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- W1970083335 abstract "A quasi-steady mathematical model is presented for predicting the galloping instability of an elastic circular cylinder, with oscillations restricted to a plane normal to the incident flow, in the wake of a stationary parallel circular cylinder. The theory predicts that the mean (time-invariant) position of the flexible body varies with the cylinder lift forces and the free-stream dynamic pressure, except when it is exactly in-line with the rigid cylinder. An increase in the cylinder mass or damping causes the galloping to occur at a higher flow velocity. However, in an in-line arrangement, this increase has no effect at all on the variation of the reduced (relative) vibration amplitude with the twice-reduced flow velocity and also on that of the twice-reduced motion frequency against the reduced oscillation amplitude, the former variation being dependent on the wake velocity distribution and the cylinder drag forces while the latter is only a function of the lift forces. In this arrangement, the onset velocity for galloping is directly proportional to the wake velocity on the centreline. The theory indicates that the self-excited galloping instability occurs only when the downstream body is in the near wake of the upstream one. Further, in an out-of-line arrangement the extent of self-excitation downstream of the rigid cylinder may increase with increased flow velocity, whereas in an in-line arrangement this extent is a function only of cylinder separation." @default.
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- W1970083335 date "1989-01-01" @default.
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- W1970083335 title "Galloping of a circular cylinder in the wake of another" @default.
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- W1970083335 doi "https://doi.org/10.1016/0022-460x(89)90681-0" @default.
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