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Evolution of Vortices Behind Single Diamond-Shaped Cylinders in Free Stream


 Two-dimensional flow over a single diamond-shaped cylinder in the free stream are experimentally and theoretically investigated. The experimental program includes visualization of the flow field using the tracer method. In the theoretical program, the Navier-Stoeks equations are discretized using finite difference methods to determine the time history of velocity vector distribution in the flow field. Efforts directed to examine the effects of the Reynolds number, Re, and the upstream angle of the diamond shape, θ, on flow phenomena. The study discloses that (i) the generation of von Karman vortex streets behind the diamond-shaped cylinder are intensified with an increase in the Reynolds number, (ii) the flow pattern in the wake region of the diamond-shaped island is affected by θ, and (iii) the relationship among the Strouhal number, St, Re and θ is determined and compared with the existing St-Re relationship for flow over a circular cylinder.