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Details of Grant 

EPSRC Reference: GR/L69879/01
Title: VIOLENT WATER SURFACE BEHAVIOUR AROUND LARGE VERTICAL CYLINDERS IN LARGE WAVES
Principal Investigator: Chaplin, Professor JR
Other Investigators:
Researcher Co-Investigators:
Project Partners:
Atkins
Department: Unknown
Organisation: City, University of London
Scheme: Standard Research (Pre-FEC)
Starts: 01 January 1998 Ends: 30 September 1999 Value (£): 62,625
EPSRC Research Topic Classifications:
Coastal & Waterway Engineering Oil & Gas Extraction
EPSRC Industrial Sector Classifications:
Energy
Related Grants:
Panel History:  
Summary on Grant Application Form
The violent motion of the water surface-piercing cylinder at the crest of a large wave is a contributory factor in the offshore oil industry's recent experiences of the ringing of platforms and green water deck impacts. The subject is particularly topical because of the new tanker-based floating production systems (FPSOs) being built for the North Sea, which feature a potentially vulnerable cylindrical turret in the bow. The hydrodynamics are complex and highly non-linear; reliable data from laboratory experiments are required to validate numerical models. It is proposed to expose a model cylinder to extreme waves produced by frequency focussing: measurements will be made of the pressure distribution around the cyclinder, and the water surface elevation over an area surrounding the cylinder. The equivalent measurements will be made for a cylinder driven with predetermined dynamics through still water, allowing the surface interaction to be determined independantly of the extreme wave kinematics. The work proposed will assemble for the first time a large body of high-quality data, checked against industry-standard code provided by the project's industrial partner. The likely benefits will be improvements to the design used by the research and industrial communities concerned with the safe and confident development of offshore resources in increasingly deep water and hostile conditions.
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Further Information:  
Organisation Website: http://www.city.ac.uk