Aerodynamic Code-To-Code Comparison via IEA 22 MW Reference Turbine

Abstract Large turbines are already operational in fixed offshore wind, and it is anticipated that similar sizes will logically follow in the floating sector. Reference wind turbines play an important role in the global wind energy community, providing open access to realistic contemporary and futuristic designs. Reference models allow researchers to identify potential technological challenges associated with future turbine sizes, including an assessment of the supporting sub-structures, and mooring in the case of floating systems. Such models also facilitate an assessment of the suitability of currently available numerical modelling tools to accommodate future turbine sizes. This paper considers the IEA 22 MW reference wind turbine and performs a code-to-code comparison of simulation models built using the mid-fidelity aero-elastic tools OpenFAST, OrcaFlex and Flexcom. As the study is focused on the aeroelastic response, the turbine is fixed at its base, and no hydrodynamic effects are considered. Time invariant wind cases are firstly used to characterise turbine steady state response, before control is examined by an incrementally increasing stepped wind speed scenario. Finally, a realistic power production case is considered via fully time dependent turbulent wind. The codes show good agreement overall, notwithstanding some minor discrepancies in certain areas, and the results serve as a credible code-to-code validation of the tools considered. Findings from the study supplement prior research into the IEA 22 MW turbine and provide verification and validation information for research and industry applications. The simulation models are open access and freely available from the authors.