Abstract :
[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.
Dubief, Yves; Center for Turbulence Research, Stanford University
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
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