Numerical Investigation of a Blade Riblet Surface for Drag Reduction Applications with Large Eddy Simulation Method

Nan Wu, Youhong Tang, Chengbi Zhao, Wei Lin, Xiao Chen, Run Li

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    Fully developed turbulent channel flow with a blade riblet surface has been simulated numerically at Reynolds number Reτ ≈ 210 by Large Eddy Simulations (LES). The blade riblet is shown to provide a total viscous drag reduction approximately 9% with the riblet spacing s+ =16.9 and the cross section Ag 1/2=11.6. For the sake of investigating the interaction of the turbulent flow with riblets, the mean velocity profiles, velocity fluctuations, and instantaneous flow visualization have been analyzed. It has been found that the riblet of certain size reduces drag by damping the dynamics and weakening the cross motions in the near-wall boundary layer, revealing beneficial turbulence controlling.

    Original languageEnglish
    Pages (from-to)315-319
    Number of pages5
    JournalApplied Mechanics and Materials
    Volume187
    DOIs
    Publication statusPublished - 2012

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