Fine Structure of Reynolds Shear Stress in an Unsteady Turbulent Channel Flow

  • S. Tardu
  • M. Q. Feng
  • G. Binder
Conference paper


The modulation characteristics of the Reynolds shear stresses in an unsteady channel flow are presented. The imposed frequency covers a large range going from the quasi-steady limit to 2 times the ejection frequency at y + = 15. The time mean contributions of the quadrants to the Reynolds shear stress are unaffected by the imposed unsteadiness. The contributions of the second and fourth quadrants are strongly modulated near the imposed frequency in wall units f + ≈ 0.002, where the modulation of the ejection frequency is weak and the phase shift with respect to the centerline velocity is maximum. In the low frequency regime the ejection frequency is modulated as the wall shear stress according to the quasi-steady behaviour, and the decline in its response in the high imposed frequency regime stretches from the near-wall to the outer layer.


Wall Shear Stress Relative Amplitude Modulation Characteristic Reynolds Shear Stress Centerline Velocity 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1995

Authors and Affiliations

  • S. Tardu
    • 1
  • M. Q. Feng
    • 1
  • G. Binder
    • 1
  1. 1.Laboratoire des Ecoulements Géophysiques et Industriels, INPG, UJF, CNRSInstitut de Mécanique de GrenobleGrenoble Cedex 9France

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