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Characteristics of VIV in multi-degree-of-freedom tensioned beams using a numerical method

Authors
Jung, D.Kim, H.Shin, S.
Issue Date
2012
Publisher
Springer Tokyo
Keywords
Eigenvalue; FDM; Inline instability; Numerical study; Phase angle; Tensioned beam; VIV
Citation
Journal of Marine Science and Technology (Japan), v.17, no.3, pp 349 - 359
Pages
11
Journal Title
Journal of Marine Science and Technology (Japan)
Volume
17
Number
3
Start Page
349
End Page
359
URI
https://www.kriso.re.kr/sciwatch/handle/2021.sw.kriso/1042
DOI
10.1007/s00773-012-0166-1
ISSN
0948-4280
1437-8213
Abstract
The object of this study is to analyze the characteristics of vortex-induced vibration of a slender marine structure with the numerical method. Applying a dynamic analysis method for a slender marine structure based on the 3D finite difference method, we carried out case studies for a tensioned beam model at a constant flow speed. The hydrodynamic forces, in the direction of inline and cross-flow, created by vortex shedding are simultaneously considered based on Morison equation. The frequency of force in the inline direction corresponding to the unstable zone is evaluated. An eigenvalue analysis for different flow speeds of a tensioned beam considering the effect of the tension increase due to the inline and cross-flow drag forces is performed. We found that a revision of the eigenvalue should be considered if the tension along a riser or beam is significantly affected by an environmental or functional load. From a trajectory on the XY plane it was shown that the riser did not move in an exact 8 shape for all flow conditions due to the phase angle difference between inline and cross-flow displacement. It is believed that the phase angles between inline and cross-flow displacements in high modes are different among the nodes. ? JASNAOE 2012.
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