Abstract
In this study, the flow features of vortex shedding from tandem arranged circular cylinders oscillating along the direction of the flow and its characteristics of fluid force were simulated using a vortex method at the ranges of interval ratio L/d=1.5〜5.5, the amplitude ratios 2a/d=0 and 0.25, the frequency ratios f/f_k= 1.6 and f/f_k=2.8 and Reynolds number Re=620. As a result of calculations, it was confirmed that the calculated flow patterns of stationary case were in reasonable agreement with previous experimental results. The variation of fluid force and vortex shedding frequency was shown for every interval ratio L/d of tandem cylinders, and relationship between the 1st cylinder and the 2nd cylinder was clarified. In the flow pattern of oscillating tandem cylinders, although the vortex street of mushroom section form was formed, the twin vortex street was not formed. The influence of vibration appears notably in the 2nd cylinder.
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