Drag reduction in homogeneous turbulence by scale-dependent effective viscosity
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AbstractWe demonstrate, by using suitable shell models, that drag reduction in homogeneous turbulence is usefully discussed in terms of a scale-dependent effective viscosity. The essence of the phenomenon of drag reduction found in models that couple the velocity field to the polymers can be recaptured by an "equivalent" equation of motion for the velocity field alone, with a judiciously chosen scale-dependent effective viscosity that succinctly summarizes the important aspects of the interaction between the velocity and the polymer fields. Finally, we clarify the differences between drag reduction in homogeneous and in wall bounded flows.
All Author(s) ListBenzi R, Ching ESC, Procaccia I
Journal namePhysical Review E
Volume Number70
Issue Number2
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesPhysics; Physics, Fluids & Plasmas; Physics, Mathematical

Last updated on 2020-29-09 at 01:03