Vortex Induced Vibration on Lazy Waves Steel Catenary Risers

A Case Study of Deep-Offshore Nigeria

  • Franklin Okoro CLEANSCRIPT GROUP
  • Abisoye Abidakun

Abstract

This work was carried out on Deep – Offshore Nigeria JONSWAP based Steel Catenary Riser (SCR) design data of length of 3044m with buoyancy section of 600m clamped to an FPSO in water depth of 2000m. Also, appropriate meteocean data for Offshore Nigeria was used to simulate the environmental conditions. The entire process was statically and dynamically simulated using different wave spectra on Orcaflex software. The fatigue analysis results for the lazy-wave SCR with Vortex Induced Vibration (VIV) gave life and damage values as 15.4 years and 0.000177 respectively. While the fatigue life and damage results without VIV gave 17.99 years and 0.000152. At the buoyancy section, the Effective Tension (EF) for the VIV analysis at arc lengths 2000m, 2120m, 2240m, 2360m, 2480m and 2600m gave maxima values at 477KN; 418KN; 420KN; 477KN; 571KN and 685KN respectively. Similarly, results from the Non-VIV analysis for the arc lengths gave 440KN; 386KN; 390.8KN; 451KN; 547KN and 663.5KN respectively. The results show that VIV analysis led to a reduced fatigue life and higher damage value while buoyancy section gave higher tension when compared with Non-VIV. From the foregoing, this work shows that VIV plays a significant role in the overall fatigue of a lazy wave SCR in Deep Offshore Nigeria with great impact at the buoyancy section and hence should be properly taken into consideration in its design in Deep-Offshore Nigeria.

##Keywords:## Steel Catenary Riser, Deep-Offshore Nigeria, Vortex Induced Vibration, Orcaflex software.

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Published
Jun 28, 2026
How to Cite
OKORO, Franklin; ABIDAKUN, Abisoye. Vortex Induced Vibration on Lazy Waves Steel Catenary Risers. Journal of Subsea and Offshore -science and engineering-, [S.l.], v. 17, n. 1, p. 19-27, june 2026. ISSN 2442-6415. Available at: <https://isomase.org/Journals/index.php/jsose/article/view/142>. Date accessed: 15 july 2026.
Citation Formats
Issue
Vol 17 No 1 (2026): Journal of Subsea and Offshore -science and engineering- (JSOse)
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Articles

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