Abstract
This paper describes the effect of the spacing between two adjoining circular cylinders on the flow around two-dimensional circular cylinder bundles of three rows in forced vibration. The experiment was carried out in an N. P. L. blow-down-type wind tunnel with a working section of 400×400×2000mm, at the Reynolds number 9.4×103. The flow visualization experiment was done in water channel. The cylinders were then forced to oscillate sinusoidally in the lift direction. The time-mean and fluctuating surface pressure distribution on the circular cylinder were measured for the displacement in the vibration. The present results were compared with those for the case of fixed circular cylinder, the first report and the existing results. Consequently it was found that (i) the phase lead occurs between fluctuating lift and vibrating displacement in an in-phase mode vibration and an out of phase lead occurs between fluctuating lift and vibrating displacement in an in-phase mode vibration and an out of phase one, and (ii) the fluid-elastic vibration is due to the wake switch phenomenon for three rows circular cylinder bundles.
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