Turbulent drag reduction by transverse wall oscillations

Rashad Moarref, Mihailo R. Jovanovic

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Skin-friction drag reduction by transverse wall oscillations has received significant attention of flow control community. Both experiments and simulations have demonstrated that oscillations with properly selected amplitude and frequency can reduce turbulent drag by as much as 40 percent. For a turbulent channel flow, we develop a model-based approach to design oscillations that suppress turbulence. We show that judiciously selected linearization of the flow with control can be used to determine turbulent viscosity in a computationally efficient manner. The resulting correction to the turbulent mean velocity is then used to identify optimal frequency of oscillations, which is in close agreement with previously conducted experimental and numerical studies. This demonstrates the predictive power of our simulation-free approach to controlling turbulent flows.

Original languageEnglish (US)
Title of host publication2012 American Control Conference, ACC 2012
Pages3359-3364
Number of pages6
StatePublished - Nov 26 2012
Event2012 American Control Conference, ACC 2012 - Montreal, QC, Canada
Duration: Jun 27 2012Jun 29 2012

Publication series

NameProceedings of the American Control Conference
ISSN (Print)0743-1619

Other

Other2012 American Control Conference, ACC 2012
Country/TerritoryCanada
CityMontreal, QC
Period6/27/126/29/12

Keywords

  • Drag reduction
  • flow control
  • stochastically forced Navier-Stokes equations
  • time-periodic systems
  • turbulence modeling

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