Flow characteristics in the near wake of a circular cylinder located close to a fully developed
turbulent boundary layer are investigated experimentally using particle image velocimetry
(PIV). The Reynolds number based on the cylinder diameter (D) is 1.2× 104 and the incident
boundary layer thickness (δ) is 0.4 D. Detailed velocity and vorticity fields in the wake region
(0< x/D< 6) are given for various gap heights (S) between the cylinder and the wall, with S/D
ranging from 0.1 to 1.0. Both the ensemble-averaged (including the mean velocity vectors …