Progress in understanding turbulent drag reduction by polymer additives has recently been
made on several fronts. The near-wall dynamics of Newtonian turbulence is becoming better …

This article provides a review of recent progress in understanding and predicting polymer
drag reduction (DR) in turbulent wall-bounded shear flows. The reduction in turbulent friction …

Flexible polymer additives are known to reduce the energy dissipation and friction drag in
turbulent flows. As the fluid elasticity increases, the flow undergoes several stages of …

Addition of a small amount of very large polymer molecules or micelle-forming surfactants to
a liquid can dramatically reduce the energy dissipation it exhibits in the turbulent flow …

Drag reduction by dilute polymer solutions is the most recognized phenomenon in wall-
bounded turbulent flows, which is associated with large scales (eg, velocity scales) in spite …

Polymers are remarkable molecules that have relaxation times that can span 15 orders of
magnitude. The very longest of the relaxation times for high molecular weight polymers are …

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 …

The addition of a small amount of polymers of high molecular weight can lead to a decrease
in the pressure drop in turbulent flows. Over the years, numerous studies have been …

In this work we systematically investigate the effects of the flow elasticity and inertia in
polymer-induced drag reduction through (pseudo) spectral simulations of a turbulent …

Turbulent channel flow of drag-reducing polymer solutions is simulated in minimal flow
geometries. Even in the Newtonian limit, we find intervals of “hibernating” turbulence that …