Flow characteristics of a bluff body cut from a circular cylinder

This is a report on an investigation of the flow characteristics of a bluff body cut from a circular cylinder. The volume removed from the cylinder is equal to d/2 (1 - cos theta(s)), where d and theta(s) are the diameter and the angular position (in the case of a circular cylinder, theta(s) = 0 deg), respectively. theta(s) ranged from 0 deg to 72.5 deg and R-e (based on d and the upstream uniform flow velocity U-infinity from 2.0 x 10(4) to 3.5 x 10(4). It is found that a singular flow around the cylinder occurs at around theta(s) = 53 deg when R-e > 2.5 x 10(4), and the base pressure coefficient (-C-pb and the drag coefficient C-D take small values compared with those for other theta(s).