Flow Characteristics of a Bluff Body Cut From a Circular Cylinder

Abstract

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 θs ), where d and θs are the diameter and the angular position (in the case of a circular cylinder, θs , = 0 deg), respectively. θs , ranged from 0 deg to 72.5 deg and Re (based on d and the upstream uniform flow velocity U∞ ) from 2.0 × 104 to 3.5 × 104 . It is found that a singular flow around the cylinder occurs at around θs = 53 deg when Re > 2.5 × 104 , and the base pressure coefficient (−Cpb ,) and the drag coefficient CD take small values compared with those for otherθs .