Abstract
Circular cylinders modified with an axial slit and/or a concave rear notch were used to study the vortex-shedding phenomenon. Particular attention was paid to the Strouhal number/Reynolds number (St D/Re D) relationship and the determination of drag coefficient C D. For the modified cylinders, it was observed that the St D/Re D relationship was significantly different to that of a circular cylinder, particularly for the cylinder with a slit normal to the flow where St D was always higher than for a circular cylinder over the range of Re D examined (60<Re D<1000). At Re D≈2200, for a cylinder with a slit normal to the flow, and for a cylinder with both a slit normal to the flow and a concave rear surface, estimated values of C D of 1.41 and 2.52, respectively, were large compared to the value of 0.94 for a circular cylinder. Inspection of hot wire traces in the wake at x/ D=5 of the cylinder with both the slit and slit with concave rear notch modifications suggested a strong and stable vortex-shedding pattern for these cylinders compared to a circular cylinder at Re D≈2200.
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