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Interaction of coherent flow structures in adverse pressure gradient turbulent boundary layers

Published online by Cambridge University Press:  24 June 2019

Matthew Bross Open the ORCID record for Matthew Bross [Opens in a new window] ,
Thomas Fuchs Open the ORCID record for Thomas Fuchs [Opens in a new window]  and
Christian J. Kähler
Matthew Bross*
Affiliation:
Institute of Fluid Mechanics and Aerodynamics, Universität der Bundeswehr München, 85577 Neubiberg, Germany
Thomas Fuchs
Affiliation:
Institute of Fluid Mechanics and Aerodynamics, Universität der Bundeswehr München, 85577 Neubiberg, Germany
Christian J. Kähler
Affiliation:
Institute of Fluid Mechanics and Aerodynamics, Universität der Bundeswehr München, 85577 Neubiberg, Germany
*
†Email address for correspondence: matthew.bross@unibw.de
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Abstract

With the aim to characterize the near-wall flow structures and their interaction with large-scale motions in the log-law region, time-resolved planar and volumetric flow field measurements were performed in the near-wall and log-law region of an adverse pressure gradient turbulent boundary layer following a zero pressure gradient turbulent boundary layer at a friction Reynolds number $Re_{\unicode[STIX]{x1D70F}}=5000$. Due to the high spatial and temporal resolution of the measurements, it was possible to resolve and identify uniform-momentum zones in the region $z/\unicode[STIX]{x1D6FF}<0.15$ or $z^{+}<350$ and to relate them with well known coherent flow motions near the wall. The space–time results confirm that the turbulent superstructures have a strong impact even on the very near-wall flow motion and also their alternating appearance in time and intensity could be quantified over long time sequences. Using the time record of the velocity field, rare localized separation events appearing in the viscous sublayer were also analysed. By means of volumetric particle tracking velocimetry their three-dimensional topology and dynamics could be resolved. Based on the results, a conceptual model was deduced that explains their rare occurrence, topology and dynamics by means of a complex interaction process between low-momentum turbulent superstructures, near-wall low-speed streaks and tilted longitudinal and spanwise vortices located in the near-wall region.

JFM classification

Boundary Layers: Boundary layer structure Turbulent Flows: Turbulent boundary layers

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JFM Papers
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Journal of Fluid Mechanics , Volume 873 , 25 August 2019 , pp. 287 - 321
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© 2019 Cambridge University Press 

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Bross et al. supplementary movie 1

Uniform momentum zone time series in the near-wall region.

Download Bross et al. supplementary movie 1(Video)
Video 7.9 MB

Bross et al. supplementary movie 2

Three-dimensional trajectories below z+< 9 colored with u velocity component. Reverse flow is indicated in light purple shading.

Download Bross et al. supplementary movie 2(Video)
Video 10.2 MB