A Qualified, Traceable and Reproducible FAIR OpenFAST Dataset for the NREL 5-MW/OC4-DeepCwind Floating Wind Turbine Benchmark

This dataset provides time-domain OpenFAST simulation results for the NREL 5-MW reference wind turbine mounted on the OC4-DeepCwind semisubmersible floating platform, organized as 123 sea-state conditions (significant wave height Hs × peak period Tp, Tp discretized at native campaign resolution: 16 values, 2–17 s in 1 s increments) combined with multiple wind speeds per sea state, yielding 614 individual simulation realizations. Unlike a raw simulation dump, every realization in this release has passed explicit, orthogonal admissibility checks — numerical-integrity (simulation duration, seed consistency) and physical-domain qualification (breaking-limit ratio Rb) — evaluated independently of any downstream modelling use. The current qualified domain comprises 89 Class A (fully admissible) and 6 Class B groups, with a fully logged, traceable exclusion and expert-override record for every group not admitted — not merely a pass/fail flag. Each entity (sea-state Group, wind-speed Realization) carries a persistent identifier and a complete provenance chain from raw simulation input through qualification outcome to repository record, enabling independent verification and reproduction. Released under CC-BY 4.0. Methodology, qualification criteria, and technical validation are described in the companion Data Descriptor publication. [DOI 10.5281/zenodo.21822607].