A common structural element encountered in semisubmersible designs is a rectangular vertical column with rounded corners. The time-averaged drag and oscillating lift and drag forces on such columns are strongly influenced by the location of the lines of flow separation on the column and hence the angle of attack of the incoming flow and the corner radius. In this paper we examine published wind tunnel data to illustrate these effects which include angle of attack and Reynolds number effects. This examination suggests that care must be exercised modeling flows around these elements. Also, the data suggest that Reynolds number effects and surface roughness effects may distort the results of scaled experiments. We use CFD simulations first to model the existing data and then to explore the possible changes in hydrodynamic properties due to Reynolds number and boundary layer effects. Recommendations are made regarding the physical and CFD modeling of the flow over these structures.
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ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering
June 17–22, 2018
Madrid, Spain
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-5121-0
PROCEEDINGS PAPER
Boundary Layer Effects in the Modeling of Semi-Submersible Columns
Samuel Holmes
Samuel Holmes
Red Wing Engineering, Inc., Palo Alto, CA
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Samuel Holmes
Red Wing Engineering, Inc., Palo Alto, CA
Paper No:
OMAE2018-78531, V002T08A012; 7 pages
Published Online:
September 25, 2018
Citation
Holmes, S. "Boundary Layer Effects in the Modeling of Semi-Submersible Columns." Proceedings of the ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. Volume 2: CFD and FSI. Madrid, Spain. June 17–22, 2018. V002T08A012. ASME. https://doi.org/10.1115/OMAE2018-78531
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