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Speed and structure of turbulent fronts in pipe flow
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Song, Baofang, Barkley, Dwight, Hof, Björn and Avila, Marc (2017) Speed and structure of turbulent fronts in pipe flow. Journal of Fluid Mechanics, 813 . pp. 1045-1059. doi:10.1017/jfm.2017.14 ISSN 0022-1120.
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Official URL: http://dx.doi.org/10.1017/jfm.2017.14
Abstract
Using extensive direct numerical simulations, the dynamics of laminar–turbulent fronts in pipe flow is investigated for Reynolds numbers between Re=2000Re=2000 and 5500. We here investigate the physical distinction between the fronts of weak and strong slugs both by analysing the turbulent kinetic energy budget and by comparing the downstream front motion to the advection speed of bulk turbulent structures. Our study shows that weak downstream fronts travel slower than turbulent structures in the bulk and correspond to decaying turbulence at the front. At Re≃2900Re≃2900 the downstream front speed becomes faster than the advection speed, marking the onset of strong fronts. In contrast to weak fronts, turbulent eddies are generated at strong fronts by feeding on the downstream laminar flow. Our study also suggests that temporal fluctuations of production and dissipation at the downstream laminar–turbulent front drive the dynamical switches between the two types of front observed up to Re≃3200Re≃3200.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QA Mathematics T Technology > TC Hydraulic engineering. Ocean engineering |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Mathematics | ||||||||
Library of Congress Subject Headings (LCSH): | Hydraulics, Fluid dynamics, Turbulence, Reynolds number | ||||||||
Journal or Publication Title: | Journal of Fluid Mechanics | ||||||||
Publisher: | Cambridge University Press | ||||||||
ISSN: | 0022-1120 | ||||||||
Official Date: | February 2017 | ||||||||
Dates: |
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Volume: | 813 | ||||||||
Page Range: | pp. 1045-1059 | ||||||||
DOI: | 10.1017/jfm.2017.14 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Date of first compliant deposit: | 1 February 2017 | ||||||||
Date of first compliant Open Access: | 2 February 2017 | ||||||||
Funder: | Deutsche Forschungsgemeinschaft (DFG), Seventh Framework Programme (European Commission) (FP7), European Research Council (ERC), China Scholarship Council (CSC), Max-Planck-Gesellschaft zur Förderung der Wissenschaften [Max Planck Society for the Advancement of Science], Institute of Science and Technology (Austria) (IST) | ||||||||
Grant number: | Project No. FOR 1182 (DFG), FP/2007-2013 (FP7), Grant Agreement 306589 (ERC), Grant number 201062914 (CSC) |
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