Sensitivity study of wake oscillator parameters influencing the fatigue damage of a riser undergoing VIV

Ying Min Low, Narakorn Srinil

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

1 Citation (Scopus)

Abstract

A great deal of attention has recently been paid to the semiempirical modelling, nonlinear response prediction and estimation of stress and fatigue damage of marine risers undergoing vortex-induced vibrations (VIV). This is because when as the offshore industry move into deeper waters, the impact of VIV caused by ocean currents becomes detrimental being one of great concerns for offshore operators and riser engineers. For computational efficiency in time domain, the van der Pol wake oscillator, coupled with the structural equation of motion, has been an attractive approach. However, wake oscillator models rely on empirical coefficients, which have uncertainties whose effect on the fatigue reliability is not well understood. This study focusses on the wake oscillator proposed by Skop and Balasubramanian (1997). Using a toptensioned riser model, a sensitivity study is performed on several random variables to determine their influence on the uncertainty of the fatigue damage. These variables include the maximum vibration amplitude, frequency ratio, damping ratio and lift coefficient. In addition, Monte Carlo simulations are conducted to predict the probability of failure.

LanguageEnglish
Title of host publicationProceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE
Number of pages9
Volume3
DOIs
Publication statusPublished - 2015
EventASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2015 - St. John's, Canada
Duration: 31 May 20155 Jun 2015

Conference

ConferenceASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2015
CountryCanada
CitySt. John's
Period31/05/155/06/15

Fingerprint

Fatigue damage
Vortex flow
Marine risers
Ocean currents
Computational efficiency
Random variables
Vibrations (mechanical)
Equations of motion
Mathematical operators
Damping
Fatigue of materials
Engineers
Water
Industry
Uncertainty

Keywords

  • fatigue damage
  • marine riser
  • Monte Carlo simulation
  • uncertainty
  • vortex-induced vibration
  • wake oscillator

Cite this

Low, Y. M., & Srinil, N. (2015). Sensitivity study of wake oscillator parameters influencing the fatigue damage of a riser undergoing VIV. In Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE (Vol. 3). [OMAE2015-41034] https://doi.org/10.1115/OMAE2015-41034
Low, Ying Min ; Srinil, Narakorn. / Sensitivity study of wake oscillator parameters influencing the fatigue damage of a riser undergoing VIV. Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE. Vol. 3 2015.
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Low, YM & Srinil, N 2015, Sensitivity study of wake oscillator parameters influencing the fatigue damage of a riser undergoing VIV. in Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE. vol. 3, OMAE2015-41034, ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2015, St. John's, Canada, 31/05/15. https://doi.org/10.1115/OMAE2015-41034

Sensitivity study of wake oscillator parameters influencing the fatigue damage of a riser undergoing VIV. / Low, Ying Min; Srinil, Narakorn.

Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE. Vol. 3 2015. OMAE2015-41034.

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

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Low YM, Srinil N. Sensitivity study of wake oscillator parameters influencing the fatigue damage of a riser undergoing VIV. In Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE. Vol. 3. 2015. OMAE2015-41034 https://doi.org/10.1115/OMAE2015-41034