The unsteady flows past a NACA0015 airfoil near stall at a high Reynolds number are investigated numerically using the delayed detached-eddy simulation with adaptive coefficient model. The unsteady feature is primarily represented by a low-frequency oscillation, attributed to the quasi-period movement of the separation point. Correlation analysis between the instantaneous lift coefficient and separation point location indicates that the two signals present nearly in-phase behavior. Other unsteady characteristics such as the trailing-edge vortex shedding and instability of the upper surface shear layer are also analyzed. Since the Strouhal number corresponding to the movement of the separation point based on the projected airfoil height varies significantly with the angle of attack, the normalized Strouhal number based on the length of the recirculation region is observed to have a value of approximately 0.036 and be insensitive to the angle of attack.
Low-Frequency Oscillation over NACA0015 Airfoil Near Stall at High Reynolds Number
AIAA Journal ; 58 , 1 ; 53-60
2019-09-05
8 pages
Article (Journal)
Electronic Resource
English
Flow oscillation over an airfoil near stall
AIAA | 1996
|Measurement of Three-Dimensional Stall Cells on a Two-Dimensional NACA0015 Airfoil
Online Contents | 2016
|Flow Oscillation over an Airfoil Near Stall (TN)
Online Contents | 1996
|Measurement of Three-Dimensional Stall Cells on a Two-Dimensional NACA0015 Airfoil
Online Contents | 2016
|Induced Stall Cells on a NACA0015 Airfoil Using Passive and Active Trips
British Library Conference Proceedings | 2016
|