Drag reduction by spanwise wall oscillation in wall-bounded turbulent flows

Jung Il Choi, Chun Xiao Xu, Hyung Jin Sung

Research output: Contribution to journalArticle

106 Citations (Scopus)

Abstract

Drag reduction in turbulent channel and pipe flows by spanwise (circumferential) wall oscillations is studied numerically. The influence of the wall oscillation on near-wall streamwise vortices is examined. By the use of the Stokes second problem, a wall-normal distance parameter and an acceleration parameter are obtained to estimate the drag reduction rate. A simple equation is derived for expressing the drag reduction rate by spanwise wall oscillations. The relation between near-wall streamwise vortices and low- and high-speed fluids is scrutinized to extract the key parameters. The drag reduction mechanism is analyzed in terms of the attenuation of Reynolds shear stress.

Original languageEnglish
Pages (from-to)842-850
Number of pages9
JournalAIAA journal
Volume40
Issue number5
DOIs
Publication statusPublished - 2002 May

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

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