Abstract
This paper presents the measurements of surface pressure distributions and velocity in the far wake of a step cylinder. It was found that the big cylinder generated higher drag force than the small cylinder. This difference in the drag force affected the wake generated behind the step cylinder. A perfect wake profile can be found behind the small cylinder and twin peak velocity profiles were found behind the big cylinder. As the velocity profiles are expressed as the defect with respect to the free stream velocity, the twin peak velocity profiles behind the big cylinder should be due to the ‘downwash’ effect from the small cylinder with relatively small obstruction to the flow.
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