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• W2067945667 abstract "Ovalling oscillations were originally thought to be excited subharmonically by vortex shedding, such that, at the onset of ovalling, the ratio of one of the shell frequencies to the vortex-shedding frequency is an integer. Gradually, evidence began accumulating pointing to inconsistencies in the vortex-shedding hypothesis: (i) an integral relationship between the frequencies concerned may occur only at the onset of ovalling, but ovalling continues at higher wind speeds, when this integral relationship no longer holds; (ii) in fact, it was later shown that this integral relationship, although frequently present, certainly does not always occur, even at the onset of ovalling; (iii) ovalling also occurs when a long splitter plate in the wake suppresses periodic vortex shedding. With these facts established, the vortex-shedding hypothesis became untenable, and a new mechanism was proposed as the cause of ovalling: an aeroelastic flutter mechanism. In its original form, an analytical model (for shells with clamped ends) based on this new hypothesis achieved remarkable qualitative success; e.g., by predicting the correct modal orientation with respect to wind direction, and the sequence of the modes of oscillation as wind-speed is increased. In quantitative terms, however, agreement was rather poor. This model has subsequently been improved, as described in this paper, and quantitative agreement has improved very substantially. Recently obtained results (i) showing a large decrease in total damping (hence the existence of a negative aerodynamic damping) in the vicinity of the ovalling threshold, and (ii) an energy transfer analysis showing that, in the neighbourhood of the onset of ovalling, energy is gained by the shell from the flowing fluid, lend further support to the aeroelastic flutter hypothesis. It is concluded that ovalling is indeed an aeroelastic flutter phenomenon. The review is presented more or less chronologically, with the new results presented last, in abridged form, stressing throughout experimental and theoretical findings which have a bearing as to the mechanism underlying ovalling oscillation." @default.
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• W2067945667 date "1988-01-01" @default.
• W2067945667 modified "2023-09-23" @default.
• W2067945667 title "Ovalling oscillations of cylindrical shells in cross-flow: A review and some new results" @default.
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• W2067945667 doi "https://doi.org/10.1016/s0889-9746(88)90144-2" @default.
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