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Large-scale coherent structures in compressible turbulent boundary layers

Published online by Cambridge University Press:  22 January 2021

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

The presence of large-scale coherent structures in various wall bounded turbulent flows, often called superstructures in turbulent boundary layers (TBLs), has been of great interest in recent years. These meandering high- and low-momentum structures can extend up to several boundary layer thicknesses in the streamwise direction and contain a relatively large portion of the layer's turbulent kinetic energy. Therefore, studying these features is important for understanding the overall dynamics of turbulent boundary layers and for the development of flow control strategies or near-wall flow modifications. However, compared to the extensive number of incompressible investigations, much less is known about the structural characteristics for compressible turbulent boundary layer flows. Therefore, in this investigation turbulent boundary layers developing on a flat plate with zero pressure gradient (ZPG) over a range of Reynolds numbers and Mach numbers are considered in order to examine the effect of compressibility on superstructures. More specifically, measurements are performed on a flat plate model in the Trisonic Wind Tunnel Munich (TWM) for the Mach number range $0.3 \leq Ma \leq 3.0$ and a friction Reynolds number range of $4700 \leq Re_{\tau } \leq 29\,700$ or $11\,730 \leq Re_{\delta _2} = \rho _e u_e \theta ^*/\mu _{w} \leq 74\,800$. Velocity fields are recorded using planar particle image velocimetry methods (PIV and stereo-PIV) in three perpendicular planes. Using multi-point correlation and spectral analysis methods it was found that the most energetic frequencies have slightly longer streamwise wavelengths for the supersonic case when compared to the subsonic case. Furthermore, a distinct increase in the spanwise spacing of the superstructures was found for the supersonic cases when compared to the subsonic and transonic turbulent boundary layers.

JFM classification

Compressible Flows: Compressible boundary layers Turbulent Flows: Turbulent boundary layers Boundary Layers: Boundary layer structure
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 911 , 25 March 2021 , A2
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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References

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