Spars have become an “industry solution” for deepwater developments. Vortex-induced motion (VIM) of spar platforms in currents remains an important design concern. Although strakes are effective at suppressing riser VIM, all three straked classical spars in the Gulf of Mexico have experienced significant VIM events. These are not examples of poor design but indicate a lack of adequate tools for predicting spar VIM. This paper presents the development and validation of unsteady Reynolds-averaged Navier-Stokes (URANS) methods to predict real-world spar VIM behavior. It includes the ability to address rough surfaces and high supercritical Reynolds numbers. The resulting algorithms are used to assess the effectiveness of active and passive control strategies for suppressing spar VIM. Active control consists of injecting high-pressure water tangentially into the boundary layer and is shown to be extremely effective at reducing drag and VIM amplitudes. Passive control utilizes a sleeve to channel high-pressure stagnation flow into the boundary layer and is found less effective.
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e-mail: rkorpus@appliedfluidtech.com
e-mail: Stergios.Liapis@shell.com
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November 2007
Technical Papers
Active and Passive Control of Spar Vortex-Induced Motions
R. A. Korpus,
e-mail: rkorpus@appliedfluidtech.com
R. A. Korpus
Applied Fluid Technologies
, 326 First Street, Suite 34, Annapolis, MD 21043
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S. Liapis
e-mail: Stergios.Liapis@shell.com
S. Liapis
Shell International Exploration and Production Company
, 3737 Bellaire Blvd., Houston, TX 77025
Search for other works by this author on:
R. A. Korpus
Applied Fluid Technologies
, 326 First Street, Suite 34, Annapolis, MD 21043e-mail: rkorpus@appliedfluidtech.com
S. Liapis
Shell International Exploration and Production Company
, 3737 Bellaire Blvd., Houston, TX 77025e-mail: Stergios.Liapis@shell.com
J. Offshore Mech. Arct. Eng. Nov 2007, 129(4): 290-299 (10 pages)
Published Online: February 9, 2007
Article history
Received:
July 18, 2006
Revised:
February 9, 2007
Citation
Korpus, R. A., and Liapis, S. (February 9, 2007). "Active and Passive Control of Spar Vortex-Induced Motions." ASME. J. Offshore Mech. Arct. Eng. November 2007; 129(4): 290–299. https://doi.org/10.1115/1.2746400
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