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Manifestations of Drag Reduction by Polymer Additives in Decaying, Homogeneous, Isotropic Turbulence

Perlekar, Prasad and Mitra, Dhrubaditya and Pandit, Rahul (2006) Manifestations of Drag Reduction by Polymer Additives in Decaying, Homogeneous, Isotropic Turbulence. In: Physical Review Letters, 97 (26). 264501-1-264501-4.

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Abstract

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 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.

Item Type: Journal Article
Additional Information: Copy right of this article belongs to the American Physical Society
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 12 Mar 2007
Last Modified: 19 Sep 2010 04:34
URI: http://eprints.iisc.ernet.in/id/eprint/9677

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