Abstract
Two-dimensional flow over two circular cylinders of different diameters in tandem arrangement at low Reynolds numbers has been numerically investigated in this study. The diameter ratio between the upstream control cylinder and the downstream one was varied from 0.1 to 1.0. The studied Reynolds number based on the diameter of the downstream main cylinder were 100 and 150. The gap between the control cylinder and the main cylinder ranged from 0.1 to 4.0 times the diameter of the main cylinder. Mutual interference between the two cylinders at close proximity, however, caused significant change in parameters of the hydrodynamic characteristics, such as fluctuating lift forces, fluctuating pressure distributions, when the spacing between the cylinders was changed. The changes in these hydrodynamic characteristics were systematically analyzed in this study. It is concluded that the gap ratio and the diameter ratio between the two cylinders have important effects on the lift coefficients and pressure distribution.
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