VIV Fracture Investigation into 3D Marine Riser with a Circumferential Outside Surface Crack

Vortex-induced vibration (VIV) is one of the most common dynamic mechanisms that cause damage to marine risers. Hamilton’s variational principle is used to establish a vortex-induced vibration (VIV) model of a flexible riser in which the wake oscillator model is used to simulate cross-flow (CF) and...

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Autores principales:	Jun Liu, Zhigang Du, Xiaoqiang Guo, Liming Dai, Liang Huang, Xiao Li
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi Limited 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/dcb802cb55aa4c938f64feeffd7f565d
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spelling	oai:doaj.org-article:dcb802cb55aa4c938f64feeffd7f565d2021-11-22T01:10:31ZVIV Fracture Investigation into 3D Marine Riser with a Circumferential Outside Surface Crack1875-920310.1155/2021/2968325https://doaj.org/article/dcb802cb55aa4c938f64feeffd7f565d2021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/2968325https://doaj.org/toc/1875-9203Vortex-induced vibration (VIV) is one of the most common dynamic mechanisms that cause damage to marine risers. Hamilton’s variational principle is used to establish a vortex-induced vibration (VIV) model of a flexible riser in which the wake oscillator model is used to simulate cross-flow (CF) and inline flow (IL) vortex-induced forces and their coupling, taking into account the effect of the top tension and internal flow in the riser. The VIV model is solved by combining the Newmark-β and Runge–Kutta methods and verified with experimental data from the literature. Combining Option 1 and Option 2 failure assessment diagrams (FADs) in the BS7910 standard, a fracture failure assessment model for a marine riser with circumferential semielliptical outside surface cracks is established. Using the VIV model and FAD failure assessment chart, the effects of riser length, inside/outside flows, and top tension on the VIV response and safety assessment of marine risers with outside surface cracks are investigated. It is shown that increasing the top tension can inhibit the lateral displacement amplitude and bending stress in a riser, but excessive top tension can increase the axial stress in the riser, which counteracts the decrease in the bending stress, so that the effect of top tension on crack safety is not significant. The increasing outside flow velocity significantly increases the lateral vibration amplitude and bending stress in the riser and reduces the crack safety. When other parameters remain unchanged, increasing riser length has no significant effect on the vibration amplitude of the lower part of the riser.Jun LiuZhigang DuXiaoqiang GuoLiming DaiLiang HuangXiao LiHindawi LimitedarticlePhysicsQC1-999ENShock and Vibration, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Jun Liu Zhigang Du Xiaoqiang Guo Liming Dai Liang Huang Xiao Li VIV Fracture Investigation into 3D Marine Riser with a Circumferential Outside Surface Crack
description	Vortex-induced vibration (VIV) is one of the most common dynamic mechanisms that cause damage to marine risers. Hamilton’s variational principle is used to establish a vortex-induced vibration (VIV) model of a flexible riser in which the wake oscillator model is used to simulate cross-flow (CF) and inline flow (IL) vortex-induced forces and their coupling, taking into account the effect of the top tension and internal flow in the riser. The VIV model is solved by combining the Newmark-β and Runge–Kutta methods and verified with experimental data from the literature. Combining Option 1 and Option 2 failure assessment diagrams (FADs) in the BS7910 standard, a fracture failure assessment model for a marine riser with circumferential semielliptical outside surface cracks is established. Using the VIV model and FAD failure assessment chart, the effects of riser length, inside/outside flows, and top tension on the VIV response and safety assessment of marine risers with outside surface cracks are investigated. It is shown that increasing the top tension can inhibit the lateral displacement amplitude and bending stress in a riser, but excessive top tension can increase the axial stress in the riser, which counteracts the decrease in the bending stress, so that the effect of top tension on crack safety is not significant. The increasing outside flow velocity significantly increases the lateral vibration amplitude and bending stress in the riser and reduces the crack safety. When other parameters remain unchanged, increasing riser length has no significant effect on the vibration amplitude of the lower part of the riser.
format	article
author	Jun Liu Zhigang Du Xiaoqiang Guo Liming Dai Liang Huang Xiao Li
author_facet	Jun Liu Zhigang Du Xiaoqiang Guo Liming Dai Liang Huang Xiao Li
author_sort	Jun Liu
title	VIV Fracture Investigation into 3D Marine Riser with a Circumferential Outside Surface Crack
title_short	VIV Fracture Investigation into 3D Marine Riser with a Circumferential Outside Surface Crack
title_full	VIV Fracture Investigation into 3D Marine Riser with a Circumferential Outside Surface Crack
title_fullStr	VIV Fracture Investigation into 3D Marine Riser with a Circumferential Outside Surface Crack
title_full_unstemmed	VIV Fracture Investigation into 3D Marine Riser with a Circumferential Outside Surface Crack
title_sort	viv fracture investigation into 3d marine riser with a circumferential outside surface crack
publisher	Hindawi Limited
publishDate	2021
url	https://doaj.org/article/dcb802cb55aa4c938f64feeffd7f565d
work_keys_str_mv	AT junliu vivfractureinvestigationinto3dmarineriserwithacircumferentialoutsidesurfacecrack AT zhigangdu vivfractureinvestigationinto3dmarineriserwithacircumferentialoutsidesurfacecrack AT xiaoqiangguo vivfractureinvestigationinto3dmarineriserwithacircumferentialoutsidesurfacecrack AT limingdai vivfractureinvestigationinto3dmarineriserwithacircumferentialoutsidesurfacecrack AT lianghuang vivfractureinvestigationinto3dmarineriserwithacircumferentialoutsidesurfacecrack AT xiaoli vivfractureinvestigationinto3dmarineriserwithacircumferentialoutsidesurfacecrack
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VIV Fracture Investigation into 3D Marine Riser with a Circumferential Outside Surface Crack

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