Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division August 6, 2003; revised manuscript received March 15, 2004. Associate Editor: H. Johari.

It is well known that a large-amplitude oscillation called galloping 1,2,3 is generated, in addition to Ka´rma´n vortex excitation, for rectangular cylinders supported perpendicularly to a uniform flow when the slenderness b/d is in the range of 0.6 to 2.8 (d=height, b=streamwise length of the rectangular cross-section). The basic aerodynamic excitation mechanism of the cross-flow galloping of a rectangular cylinder is explained by the quasi-steady nonlinear aerodynamic theory developed by Parkinson et al. 4. In this theory, the relative attack angle plays an important role in the excitation mechanism of galloping. Also, as was shown by Deniz and Staubli 5...

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