Experimental study of vortex-induced vibration of a twin-tube submerged floating tunnel segment model

The cross-flow vortex-induced vibration features of a submerged floating tunnel element, which is composed of two rigidly connected cylinders in a tandem configuration, were investigated via a self-oscillation model test in a steady flow. The Reynolds number ranged from 2×104 to 9×104, and the ratio...

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Bibliographic Details
Published in:Journal of fluids and structures 2020-04, Vol.94, p.102908, Article 102908
Main Authors: Deng, Shi, Ren, Haojie, Xu, Yuwang, Fu, Shixiao, Moan, Torgeir, Gao, Zhen
Format: Article
Language:English
Subjects:
Lift force
Response amplitude
Submerged floating tunnel
Torsional moment
Vortex-induced vibration
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Summary:The cross-flow vortex-induced vibration features of a submerged floating tunnel element, which is composed of two rigidly connected cylinders in a tandem configuration, were investigated via a self-oscillation model test in a steady flow. The Reynolds number ranged from 2×104 to 9×104, and the ratio of the center-to-center distance between the two cylinders and cylinder diameter varied within a range of 2-4. The vortex induced vibration responses and lift forces on the up- and downstream cylinders were studied under different spacing ratios and compared with those on a single cylinder. The results show that the spacing ratio plays an important role in VIV until the ratio reaches 4. For a small spacing ratio, a significant difference between the lift forces on the up- and downstream cylinders appears and induces a large torsional moment. For the convenience of engineering application, a torsional coefficient was proposed. The maximum torsional coefficient can reach 2.9, 1.2 and 0.98 for spacing ratios of 2, 3 and 4 at the reduced velocity of 5, respectively. Considering the vortex induced vibration responses as well as the torsional moment, a spacing ratio of 3 was recommended for tandem floating tunnel design. •Self-oscillation test of a twin-tube submerged floating tunnel segment model.•Lift forces on stationary and self-oscillation twin-cylinder are compared.•A torsional moment is induced due to the difference of lift force on the cylinders.•Spacing ratio heavily affects the vortex induced response, lift and torsion.
ISSN:0889-9746
1095-8622
DOI:10.1016/j.jfluidstructs.2020.102908