A parametric study on fatigue of a top-tensioned riser subjected to vortex-induced vibrations

This study aims to provide useful information on the fatigue assessment of a top-tensioned riser (TTR) subjected to vortex-induced vibration (VIV) by performing parametric study. The effects of principal design parameters, i.e., riser diameter, wall thickness, water depth (related to riser length),...

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Main Authors: Kim, D.K., Wong, E.W.C., Lekkala, M.K.R.
Format: Article
Institution: Universiti Teknologi Petronas
Record Id / ISBN-0: utp-eprints.24833 /
Published: Techno Press 2019
Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85081609305&doi=10.12989%2fsmm.2019.6.4.365&partnerID=40&md5=8218356182b90bf5c0a3842039104b4b
http://eprints.utp.edu.my/24833/
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spelling utp-eprints.248332021-08-27T08:35:31Z A parametric study on fatigue of a top-tensioned riser subjected to vortex-induced vibrations Kim, D.K. Wong, E.W.C. Lekkala, M.K.R. This study aims to provide useful information on the fatigue assessment of a top-tensioned riser (TTR) subjected to vortex-induced vibration (VIV) by performing parametric study. The effects of principal design parameters, i.e., riser diameter, wall thickness, water depth (related to riser length), top tension, current velocity, and shear rate (or shear profile of current) are investigated. To prepare the base model of TTR for parametric studies, three (3) riser modelling techniques in the OrcaFlex were investigated and validated against a reference model by Knardahl (2012). The selected riser model was used to perform parametric studies to investigate the effects of design parameters on the VIV fatigue damage of TTR. From the obtained comparison results of VIV analysis, it was demonstrated that a model with a single line model ending at the lower flex joint (LFJ) and pinned connection with finite rotation stiffness to simulate the LFJ properties at the bottom end of the line model produced acceptable prediction. Moreover, it was suitable for VIV analysis purposes. Findings from parametric studies showed that VIV fatigue damage increased with increasing current velocity, riser outer diameter and water depth, and decreased with increasing shear rate and top tension of riser. With regard to the effects of wall thickness, it was not significant to VIV fatigue damage of TTR. The detailed outcomes were documented with parametric study results. © 2019 Techno-Press, Ltd. Techno Press 2019 Article NonPeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-85081609305&doi=10.12989%2fsmm.2019.6.4.365&partnerID=40&md5=8218356182b90bf5c0a3842039104b4b Kim, D.K. and Wong, E.W.C. and Lekkala, M.K.R. (2019) A parametric study on fatigue of a top-tensioned riser subjected to vortex-induced vibrations. Structural Monitoring and Maintenance, 6 (4). pp. 365-387. http://eprints.utp.edu.my/24833/
institution Universiti Teknologi Petronas
collection UTP Institutional Repository
description This study aims to provide useful information on the fatigue assessment of a top-tensioned riser (TTR) subjected to vortex-induced vibration (VIV) by performing parametric study. The effects of principal design parameters, i.e., riser diameter, wall thickness, water depth (related to riser length), top tension, current velocity, and shear rate (or shear profile of current) are investigated. To prepare the base model of TTR for parametric studies, three (3) riser modelling techniques in the OrcaFlex were investigated and validated against a reference model by Knardahl (2012). The selected riser model was used to perform parametric studies to investigate the effects of design parameters on the VIV fatigue damage of TTR. From the obtained comparison results of VIV analysis, it was demonstrated that a model with a single line model ending at the lower flex joint (LFJ) and pinned connection with finite rotation stiffness to simulate the LFJ properties at the bottom end of the line model produced acceptable prediction. Moreover, it was suitable for VIV analysis purposes. Findings from parametric studies showed that VIV fatigue damage increased with increasing current velocity, riser outer diameter and water depth, and decreased with increasing shear rate and top tension of riser. With regard to the effects of wall thickness, it was not significant to VIV fatigue damage of TTR. The detailed outcomes were documented with parametric study results. © 2019 Techno-Press, Ltd.
format Article
author Kim, D.K.
Wong, E.W.C.
Lekkala, M.K.R.
spellingShingle Kim, D.K.
Wong, E.W.C.
Lekkala, M.K.R.
A parametric study on fatigue of a top-tensioned riser subjected to vortex-induced vibrations
author_sort Kim, D.K.
title A parametric study on fatigue of a top-tensioned riser subjected to vortex-induced vibrations
title_short A parametric study on fatigue of a top-tensioned riser subjected to vortex-induced vibrations
title_full A parametric study on fatigue of a top-tensioned riser subjected to vortex-induced vibrations
title_fullStr A parametric study on fatigue of a top-tensioned riser subjected to vortex-induced vibrations
title_full_unstemmed A parametric study on fatigue of a top-tensioned riser subjected to vortex-induced vibrations
title_sort parametric study on fatigue of a top-tensioned riser subjected to vortex-induced vibrations
publisher Techno Press
publishDate 2019
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-85081609305&doi=10.12989%2fsmm.2019.6.4.365&partnerID=40&md5=8218356182b90bf5c0a3842039104b4b
http://eprints.utp.edu.my/24833/
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score 11.62408

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