On the coherent drag-reducing and turbulence-enhancing behaviour of polymers in wall flows

Dubief, Yves; White, Christopher M.; Terrapon, Vincent; Shaqfeh, Eric S.G.; Moin, Parviz; Lele, Sanjiva K.

doi:10.1017/S0022112004000291

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Article (Scientific journals)

On the coherent drag-reducing and turbulence-enhancing behaviour of polymers in wall flows

Dubief, Yves; White, Christopher M.; Terrapon, Vincent et al.

2004 • In Journal of Fluid Mechanics, 514, p. 271-280

Peer Reviewed verified by ORBi

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https://hdl.handle.net/2268/96208

DOI
10.1017/S0022112004000291

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Keywords :

Drag reduction; Turbulence; Polymers; Wall flows

Abstract :

[en] Numerical simulations of turbulent polymer solutions using the FENE-P model are used to characterize the action of polymers on turbulence in drag-reduced flows. The energetics of turbulence is investigated by correlating the work done by polymers on the flow with turbulent structures. Polymers are found to store and to release energy to the flow in a well-organized manner. The storage of energy occurs around near-wall vortices as has been anticipated for a long time. Quite unexpectedly, coherent release of energy is observed in the very near-wall region. Large fluctuations of polymer work are shown to re-energize decaying streamwise velocity fluctuations in highspeed streaks just above the viscous sublayer. These distinct behaviours are used to propose an autonomous regeneration cycle of polymer wall turbulence, in the spirit of Jimenez & Pinelli (1999).

Disciplines :

Chemical engineering
Mechanical engineering

Author, co-author :

Dubief, Yves; Center for Turbulence Research, Stanford University

White, Christopher M.; Stanford University > Mechanical Engineering Department

Terrapon, Vincent ; Stanford University > Mechanical Engineering Department

Shaqfeh, Eric S.G.; Stanford University > Mechanical Engineering Department, Department of Chemical Engineering

Moin, Parviz; Center for Turbulence Research, Stanford University > Mechanical Engineering Department

Lele, Sanjiva K.; Stanford University > Mechanical Engineering Department, Department of Aeronautics and Astronautics

Language :

English

Title :

On the coherent drag-reducing and turbulence-enhancing behaviour of polymers in wall flows

Publication date :

2004

Journal title :

Journal of Fluid Mechanics

ISSN :

0022-1120

eISSN :

1469-7645

Publisher :

Cambridge University Press, New York, United States - New York

Volume :

514

Pages :

271-280

Peer reviewed :

Peer Reviewed verified by ORBi

Name of the research project :

Friction Drag Reduction Program

Funders :

DARPA - Defense Advanced Research Projects Agency

Available on ORBi :

since 28 July 2011

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