Multiple static solutions and stability of a vertical riser in the wake of an upstream vertical riser

Wusheng Wu, Shan Huang, Nigel Barltrop

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

4 Citations (Scopus)

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 languageEnglish
Title of host publicationThe Proceedings of The Twelfth (2002) International Offshore and Polar Engineering Conference
EditorsJin S. Chung, Mohamed Sayed, Masashi Kashiwagi, Toshiaki Setoguchi, Seok Won Hong
Place of PublicationCalifornia, USA
PublisherInternational Society of Offshore and Polar Engineers
Pages171-178
Number of pages8
ISBN (Print)1880653583
Publication statusPublished - 1 Dec 2002
EventThe Twelfth (2002) International Offshore and Polar Engineering Conference - Kitakyushu, Japan
Duration: 26 May 200231 May 2002

Conference

ConferenceThe Twelfth (2002) International Offshore and Polar Engineering Conference
CountryJapan
CityKitakyushu
Period26/05/0231/05/02

Keywords

  • collision
  • equilibrium
  • marine riser
  • statics

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