Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
A study of boundary layer developing under adverse pressure gradients for a NACA0012 airfoil at high angle of attack.
Submission Author:
Leandro Júnio Oliveira Silva , SP
Co-Authors:
Leandro Júnio Oliveira Silva, William Wolf
Presenter: William Wolf
doi://10.26678/ABCM.COBEM2023.COB2023-0141
Abstract
A wall-resolved large eddy simulation (LES) is applied to investigate the effects of varying adverse pressure gradients (APGs) on a turbulent boundary layer developing over an airfoil NACA0012 at 9 deg. angle of attack, Reynolds number of Re_c = 400,000 and freestream Mach number M = 0.2. The impact of the APG on the integral quantities of the boundary layer are investigated, as well as the Clauser pressure-gradient parameter. Turbulence statistics are evaluated in terms of the inner-scaled mean velocity profiles and Reynolds-stress tensors. These statistics are compared at different positions along the airfoil chord which allows an evaluation of the influence of different APGs. Due to the effects of the APGs, the mean velocity profiles present a downward shift in the log-layer and the normalized velocity in the potential flow region increases. The Reynolds-stress tensor components also increase due to pressure gradient effects and the tangential component presents a secondary peak in the outer layer.
Keywords
pressure gradient, Boundary Layer, LES, turbulence statistics
