Abstract
The static solution and its associated dynamic stability of a vertical riser situated in the wake of an upstream riser is investigated in this paper. Both the upstream and downstream risers are top tensioned and pinned at the bottom ends on the seabed. Due to the wake effect, the downstream riser is subject to lift force as well as drag along its length. It is shown that under certain current conditions there exist multiple stable and unstable static solutions of the downstream riser. There also exists a critical current velocity and once this velocity is exceeded no static solutions of the downstream riser can be found. The disappearance of static solutions is closely related to the loss of stability which is likely to cause clashing between the two risers. The critical current velocity is best described by a non-dimensional parameter involving both the mass parameter and the reduced velocity.
| Original language | English |
|---|---|
| Title of host publication | The Proceedings of The Twelfth (2002) International Offshore and Polar Engineering Conference |
| Editors | Jin S. Chung, Mohamed Sayed, Masashi Kashiwagi, Toshiaki Setoguchi, Seok Won Hong |
| Place of Publication | California, USA |
| Publisher | International Society of Offshore and Polar Engineers |
| Pages | 171-178 |
| Number of pages | 8 |
| ISBN (Print) | 1880653583 |
| Publication status | Published - 1 Dec 2002 |
| Event | The Twelfth (2002) International Offshore and Polar Engineering Conference - Kitakyushu, Japan Duration: 26 May 2002 → 31 May 2002 |
Conference
| Conference | The Twelfth (2002) International Offshore and Polar Engineering Conference |
|---|---|
| Country/Territory | Japan |
| City | Kitakyushu |
| Period | 26/05/02 → 31/05/02 |
Keywords
- collision
- equilibrium
- marine riser
- statics