2006/09/27 by Prasad Perlekar, Dhrubaditya Mitra, Rahul Pandit · 1 citation
Physics and Astronomy · #nlin.CD #cond-mat.soft #physics.flu-dyn
paper · pdf · doi:10.1103/physrevlett.97.264501
published as Phys. Rev. Lett. 97, 264501 (2006) · 4 pages, 3 figures
arxiv created 2006/09/27 · arxiv updated 2013/05/29
The existence of drag reduction by polymer additives, well established for wall-bounded turbulent flows, is controversial in homogeneous, isotropic turbulence. To settle this controversy we carry out a high-resolution direct numerical simulation (DNS) of decaying, homogeneous, isotropic turbulence with polymer additives. Our study reveals clear manifestations of drag-reduction-type phenomena: On the addition of polymers to the turbulent fluid we obtain a reduction in the energy dissipation rate, a significant modification of the fluid energy spectrum especially in the deep-dissipation range, a suppression of small-scale intermittency, and a decrease in small-scale vorticity filaments.