Geometric Constraints and Stability Thresholds in Column-Integrated OWC-FOWT Hybrid Floaters
DOI:
https://doi.org/10.17979/ja-cea.2026.47.13782Keywords:
Floating offshore wind turbine, Oscillating water column, Semisubmersible Platform, Passive motion reduction, Hydrostatic stability, Wave–structure interaction, Geometric constraints, Numerical modelingAbstract
Large platform motions remain a key barrier to expanding floating offshore wind turbines (FOWTs) into deep-water environments,
reducing energy yield and accelerating structural fatigue. This brief investigates the numerical design and passive
performance bounds of a novel hybrid semisubmersible platform derived from the 12MWINO WINDMOOR concept, modified
to incorporate Oscillating Water Column (OWC) chambers inside its main columns. The system is evaluated strictly under a
passive framework, isolating the geometric impact of open water-column spaces on hydrostatic restoration and wave-frequency
dynamics. The results uncover an intricate geometric trade-off: internal configurations significantly improve pitch natural period
characteristics but risk catastrophic compliance failure under Norwegian Maritime Authority (NMA) standards when chamber
scaling displaces critical internal ballast reserves.
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