This paper reports an experimental study of turbulent wake of a two-dimensional rectangular cylinder in a 2500 mm long, 186 mm wide and 197 mm deep re-circulating open channel. The water level upstream of the cylinder was maintained at 100 mm whereas the aspect and blockage ratios defined, respectively, as the cylinder's length to thickness ratio and cylinder thickness to water depth ratio were 9 and 0.12. The cylinder was mounted across the channel at three different vertical locations: relatively close to the plane wall, close to the free surface, and relatively remote from both the plane wall and free surface. For each of the above three locations, a particle image velocimetry technique was used to conduct detailed measurements at various streamwise-transverse planes around and downstream of the cylinder. From these measurements, the streamlines, iso-contours of mean vorticity as well as the mean velocities and turbulent quantities were obtained to document the effects of plane wall and free surface on the flow characteristics.
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