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Turbulence structures and statistics of a supersonic turbulent boundary layer subjected to concave surface curvature

Published online by Cambridge University Press:  18 February 2019

Mingbo Sun Open the ORCID record for Mingbo Sun [Opens in a new window] ,
Neil D. Sandham Open the ORCID record for Neil D. Sandham [Opens in a new window]  and
Zhiwei Hu
Mingbo Sun*
Affiliation:
Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, China Aerodynamics and Flight Mechanics, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK
Neil D. Sandham
Affiliation:
Aerodynamics and Flight Mechanics, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK
Zhiwei Hu
Affiliation:
Aerodynamics and Flight Mechanics, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK
*
†Email address for correspondence: sunmingbo@nudt.edu.cn
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Abstract

Supersonic turbulent flows at Mach 2.7 over concave surfaces for two different radii of curvature were investigated and compared with a flat plate turbulent boundary layer using direct numerical simulations. The streamwise velocity reduces in the outer part of the boundary layer due to compression, while it increases near the wall due to curvature, with a higher shape factor for the concave cases. The near-wall spanwise streak spacing reduces compared to the flat plate, with large-scale streaks and turbulence amplification also observed. Streamwise velocity iso-surfaces and streamlines show the generation of Görtler-like vortices, consistent with significant centrifugal effects. Abundant small vortices are shown to be associated with large baroclinic production of vorticity that is caused by the density and pressure gradients that are associated with concave compression. Profiles of turbulent kinetic energy and turbulent Mach number exhibit a characteristic two-layer structure in the concave boundary layer cases. In the outer layer, turbulence is greatly amplified, whereas a local balance exists in the inner layer. Turbulent energy budget analysis shows that both production and dissipation increase near the concave wall, whereas in the outer part of the boundary layer, the production is increased and ultimately balanced by convection and turbulent transport.

JFM classification

Boundary Layers: Boundary layer structure Compressible Flows: Compressible boundary layers Aerodynamics: High-speed flow
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 865 , 25 April 2019 , pp. 60 - 99
Copyright
© 2019 Cambridge University Press 

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