Turbulence structure in oscillating channel flow

Sean P. Kearney, Timothy J. O'Hern, Thomas W. Grasser, Thomas G. Dimiduk, Jesse D. Roberts, Joseph Z. Gailani

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

Abstract

The structure of turbulence in an oscillating channel flow with near-sinusoidal fluctuations in bulk velocity is investigated. Phase-locked particle-image velocimetry data in the streamwise/wall-normal plane are interrogated to reveal the phase-modulation of two-point velocity correlation functions and of linear stochastic estimates of the velocity fluctuation field given the presence of a vortex in the logarithmic region of the boundary layer. The results reveal the periodic modulation of turbulence structure between large-scale residual disturbances, relaminarization during periods of strong acceleration, and a quasi-steady flow with evidence of hairpin vortices, which is established in the acceleration phase and persists through much of the deceleration period.

Original languageEnglish (US)
Title of host publication47th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Print)9781563479694
DOIs
StatePublished - 2009
Externally publishedYes

Publication series

Name47th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering

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