Journal
SHIPS AND OFFSHORE STRUCTURES
Volume 17, Issue 5, Pages 1142-1158Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/17445302.2021.1897220
Keywords
Flow induced vibration; rigidly connected cylinders; angle of incidence; coalescing action; dissipation
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Funding
- National Science Foundation of China [51609206]
- Open Fund Project of the State Key Laboratory of Coastal and Offshore Engineering in Dalian University of Technology [LP2002]
- PetroChina Southwest Oil and Gasfield Company Postdoctoral Program [20200302-07]
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The numerical study investigates the flow induced vibration responses of two rigidly connected cylinders at different staggered configurations. The results show that the wake interference between the cylinders weakens as the angle of incidence increases, leading to a decreasing trend in maximum vibration amplitude and total mean drag coefficient.
The flow induced vibration (FIV) responses of two rigidly connected cylinders at different staggered configurations have been studied numerically. The two cylinders, with an equal diameter of D, can oscillate in both cross-flow (CF) and in-line (IL) directions simultaneously. The center-to-center spacing between the two cylinders has been fixed at 4D. The numerical results demonstrate that as the angle of incidence (alpha) increases, the wake interference between the two cylinders becomes weak. For alpha with small values, the FIV responses are dominated by the galloping vibration and the vortex-induced vibration (VIV) simultaneously. However, for alpha with large values, the FIV responses are obviously dominated by the VIV. As alpha increases, the maximum vibration amplitude follows a downward trend and the total mean drag coefficient tends to decrease. Furthermore, the vortex shedding flow pattern has apparently different modes for varying alpha.
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