The effect of vortices structures on the flow-induced vibration of three flexible tandem cylinders

•The effect of different vortex structures on FIV of tandem cylinders is investigated.•The periodic oscillating vortices from upstream can magnify the FIV of downstream cylinders more intensely than the steady vortices.•The irregular small-scale vortices can drastically increase the FIV of tandem cy...

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Veröffentlicht in:International journal of mechanical sciences 2021-02, Vol.192, p.106132, Article 106132
Hauptverfasser: Fan, Xiantao, Wang, Zhongchen, Wang, Yang, Tan, Wei
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Sprache:eng
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Zusammenfassung:•The effect of different vortex structures on FIV of tandem cylinders is investigated.•The periodic oscillating vortices from upstream can magnify the FIV of downstream cylinders more intensely than the steady vortices.•The irregular small-scale vortices can drastically increase the FIV of tandem cylinders leading to the second instability of tandem cylinders at Ur≥20. Flow-induced vibration (FIV) is a phenomenon oftentimes occurring in practical situations where flexible cylinders are immersed in an oncoming flow. Understanding the FIV characteristics in different vortex structures plays an important role in vibration control and utilization of engineering structures, such as offshore stacks and bladeless wind turbines. A detailed investigation on FIV of flexible tandem cylinders in the atmospheric boundary layer (ABL) under various vortex structures through setting strakes were conducted experimentally and numerically. The typical FIV responses and dynamic vortex evolutions at two specific spans, 1.4 and 3.2, were obtained in Ur∈[2, 35] to demonstrate the effect of different vortices. At the small span, FIV of tandem cylinders depends on the shear layers interaction, which behave as a uncircular bluff body with a pivot point near the downstream cylinder. Under the irregular small-scale vortices generated by the disturbed shear layer, the second instability of FIV of tandem cylinders at Ur≥20 can be excited. At the moderate span, the fully developed wake interference predominates. Among the effect of three different vortex structures, FIV of tandem cylinders cannot be promoted by steady vortices; clear FIV responses at Ur
ISSN:0020-7403
1879-2162
DOI:10.1016/j.ijmecsci.2020.106132