[en] Numerical data of polymer drag reduced flows is interpreted in terms of modification of near-wall coherent structures. The originality of the method is based oil numerical experiments in which boundary conditions or the governing equations are modified in a controlled manner to isolate certain features of the interaction between polymers and turbulence. As it result, polymers are shown to reduce drag by damping near-wall vortices and sustain turbulence by injecting energy onto the streamwise velocity component in the very near-wall region.
Disciplines :
Mechanical engineering Chemical engineering
Author, co-author :
Dubief, Yves; Center for Turbulence Research, Stanford University
Terrapon, Vincent ; Stanford University > Mechanical Engineering Department
White, Christopher M; 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 :
New answers on the interaction between polymers and vortices in turbulent flows
Publication date :
2005
Journal title :
Flow, Turbulence and Combustion
ISSN :
1386-6184
eISSN :
1573-1987
Publisher :
Springer
Volume :
74
Issue :
4
Pages :
311-329
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
Friction Drag Reduction Program
Funders :
DARPA - Defense Advanced Research Projects Agency [US-VA] [US-VA]
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