Normal and shear stresses in an axisymmetric turbulent boundary layer on a cylinder

H. G. Nepomuceno*, Richard M Lueptow

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

Abstract

The fluctuating wall shear stress, wall pressure, and streamwise velocity were measured simultaneously in a cylindrical boundary layer at a momentum thickness Reynolds number of Reθ = 2160 and a boundary layer thickness to cylinder radius ratio of δa = 5 using a hot wire wall shear stress probe mounted just upstream of a hearing aid microphone and a hot wire velocity probe. Variable Interval Time Averaging (VITA) event detection on streamwise velocity indicates that streamwise accelerations (decelerations) are associated with positive (negative) wall pressure peaks and sudden increases (decreases) in wall shear stress. Likewise, positive pressure peak events are associated with streamwise accelerations and sudden increases in wall shear stress. On the other hand, negative pressure peaks coincide with modest streamwise decelerations and fluctuations in the wall shear stress, rather than sharp decreases. VITA detection on wall shear stress reveals that increases (decreases) in wall shear stress correspond to streamwise accelerations (decelerations) and small-amplitude pressure rises (depressions), not distinct intense pressure peaks. A shear layer at y+ = 13 coincides with a positive peak in the wall pressure for both strong adverse and strong favorable pressure gradient events. This result along with a shear layer coinciding with the pressure peak for positive pressure peak events indicate that positive wall pressure peaks are the ″fundamental″ wall pressure signature associated with the burst cycle.

Original languageEnglish (US)
Pages119-128
Number of pages10
StatePublished - Dec 1 1995
EventProceedings of the 1995 ASME International Mechanical Engineering Congress and Exposition - San Francisco, CA, USA
Duration: Nov 12 1995Nov 17 1995

Other

OtherProceedings of the 1995 ASME International Mechanical Engineering Congress and Exposition
CitySan Francisco, CA, USA
Period11/12/9511/17/95

ASJC Scopus subject areas

  • Mechanical Engineering
  • Acoustics and Ultrasonics

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