Although drag reduction due to the addition of small amounts of long-chain polymers has
been a well-known phenomenon for about fifty years, its mechanism is still poorly …

An efficient technique for drag reduction uses dilute solutions of a few ppm of polymers. A
possible reduction in drag of up to 80% is achieved. Several experimental observations …

Much progress in understanding the phenomenon of turbulent drag reduction by polymer
additives has been made since its first experimental observation. While the use of direct …

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 …

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 …

Drag reduction using polymer additives in wall-bounded ilows poses many challenges to am
understanding of turbulence and polymer dynamics, due to the large spectrum of scales …

It is well known that the drag in a turbulent flow of a polymer solution is significantly reduced
compared to Newtonian flow. Here we consider this phenomenon by means of a direct …

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 on numerical experiments in …

The mechanism of drag reduction in turbulent flows due to polymers has been investigated
with help of a direct numerical simulation. In particular, we consider the interaction between …

Polymer-induced drag reduction is the phenomenon by which the friction factor of a turbulent
flow is reduced by the addition of small amounts of high-molecular-weight linear polymers …