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SUMMARY:THE DRILLERS DON’T LIKE GETTING WET or WHY THE LAUNDRY ROOM KEEP
 S GETTING FLOODED : Water up to surprisingly high levels around the legs o
 f large floating oil rigs - Professor Paul H. Taylor\, Department of Engin
 eering Science\, University of Oxford
DTSTART:20141121T130000Z
DTEND:20141121T140000Z
UID:TALK53587@talks.cam.ac.uk
CONTACT:Aleksandra Przydrozna
DESCRIPTION:`There are many floating (and fixed) oil platforms that have t
 hree or more large diameter legs close together\, and many accounts of min
 or damage to equipment and secondary steelwork caused by ‘green’ water
  reaching much higher levels than anticipated even in relatively modest st
 orms.\n \nI shall make a link between the theoretical description of 'near
 -trapped modes' - close to standing wave patterns between the legs - and t
 he practical issues highlighted above\, taking as an example a simplified 
 model of a large production semi-submersible rig with four closely spaced 
 legs connected by submerged pontoons. The geometry is typical of floating 
 rigs installed in the Gulf of Mexico\, the North Sea and elsewhere.\n \nTh
 ree main observations are clear :\n# Significant near trapping is predicte
 d to occur below the deck of a realistic 4-leg rig in random waves\, with 
 water predicted to reach >2x the levels away from the rig.\n# This near-tr
 apping can occur due to linear and nonlinear second order effects\, but fo
 r realistic large structures in severe storms the frequency-doubling secon
 d order effects can be very large.\n# Whether the rig is restrained vertic
 ally (a TLP) or freely floating (a semi-sub)\, so it can ride the waves\, 
 has a dramatic effect on the risk of water reaching the main deck level\, 
 even with the same hull geometry.' \n
LOCATION:LR3B\, Inglis Building\, CUED.
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