Turbulence intensity Tu, mean streamwise velocity U, mean upwash velocity W and turbulence intensity Tu_St frequency filtered from St = 8 to St = 18, 15° angle of attack, Re = 150,000: baseline (left), end plate pressure side (middle), end plate suction side (right), (measurement plane located 0.1 chord lengths downstream of the airfoil (see Fig. 3b), white dashed line indicates trailing edge – vertical line indicates end plate (suction side above).