Wind tunnel experiment showed that the Ka´rma´n vortex excitation of a circular and a square cylinder is effectively suppressed by setting another cylindrical body downstream in a cruciform arrangement with a certain gap between them, and that the galloping of a square cylinder is also completely suppressed by the downstream cylinder. However, a new oscillation is induced over a velocity range higher than that of the Ka´rma´n vortex excitation, caused by longitudinal vortices which shed periodically around the crossing. These interference effects of the downstream cylinder on the upstream cylinder oscillation are different depending on the cross-sectional configuration of the cylinders.

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