Browsing by Author "Bergua, Roger"
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Item OC5 Project Phase II: Validation of Global Loads of the DeepCwind Floating Semisubmersible Wind Turbine: Validation of Global Loads of the DeepCwind Floating Semisubmersible Wind Turbine(2017-10) Robertson, Amy N.; Wendt, Fabian; Jonkman, Jason M.; Popko, Wojciech; Dagher, Habib; Gueydon, Sebastien; Qvist, Jacob; Vittori, Felipe; Azcona, José; Uzunoglu, Emre; Soares, Carlos Guedes; Harries, Rob; Yde, Anders; Galinos, Christos; Hermans, Koen; de Vaal, Jacobus Bernardus; Bozonnet, Pauline; Bouy, Ludovic; Bayati, Ilmas; Bergua, Roger; Galvan, Josean; Mendikoa, Iñigo; Sanchez, Carlos Barrera; Shin, Hyunkyoung; Oh, Sho; Molins, Climent; Debruyne, Yannick; RENOVABLES OFFSHOREThis paper summarizes the findings from Phase II of the Offshore Code Comparison, Collaboration, Continued, with Correlation project. The project is run under the International Energy Agency Wind Research Task 30, and is focused on validating the tools used for modeling offshore wind systems through the comparison of simulated responses of select system designs to physical test data. Validation activities such as these lead to improvement of offshore wind modeling tools, which will enable the development of more innovative and cost-effective offshore wind designs. For Phase II of the project, numerical models of the DeepCwind floating semisubmersible wind system were validated using measurement data from a 1/50th-scale validation campaign performed at the Maritime Research Institute Netherlands offshore wave basin. Validation of the models was performed by comparing the calculated ultimate and fatigue loads for eight different wave-only and combined wind/wave test cases against the measured data, after calibration was performed using free-decay, wind-only, and wave-only tests. The results show a decent estimation of both the ultimate and fatigue loads for the simulated results, but with a fairly consistent underestimation in the tower and upwind mooring line loads that can be attributed to an underestimation of waveexcitation forces outside the linear wave-excitation region, and the presence of broadband frequency excitation in the experimental measurements from wind. Participant results showed varied agreement with the experimental measurements based on the modeling approach used. Modeling attributes that enabled better agreement included: the use of a dynamic mooring model; wave stretching, or some other hydrodynamic modeling approach that excites frequencies outside the linear wave region; nonlinear wave kinematics models; and unsteady aerodynamics models. Also, it was observed that a Morison-only hydrodynamic modeling approach could create excessive pitch excitation and resulting tower loads in some frequency bands.Item OC6 Phase II: Integration and verification of a new soil–structure interaction model for offshore wind design: Integration and verification of a new soil–structure interaction model for offshore wind design(2022-05) Bergua, Roger; Robertson, Amy; Jonkman, Jason; Platt, Andy; Page, Ana; Qvist, Jacob; Amet, Ervin; Cai, Zhisong; Han, Huali; Beardsell, Alec; Shi, Wei; Galván, Josean; Bachynski‐Polić, Erin; McKinnon, Gill; Harnois, Violette; Bonnet, Paul; Suja‐Thauvin, Loup; Hansen, Anders Melchior; Mendikoa Alonso, Iñigo; Aristondo, Ander; Battistella, Tommaso; Guanche, Raúl; Schünemann, Paul; Pham, Thanh‐Dam; Trubat, Pau; Alarcón, Daniel; Haudin, Florence; Nguyen, Minh Quan; Goveas, Akhilesh; Bachynski-Polić, Erin; Suja-Thauvin, Loup; Tecnalia Research & Innovation; RENOVABLES OFFSHOREThis paper provides a summary of the work done within the OC6 Phase II project, which was focused on the implementation and verification of an advanced soil–structure interaction model for offshore wind system design and analysis. The soil–structure interaction model comes from the REDWIN project and uses an elastoplastic, macroelement model with kinematic hardening, which captures the stiffness and damping characteristics of offshore wind foundations more accurately than more traditional and simplified soil–structure interaction modeling approaches. Participants in the OC6 project integrated this macroelement capability to coupled aero-hydro-servo-elastic offshore wind turbine modeling tools and verified the implementation by comparing simulation results across the modeling tools for an example monopile design. The simulation results were also compared to more traditional soil–structure interaction modeling approaches like apparent fixity, coupled springs, and distributed springs models. The macroelement approach resulted in smaller overall loading in the system due to both shifts in the system frequencies and increased energy dissipation. No validation work was performed, but the macroelement approach has shown increased accuracy within the REDWIN project, resulting in decreased uncertainty in the design. For the monopile design investigated here, that implies a less conservative and thus more cost-effective offshore wind design.