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

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 fol...

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Bibliographic Details
Published in:Journal of fluid mechanics 2019-08, Vol.873, p.287-321
Main Authors: Bross, Matthew, Fuchs, Thomas, Kähler, Christian J.
Format: Article
Language:English
Subjects:
Boundary layers
Computational fluid dynamics
Dynamics
Energy
Flow structures
Flow velocity
Fluid flow
JFM Papers
Low speed
Measurement techniques
Momentum
Particle tracking
Particle tracking velocimetry
Pressure
Pressure gradients
Reynolds number
Superstructures
Temporal resolution
Topology
Turbulent boundary layer
Velocity distribution
Velocity measurement
Viscous sublayers
Vortices
Wall flow
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Summary: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}
ISSN:0022-1120
1469-7645
DOI:10.1017/jfm.2019.408