Drag reduction by polymers in turbulent channel flows: Energy redistribution between invariant empirical modes.

@article{DeAngelis2003DragRB,
  title={Drag reduction by polymers in turbulent channel flows: Energy redistribution between invariant empirical modes.},
  author={Elisabetta De Angelis and Carlo Massimo Casciola and Victor S L’vov and Renzo Piva and Itamar Procaccia},
  journal={Physical review. E, Statistical, nonlinear, and soft matter physics},
  year={2003},
  volume={67 5 Pt 2},
  pages={
          056312
        }
}
We address the phenomenon of drag reduction by a dilute polymeric additive to turbulent flows, using direct numerical simulations (DNS) of the FENE-P model of viscoelastic flows. It had been amply demonstrated that these model equations reproduce the phenomenon, but the results of DNS were not analyzed so far with the goal of interpreting the phenomenon. In order to construct a useful framework for the understanding of drag reduction we initiate in this paper an investigation of the most… 

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