IEA Wind Task 30 Offshore Code Comparison Collaboration Continued

interest in continuing the work of OC3. The purpose of the project was to perform a benchmarking exercise of offshore wind turbine dynamics codes. OC4 consisted of two phases that were not considered in OC3: (1) analysis of a wind turbine on an offshore fixed-bottom jacket and (2) analysis of a wind turbine on an offshore floating semi-submersible. Additionally, an experts meeting on the topic of test methods, data availability, and code validation was held as a stand-alone meeting. OC4 was led cooperatively by the National Renewable Energy Laboratory (NREL) and the Fraunhofer Institute for Wind Energy and Energy Systems Technology IWES. NREL was responsible for project management, coordination with the ExCo, project finances, and organization of the topical experts meeting. Fraunhofer IWES was responsible for the technical coordination and reporting of Phase I, while NREL was responsible for the technical coordination and reporting of Phase II. IEA Wind Task 30 lasted for three years. Each phase lasted about two years, with one year of overlap in the middle, beginning with Phase I in the first year. The topical experts meeting was held in the second year. A report summarizing the results was published at the conclusion of each phase, as well as on the results of the topical experts meeting. This report, as well as a technical summary report, are the final reports for the project