Uniform blowing and suction applied to nonuniform adverse-pressure-gradient wing boundary layers
Marco Atzori, Ricardo Vinuesa, Alexander Stroh, Davide Gatti, Bettina Frohnapfel, Philipp Schlatter
Abstract
We study different flow control methods on turbulent flow around a NACA4412 airfoil, using resolved large-eddy simulation (LES). We find that changes in total skin friction due to blowing and suction are not very sensitive to different pressure-gradient conditions nor the Reynolds number. However, the boundary-layer thickness, the intensity of the wall-normal convection, and turbulent fluctuations are much more affected, mostly due to the adverse-pressure-gradient conditions, as skin-friction decompositions show. Overall, we conclude that it is not possible to simply separate pressure-gradient and control effects, which is important for control design in practical applications.