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The onset of dynamic stall at a high, transitional Reynolds number

Published online by Cambridge University Press:  28 December 2018

S. I. Benton Open the ORCID record for S. I. Benton [Opens in a new window]  and
M. R. Visbal
S. I. Benton*
Affiliation:
Air Force Research Laboratory, Wright-Patterson AFB, OH 45433, USA
M. R. Visbal
Affiliation:
Air Force Research Laboratory, Wright-Patterson AFB, OH 45433, USA
*
†Email address for correspondence: [email protected]
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Abstract

Dynamic stall due to a ramp-type pitching motion is investigated on the NACA 0012 airfoil at chord Reynolds number of $Re_{c}=1.0\times 10^{6}$ through the use of wall-resolved large-eddy simulation. Emphasis is placed on the unsteady boundary-layer interactions that develop as the airfoil approaches stall. At this Reynolds number it is shown that turbulent separation moves upstream across much of the airfoil suction surface. When turbulent separation reaches the leading-edge separation bubble, a bursting event is initiated leading to a strong coherent leading-edge vortex structure. This vortex wraps up the turbulent shear layer to form a large dynamic stall vortex. The use of large-eddy simulation elucidates the roll of the laminar separation bubble in defining the onset of the dynamic stall process. Comparisons are made to identical simulations at lower Reynolds numbers of $Re_{c}=0.2\times 10^{6}$ and $0.5\times 10^{6}$. This comparison demonstrates trends in the boundary-layer mechanics that explain the sensitivity of the dynamic stall process to Reynolds number.

JFM classification

Aerodynamics: Aerodynamics Boundary Layers: Boundary Layers Vortex Flows: Vortex Flows
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 861 , 25 February 2019 , pp. 860 - 885
Copyright
© 2018 Cambridge University Press 

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Benton and Visbal supplementary movie

Contour of entropy visualizing the dynamic-stall process at z/c = 0.025 during the unsteady pitching motion. This movie animates the visualizations in Figures 5, 10, and 14 in the text.

Download Benton and Visbal supplementary movie(Video)
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