Offshore Code Comparison Collaboration, Continued, with Correlation


The Offshore Code Comparison, Collaboration, Continued, with Correlation (OC5) is an international research project run under the International Energy Agency (IEA) Wind Task 30. The project is focused on validating the tools used design offshore wind systems. OC5 consists of four phases:

• Phase Ia: analysis of a suspended cylinder in a wave basin

• Phase Ib: analysis of a fixed-bottom cylinder in a wave basin

• Phase II: analysis of a scaled wind turbine on a floating semisubmersible in an ocean basin

• Phase III: analysis of a full-scale wind turbine on a fixed-bottom structure in the open ocean

This website provides the data used for validation in these four phases, as well as simulation results from multiple participants.

Primary Contact(s)

Amy Robertson
National Renewable Energy Laboratory


The objectives of OC5 were to:

• Validate offshore wind modeling tools through the comparison of simulation results to measured data from a variety of experimental campaigns of varying structure types and conditions.

• Improve the physics of the offshore wind modeling tools based on both the outcomes of validation campaigns, and the technology innovations which require the expansion of the tools’ applicability and capabilities where limitations hinder technology advancement.

• Identify research and development needs beyond the scope of this project to better understand the physics of offshore wind systems and how to appropriately integrate these attributes into the modeling tools. This includes identifying the needs for future validation campaigns (i.e., need to better understand low-frequency nonlinear wave excitation) and significant improvements to the modeling tools (i.e., flexibility of the floating structure).


Starting: January 2014

Ending: December 2018


OC5 Project Phase II: Validation of Global Loads of the DeepCwind Floating Semisubmersible Wind Turbine (PDF)

OC5 Project Phase Ib: Validation of Hydrodynamic Loading on a Fixed, Flexible Cylinder for Offshore Wind Applications (PDF)




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