Renewable floating system design and optimisation

While many technologies already field-proven in the offshore O&G industry can be transferred to floating offshore renewable energy (ORE), it is crucial for large-scale developments to optimize the designs and use innovative technologies while controlling the risk. With tens of machines on a single farm and considering that substructure and foundation in a floating wind farm account for almost 40% of the CAPEX (NREL, 2021), there is a large cost reduction potential by improving sea-keeping behaviour of the floater, mooring lines and dynamic cable.

Our offer

  • Floating unit motion analysis
    • Seakeeping, free-floating analysis of floating units
  • Mooring design
    • Full range of mooring design and analysis for conceptual design, third-party verification for FEED and detailed design
    • Non-linear modelling of synthetic ropes, in particular nylon, combined with steel chains and wires
  • Coupled analysis with FOWT or substation, mooring and dynamic cable
    • FEA, hydrodynamic (1st and 2nd order) and aerodynamic coupled models
  • Basin model test and qualification
    • Specifications and tests follow-up
    • Modelling choices and adapted calibration

Our references

Several collaborative R&D projects on mooring line design and coupled analysis

  • POLYAMOOR and MONAMOOR R&D projects
    • Characterization of the dynamic and long-term behaviour of nylon mooring lines
    • Design and at sea deployment of a buoy dedicated to test nylon mooring lines in order to validate the non-linear and dynamic behaviour modelling of nylon mooring lines
  • MUTANC R&D project
    • Study the LCOE cost reduction potential from mutualised anchors
    • Mooring optimisation (chain, nylon, polyester, HMPE)
    • Post processing of multidirectional cyclic loading at shared anchors
    • 15 MW wind turbine (from IEA reference) + semi-submersible floater + mooring line (FEA) modelling
  • FLOWTOM R&D project
    • Multi body modelling (ship, wind turbine) of the floating offshore wind maintenance phase to assess heavy lift offshore maintenance methods

Our resources

  • A team with complementary and cross-disciplinary expertise: naval architecture, hydrodynamics, and mooring with extensive experience, in R&D and industrial projects from the O&G industry
  • Dedicated instrumentation
    • 4 buoys in the Atlantic Ocean and Mediterranean Sea, with wind and wave measurement, motion and tension monitoring of mooring line, biofouling observations
  • Digital tools
    • Radiation/diffraction software
    • OpenFAST, open source floating wind software
    • DeeplinesTM, SIMATM, commercial software for mooring, power cable, and marine operations
    • Dynamic cable modeller (in-house tool)
    • Generic floating ORE design tool, developed in-house during the DTOcean+ project
  • Specific know-how
    • Extensive knowledge of the behaviour of synthetic ropes specifically suited for floating ORE, in particular nylon ropes

Photo credit: Startup Stock Photos/Pixabay

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