The shedding of vortices and flow interference between two circular cylinders in a tandem arrangement is investigated numerically in this paper. The simulations are carried out for cylinders with different diameters. The upstream cylinder has a diameter twice the diameter of the downstream cylinder. The simulations are accomplished for various values of the gap between the cylinders. The Fractional Step Method is used for the simulations and the flow is assumed two-dimensional. The calculations are carried out on a three-nodded unstructured mesh. All the simulations are performed for Reynolds number equal to 200 and the flow is solved through the Finite Volume Method. The mesh is finer close to the cylinder wall in order to have a better description of the boundary layer.
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