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.
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 language | English |
|---|---|
| Title of host publication | Proceedings of the ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering (OMAE2009) |
| Subtitle of host publication | Polar and Arctic Sciences and Technology; CFD and VIV |
| Pages | 285-291 |
| Number of pages | 7 |
| Volume | 5 |
| DOIs | |
| Publication status | Published - Jun 2009 |
| Event | 28th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2009 - Hawaii, USA Duration: 31 May 2009 → 5 Jun 2009 |
Conference
| Conference | 28th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2009 |
|---|---|
| City | Hawaii, USA |
| Period | 31/05/09 → 5/06/09 |
Keywords
- preliminary
- instability-analysis
- deepwater
- riser
- fairings