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A Semi Submersible in Combined Extreme Waves and Current: Comparison of Model Tests and Existing Software

[+] Author Affiliations
Anne Katrine Bratland, Svein Ersdal

Aker Kværner Engineering and Technology, Lysaker, Norway

Sverre Haver

Statoil, Stavanger, Norway

Carl Trygve Stansberg

Marintek, Trondheim, Norway

Fuwei Zhang, Joachim Allers

Marintek (USA) Inc., Houston, TX

Jo̸rgen Krokstad

Det Norske Veritas, Ho̸vic, Norway

Paper No. OMAE2007-29652, pp. 757-766; 10 pages
  • ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering
  • Volume 1: Offshore Technology; Special Symposium on Ocean Measurements and Their Influence on Design
  • San Diego, California, USA, June 10–15, 2007
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 0-7918-4267-3 | eISBN: 0-7918-3799-8
  • Copyright © 2007 by ASME


Floating production systems are often exposed to combined waves and current. Normally, the effects from a steady current are neglected in the calculation methods for dynamic loads and motions. In some parts of the world the current velocities can be so large that neglecting wave-current interaction effects is questionable. Computer programs that handle wave-current interaction have been available for decades. However, so far very little results have been documented which validate the theories. Model test results for a semi submersible in extreme North Sea waves are presented, with and without current. The comparison with wave-current interaction computer models shows that the effect is generally over-estimated for the present case with a mean current velocity equal to 1.3 m/sec.

Copyright © 2007 by ASME



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