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.

Original 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

Keywords

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

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  • 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