OSH PMC MEETING N°7 9 th June 2006, Athens (GR) OIL SEA HARVESTER TST4-CT Oil Sea Harvester Project OSH design : Hydrodynamics and Optimisation Partners involved : CAT Shipyard (FR) : Design BEC hydrodynamic laboratory (FR) : Numerical optimisation CEHIPAR hydrodynamic laboratory (SP) : Test campaigns

OSH PMC MEETING N°7 9 th June 2006, Athens (GR) OIL SEA HARVESTER TST4-CT General Objective : Optimisation of the operational performances of the OSH concept Transit phase –Powering performances : relatively high transit speed –Sea-keeping behaviour : low dynamic responses Oil recovery Phase –Sea-keeping behaviour for oil recovery operations up to sea state 6/7

OSH PMC MEETING N°7 9 th June 2006, Athens (GR) OIL SEA HARVESTER TST4-CT Transit phase : powering optimisation Objective : –Light displacement (8000 t) –Minimise the ship resistance at 25 knots –Minimise all hydrodynamic interactions at medium speeds Constraints : –Pods integration (immersion of the transom stern) – central cylindrical part of the main hull not modified –Lateral distance between the side hull and the main hull not modified (toll carriage and oil recovery tool integration) Design parameters : –Main hull –Side hull

OSH PMC MEETING N°7 9 th June 2006, Athens (GR) OIL SEA HARVESTER TST4-CT Powering optimisation : Main hull modifications Bow sections : thinner waterline Buttock line and transom immersion Bulbous bow Initial Final Optimal InitialFinal Initial Final Initial form

OSH PMC MEETING N°7 9 th June 2006, Athens (GR) OIL SEA HARVESTER TST4-CT Powering optimisation : Side hull modifications Best length : 101m (initial) Best longitudinal location : fore 80 m 101 m 138 m 120 m Main hull Side hull Initial side hull APFP Best compromise between bow wave interactions and stern wave interactions 19 knots25 knots Fore Aft

OSH PMC MEETING N°7 9 th June 2006, Athens (GR) OIL SEA HARVESTER TST4-CT Sea-keeping optimisation Objective : sea-keeping performances –Transit phase : V ≈20 knots -  = t Tool carriage in folded position –Oil recovery operations : V : low speed  = t Tool carriage deployed Constraints : –Pods integration –cylindrical part of the main hull not modified –distance between the side hull and the main hull not modified (tool carriage integration) Design parameters : –Side hull –Tool carriage

OSH PMC MEETING N°7 9 th June 2006, Athens (GR) OIL SEA HARVESTER TST4-CT Seakeeping optimisation for oil recovery operations (Transit phase not critical) Increase of the side hull diameter : 3.5m (instead of 3m) No influence of the longitudinal position of the side hulls Optimal length of the tool carriage : 11.5m Optimal location of the tool carriage : middle of the side hull Example of results : Influence of the length of the tool carriage on the oil recovery performances Operability diagram for 4 lengths : operability index (0-100%) versus wave heading

OSH PMC MEETING N°7 9 th June 2006, Athens (GR) OIL SEA HARVESTER TST4-CT Optimal design Thinner bow sections Maximum transom immersion (Bulbous bow) Side hulls of length 101m at extreme fore location Tool carriage of length 11.5m located in the middle of the side hull

OSH PMC MEETING N°7 9 th June 2006, Athens (GR) OIL SEA HARVESTER TST4-CT Tank tests in progress (task 5.3) - assessment of the design optimised numerically - calibration of the numerical tools (re-used for the final design stage) Resistance tests almost completed –Great importance of the static trim (transom immersion) –Optimal location of the side hull : fore Influence of the static trim Influence of the longitudinal Side hull location Seakeeping tests carried out from June to September 06

OSH PMC MEETING N°7 9 th June 2006, Athens (GR) OIL SEA HARVESTER TST4-CT Thank you for your attention

OSH PMC MEETING N°7 9 th June 2006, Athens (GR) OIL SEA HARVESTER TST4-CT Seakeeping optimisation Definition of the operability value Transit phase –Roll < 12° –Pitch < 4.5° –Vertical acceleration < 3m/s² Oil recovery operations –Wave elevation < 1m –Relative heave < 3m –Vertical acceleration < 3m/s² Maximum significant height Operability diagramm Statistiques du Golfe de Gascogne 71.8% Quantity of oil spilled (tonnes) : 50 to to >

OSH PMC MEETING N°7 9 th June 2006, Athens (GR) OIL SEA HARVESTER TST4-CT Seakeeping optimisation Transit phase Better performances than in oil recovery operations No need to optimise

OSH PMC MEETING N°7 9 th June 2006, Athens (GR) OIL SEA HARVESTER TST4-CT Seakeeping optimisation Oil recovery operations Increase of the side hull diameter :3.5m No influence of the longitudinal position of the side hulls Optimal length of the tool carriage : 11.5m Optimal location of the tool carriage : middle if the side hull Lngitudinal location of the side hullsLength of the tool carriage