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Turbulent channel flow of drag-reducing polymer solutions is simulated inminimal flow geometries. Even in the Newtonian limit, we find intervals of"hibernating" turbulence that display many features of the universal maximumdrag reduction (MDR) asymptote observed in polymer solutions: weak streamwisevortices, nearly nonexistent streamwise variations and a mean velocity gradientthat quantitatively matches experiments. As viscoelasticity increases, thefrequency of these intervals also increases, while the intervals themselves areunchanged, leading to flows that increasingly resemble MDR.

Active and hibernating turbulence in minimal channel flow of Newtonian and polymeric fluids