Relaminarization of turbulent channel flow using traveling wave-like wall deformation

Rio Nakanishi, Hiroya Mamori, Koji Fukagata

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

Effect of traveling wave-like wall deformation (i.e. peristalsis) in a fully developed turbulent channel flow is investigated by means of direct numerical simulation. We not only demonstrate that the friction drag is reduced by wave-like wall deformation traveling toward the downstream direction, but also show that the turbulence is completely suppressed (viz. the flow is relaminarized) under some sets of parameters. It is also found that at higher amplitude of actuation the relaminarized flow is unstable and exhibits a periodic cycle between high and low drag. The drag reduction is caused by suppression of random Reynolds shear stress component due to stabilization. The quadrant analysis reveals that traveling wave-like wall deformation makes strongly negative random Reynolds shear stress in the converging region.

Original languageEnglish
Pages (from-to)152-159
Number of pages8
JournalInternational Journal of Heat and Fluid Flow
Volume35
DOIs
Publication statusPublished - 2012 Jun 1

Keywords

  • Direct numerical simulation
  • Drag reduction
  • Relaminarization
  • Turbulent channel flow
  • Wall deformation

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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