OC6 project phase III : validation of the aerodynamic loading on a wind turbine rotor undergoing large motion caused by a floating support structure

Bergua, Roger and Robertson, Amy and Jonkman, Jason and Branlard, Emmanuel and Fontanella, Alessandro and Belloli, Marco and Schito, Paolo and Zasso, Alberto and Persico, Giacomo and Sanvito, Andrea and Amet, Ervin and Brun, Cédric and Campaña-Alonso, Guillén and Martín-San-Román, Raquel and Cai, Ruolin and Cai, Jifeng and Qian, Quan and Maoshi, Wen and Beardsell, Alec and Pirrung, Georg and Ramos-García, Néstor and Shi, Wei and Fu, Jie and Corniglion, Rémi and Lovera, Anaïs and Galván, Josean and Nygaard, Tor Anders and dos Santos, Carlos Renan and Gilbert, Philippe and Joulin, Pierre-Antoine and Blondel, Frédéric and Frickel, Eelco and Chen, Peng and Hu, Zhiqiang and Boisard, Ronan and Yilmazlar, Kutay and Croce, Alessandro and Harnois, Violette and Zhang, Lijun and Li, Ye and Aristondo, Ander and Alonso, Iñigo Mendikoa and Mancini, Simone and Boorsma, Koen and Savenije, Feike and Marten, David and Soto-Valle, Rodrigo and Schulz, Christian and Netzband, Stefan and Bianchini, Alessandro and Papi, Francesco and Cioni, Stefano and Trubat, Pau and Alarcon, Daniel and Molins, Climent and Cormier, Marion and Brüker, Konstantin and Lutz, Thorsten and Xiao, Qing and Deng, Zhongsheng and Haudin, Florence and Goveas, Akhilesh (2023) OC6 project phase III : validation of the aerodynamic loading on a wind turbine rotor undergoing large motion caused by a floating support structure. Wind Energy Science, 8 (4). 465–485. ISSN 2366-7451 (https://doi.org/10.5194/wes-2022-74)

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This paper provides a summary of the work done within Phase III of the Offshore Code Comparison Collaboration, Continued, with Correlation and unCertainty (OC6) project, under the International Energy Agency Wind Technology Collaboration Programme Task 30. This phase focused on validating the aerodynamic loading on a wind turbine rotor undergoing large motion caused by a floating support structure. Numerical models of the Technical University of Denmark 10 MW reference wind turbine were validated using measurement data from a 1:75 scale test performed during the UNsteady Aerodynamics for FLOating Wind (UNAFLOW) project and a follow-on experimental campaign, both performed at the Politecnico di Milano wind tunnel. Validation of the models was performed by comparing the loads for steady (fixed platform) and unsteady (harmonic motion of the platform) wind conditions. For the unsteady wind conditions, the platform was forced to oscillate in the surge and pitch directions under several frequencies and amplitudes. These oscillations result in a wind variation that impacts the rotor loads (e.g., thrust and torque). For the conditions studied in these tests, the system aerodynamic response was almost steady. Only a small hysteresis in airfoil performance undergoing angle of attack variations in attached flow was observed. During the experiments, the rotor speed and blade pitch angle were held constant. However, in real wind turbine operating conditions, the surge and pitch variations would result in rotor speed variations and/or blade pitch actuations, depending on the wind turbine controller region that the system is operating. Additional simulations with these control parameters were conducted to verify the fidelity of different models. Participant results showed, in general, a good agreement with the experimental measurements and the need to account for dynamic inflow when there are changes in the flow conditions due to the rotor speed variations or blade pitch actuations in response to surge and pitch motion. Numerical models not accounting for dynamic inflow effects predicted rotor loads that were 9% lower in amplitude during rotor speed variations and 18% higher in amplitude during blade pitch actuations.


Bergua, Roger, Robertson, Amy, Jonkman, Jason, Branlard, Emmanuel, Fontanella, Alessandro, Belloli, Marco, Schito, Paolo, Zasso, Alberto, Persico, Giacomo, Sanvito, Andrea, Amet, Ervin, Brun, Cédric, Campaña-Alonso, Guillén, Martín-San-Román, Raquel, Cai, Ruolin, Cai, Jifeng, Qian, Quan, Maoshi, Wen, Beardsell, Alec, Pirrung, Georg, Ramos-García, Néstor, Shi, Wei, Fu, Jie, Corniglion, Rémi, Lovera, Anaïs, Galván, Josean, Nygaard, Tor Anders, dos Santos, Carlos Renan, Gilbert, Philippe, Joulin, Pierre-Antoine, Blondel, Frédéric, Frickel, Eelco, Chen, Peng, Hu, Zhiqiang, Boisard, Ronan, Yilmazlar, Kutay, Croce, Alessandro, Harnois, Violette, Zhang, Lijun, Li, Ye, Aristondo, Ander, Alonso, Iñigo Mendikoa, Mancini, Simone, Boorsma, Koen, Savenije, Feike, Marten, David, Soto-Valle, Rodrigo, Schulz, Christian, Netzband, Stefan, Bianchini, Alessandro, Papi, Francesco, Cioni, Stefano, Trubat, Pau, Alarcon, Daniel, Molins, Climent, Cormier, Marion, Brüker, Konstantin, Lutz, Thorsten, Xiao, Qing ORCID logoORCID: https://orcid.org/0000-0001-8512-5299, Deng, Zhongsheng, Haudin, Florence and Goveas, Akhilesh;