On using the streamwise traveling waves for variance suppression in channel flows

Rashad Moarref, Mihailo Jovanovic

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

2 Scopus citations

Abstract

We assess the efficacy of using a zero-net-mass-flux blowing and suction in the form of an upstream traveling wave for transition control in channel flows. Our study is motivated by a recent paper by Min et al. (J. Fluid Mech., vol. 558) where it was shown that this type of surface actuation yields a sustained sub-laminar drag in a fully developed channel flow. We develop models that govern the dynamics of velocity fluctuations in the presence of stochastic outside disturbances (such as free-stream turbulence and acoustic waves) and show how changes in control parameters affect the fluctuations' kinetic energy density. Effectively, we establish that properly designed streamwise traveling waves can be used to suppress variance of both the streamwise streaks and the Tollmien-Schlichting waves in transitional channel flows.

Original languageEnglish (US)
Title of host publicationProceedings of the 2007 American Control Conference, ACC
Pages2060-2065
Number of pages6
DOIs
StatePublished - Dec 1 2007
Event2007 American Control Conference, ACC - New York, NY, United States
Duration: Jul 9 2007Jul 13 2007

Publication series

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

Other

Other2007 American Control Conference, ACC
Country/TerritoryUnited States
CityNew York, NY
Period7/9/077/13/07

Keywords

  • Flow control
  • Input-output norms
  • Spatially periodic systems
  • Turbulence suppression

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