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Characteristics of turbulent boundary layer large scale motions using direct fluctuating wall shear stress measurements

Rommel J. Pabon*, Lawrence Ukeiley, and Mark Sheplak

Casey Barnard Keane

  • University of Florida, Gainesville, Florida 32611, USA

  • Sandia National Laboratories, Albuquerque, New Mexico 87123, USA

  • *rjpabon91@ufl.edu
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Phys. Rev. Fluids 3, 114604 – Published 8 November, 2018

DOI: https://doi.org/10.1103/PhysRevFluids.3.114604

Abstract

This experimental work studies the impact large scale motions in a zero pressure gradient turbulent boundary layer have on the fluctuating streamwise wall shear stress component using a recently developed 1×1mm2 floating element differential capacitive shear stress sensor. The sensing system allows for a flat band response with a bandwidth up to 1.8 kHz (based on a ±3−dB limit). The streamwise velocity is measured using single component hot-wire anemometry. The experimental setup is first verified to have a canonical zero pressure gradient turbulent boundary layer using the mean and fluctuating velocity profiles as well as fits for the mean wall shear stress with respect to the operating Reynolds number. Characteristics of the large scale structure are examined spatially using Taylor's frozen field hypothesis and the lag time of peak levels of correlation between the shear stress and velocity signals. The large scale motion inclination angle is determined to be 16∘. The coherence between the signals demonstrate that low frequency motions dominate most of the boundary layer except nearest the wall. In addition, conditional sampling of velocity on shear stress provides conditional velocity statistics profiles which reveal information on the entire boundary layer during shear stress events, representing the qualitative features of the bursting-sweeping process.

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Phys. Rev. Fluids 3, 114604– Published 8 November, 2018
  • Received 14 June 2018
Article part of CHORUS
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