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Taming turbulent fronts by bending pipes

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Barkley, Dwight (2019) Taming turbulent fronts by bending pipes. Journal of Fluid Mechanics, 872 . pp. 1-4. doi:10.1017/jfm.2019.340

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Official URL: https://doi.org/10.1017/jfm.2019.340

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Abstract

The flow of fluid through a pipe has been instrumental in illuminating the subcritical route to turbulence typical of many wall-bounded shear flows. Especially important in this process are the turbulent–laminar fronts that separate the turbulent and laminar flow. Four years ago Michael Graham (Nature, vol. 526, 2015, p. 508) wrote a commentary entitled ‘Turbulence spreads like wildfire’, which is a picturesque but also accurate characterisation of the way turbulence spreads through laminar flow in a straight pipe. In this spirit, the recent article by Rinaldi et al. (J. Fluid Mech., vol. 866, 2019, pp. 487–502) shows that turbulent wildfires are substantially tamed in bent pipes. These authors find that even at modest pipe curvature, the characteristic strong turbulent–laminar fronts of straight pipe flow vanish. As a result, the propagation of turbulent structures is modified and there are hints that the route to turbulence is fundamentally altered.

Item Type: Journal Item
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Mathematics
Library of Congress Subject Headings (LCSH): Shear flow, Fluid dynamics
Journal or Publication Title: Journal of Fluid Mechanics
Publisher: Cambridge University Press
ISSN: 0022-1120
Official Date: August 2019
Dates:
DateEvent
August 2019Published
4 June 2019Available
Volume: 872
Page Range: pp. 1-4
DOI: 10.1017/jfm.2019.340
Status: Not Peer Reviewed
Publication Status: Published
Publisher Statement: This article has been published in a revised form in Journal of Fluid Mechanics https://doi.org/10.1017/jfm.2019.340. This version is free to view and download for private research and study only. Not for re-distribution or re-use. © 2019 Cambridge University Press
Access rights to Published version: Restricted or Subscription Access

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