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.
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ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering
June 10–15, 2007
San Diego, California, USA
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
Volume 1: Offshore Technology; Special Symposium on Ocean Measurements and Their Influence on Design
ISBN:
0-7918-4267-3
PROCEEDINGS PAPER
A Semi Submersible in Combined Extreme Waves and Current: Comparison of Model Tests and Existing Software
Anne Katrine Bratland,
Anne Katrine Bratland
Aker Kværner Engineering and Technology, Lysaker, Norway
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Carl Trygve Stansberg,
Carl Trygve Stansberg
Marintek, Trondheim, Norway
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Joachim Allers,
Joachim Allers
Marintek (USA) Inc., Houston, TX
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Jo̸rgen Krokstad,
Jo̸rgen Krokstad
Det Norske Veritas, Ho̸vic, Norway
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Svein Ersdal
Svein Ersdal
Aker Kværner Engineering and Technology, Lysaker, Norway
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Anne Katrine Bratland
Aker Kværner Engineering and Technology, Lysaker, Norway
Sverre Haver
Statoil, Stavanger, Norway
Carl Trygve Stansberg
Marintek, Trondheim, Norway
Fuwei Zhang
Marintek (USA) Inc., Houston, TX
Joachim Allers
Marintek (USA) Inc., Houston, TX
Jo̸rgen Krokstad
Det Norske Veritas, Ho̸vic, Norway
Svein Ersdal
Aker Kværner Engineering and Technology, Lysaker, Norway
Paper No:
OMAE2007-29652, pp. 757-766; 10 pages
Published Online:
May 20, 2009
Citation
Bratland, AK, Haver, S, Stansberg, CT, Zhang, F, Allers, J, Krokstad, J, & Ersdal, S. "A Semi Submersible in Combined Extreme Waves and Current: Comparison of Model Tests and Existing Software." Proceedings of the 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. pp. 757-766. ASME. https://doi.org/10.1115/OMAE2007-29652
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