Abstract
In this paper we describe the flow around two-dimensional circular cylinder bundles supported by wires in the staggered arrangement. The experiment was carried out in an N. P. L. blow-down-type wind-tunnel with a working section of 400 mm×400 mm×2 000 mm, and with the Reynolds number of 1.2×104. The displacement, time-mean pressure distributions, and fluctuating pressure distributions of the oscillating circular cylinder were measured. The results were compared with those for the cases of the square arrangement. Consequently it was found that (i) while the displacement amplitude in X direction is nearly equal to that in Y direction, the occurrence of the fluid-elastic vibration is due to the hybrid phenomenon of jet switch and wake switch (ii) the variation of fluctuating drag coefficient and fluctuating lift coefficient corresponds to that of displacement of an oscillating cylinder, and increase rapidly with the occurrence of the vibration.
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