Preliminary instability-analysis of deepwater riser with fairings

Mahdi Khorasanchi, Shan Huang

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

3 Citations (Scopus)
117 Downloads (Pure)

Abstract

Instability of deepwater riser with fairings is investigated in this study. Despite the advantages over other devices for suppressing vortex-induced-vibration (VIV), fairings may be susceptible to flutter type instability. A two-body mathematical model is established for the coupled transverse-torsion motion
of a top tensioned riser with fairings. The inner part (riser) can only move transversely while the outer part (fairing) has transverse-torsion motion. The effect of the transverse velocity on the angle of attack is taken into account and damping is considered for both degrees of freedom. An eigenvalue analysis
is employed to examine the issue of stability. The emphasis is on identifying the critical current speed for a given riser and fairing configuration. The effects of key parameters are investigated and the results indicate that the section
hydrodynamic characteristics of the fairings have a significant impact on the instability.
Original languageEnglish
Title of host publicationProceedings of the ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering (OMAE2009)
Subtitle of host publicationPolar and Arctic Sciences and Technology; CFD and VIV
Pages285-291
Number of pages7
Volume5
DOIs
Publication statusPublished - Jun 2009
Event28th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2009 - Hawaii, USA
Duration: 31 May 20095 Jun 2009

Conference

Conference28th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2009
CityHawaii, USA
Period31/05/095/06/09

Keywords

  • preliminary
  • instability-analysis
  • deepwater
  • riser
  • fairings

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