Manifestations of drag reduction by polymer additives in decaying, homogeneous, isotropic turbulence

P. Perlekar, D. Mitra, R. Pandit

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    56 Citations (Scopus)
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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.
    Original languageEnglish
    Pages (from-to)264501-1/4
    JournalPhysical Review Letters
    Volume97
    Issue number26
    DOIs
    Publication statusPublished - 2006

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