Pure in-line (IL) vibrations will in many cases contribute significantly to fatigue damage for free spanning pipelines. This might be the case even if IL amplitudes are smaller than cross-flow (CF). While CF response has been subjected to research for a long time, little attention has so far been given to the pure IL VIV case. The hydrodynamic coefficients needed for response calculation have in fact not been available until recently, but results from forced IL oscillations have improved this situation. Data for added mass and force in IL direction has been used to establish a general response model along the same lines as for traditional CF response analysis. This has made it possible to calculate stresses from IL VIV in free spanning pipelines, and include the influence from interaction with the seafloor at the span shoulders. A brief presentation of the analysis method is given, but the main part of the paper gives results from a case study that illustrates important effects and the significance of IL response as compared to CF.
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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
ISBN:
0-7918-4269-X
PROCEEDINGS PAPER
Calculation of In-Line Vortex Induced Vibrations of Free Spanning Pipelines
Kristoffer Aronsen
Kristoffer Aronsen
Det Norske Veritas, Ho̸vik, Norway
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Carl M. Larsen
NTNU, Trondheim, Norway
Rune Yttervik
MARINTEK, Trondheim, Norway
Kristoffer Aronsen
Det Norske Veritas, Ho̸vik, Norway
Paper No:
OMAE2007-29533, pp. 957-964; 8 pages
Published Online:
May 20, 2009
Citation
Larsen, CM, Yttervik, R, & Aronsen, K. "Calculation of In-Line Vortex Induced Vibrations of Free Spanning Pipelines." Proceedings of the ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering. Volume 3: Pipeline and Riser Technology; CFD and VIV. San Diego, California, USA. June 10–15, 2007. pp. 957-964. ASME. https://doi.org/10.1115/OMAE2007-29533
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