed turbulent pipe flow.
abstract: 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.
authors.affiliation: School of Engineering, University of Liverpool, Liverpool L69 3GH, United Kingdom.
authors.forename: David J C
authors.initials: DJ
authors.lastname: Dennis
authors.affiliation: School of Engineering, University of Liverpool, Liverpool L69 3GH, United Kingdom.
authors.forename: Francesca M
authors.initials: FM
authors.lastname: Sogaro