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Experimental investigation on VIV-galloping interaction of a rectangular 3:2 cylinder

  • Advances in Dynamics, Stability and Control of Mechanical Systems
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Abstract

The interaction between galloping and vortex-induced vibration was experimentally investigated for an infinitely long rectangular cylinder with a side ratio of 3:2, free to vibrate in the transverse mode in smooth flow. This geometry showed strong proclivity to instability and large oscillations occurred also at high Scruton numbers, in a range of flow speeds where no excitation was expected according to the classical theory. A high value of the ratio of the quasi-steady galloping critical wind speed to Kármán-vortex resonance velocity is necessary to avoid such a combined instability. Measurements of transverse displacements, velocity fluctuations in the wake of the oscillating body and pressures on its surface highlighted nonlinear features of the fluid-structure coupled system, such as superharmonic resonances and hysteresis. In particular, for low values of the Scruton number, non-negligible excitation was observed at low reduced wind speed due to secondary resonance.

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Acknowledgments

The authors wish to thank Dr. Davide Allori, Tommaso Massai and Luca Pigolotti for the help during the experimental campaign and Dr. Günter Schewe, from the German Aerospace Centre (DLR), Göttingen, Germany, for the advice in developing Set-up B.

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Authors and Affiliations

  1. Department of Civil and Environmental Engineering, CRIACIV, Via S. Marta 3, 50139,  Florence, Italy

    Claudio Mannini, Antonino M. Marra & Gianni Bartoli

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  1. Claudio Mannini
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  2. Antonino M. Marra
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  3. Gianni Bartoli
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Correspondence to Claudio Mannini.

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Mannini, C., Marra, A.M. & Bartoli, G. Experimental investigation on VIV-galloping interaction of a rectangular 3:2 cylinder. Meccanica 50, 841–853 (2015). https://doi.org/10.1007/s11012-014-0025-8

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  • DOI: https://doi.org/10.1007/s11012-014-0025-8

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