Hydrodynamic analysis of floating offshore wind turbine concepts: a case study in Black Sea

Yıldırım, Büşra
In the literature, well-validated hydrodynamic programs such as WAMIT are used to analyze the hydrodynamics of floating offshore wind turbines (FOWTs). In this thesis, potential use of an opensource hydrodynamic solver for the hydrodynamic modeling of FOWTs is investigated using HAMS. For this purpose, hydrodynamic coefficients obtained from HAMS are compared to the first-order hydrodynamic solution of AQWA and WAMIT. The hydrodynamic model of three FOWT concepts, such as OO-Star, Nautilus, and CENTEC TLP, is compared in terms of the added mass, radiation damping, and wave excitation forces. The result of this objective presents that HAMS provides an accurate solution compared to WAMIT and AQWA models. In the case of CENTEC TLP, the hydrodynamic coefficients are almost the same, especially for smaller frequencies (smaller than 2 rad/s). Verified hydrodynamic coefficients are used as input to OpenFAST and coupled analysis of FOWTs is carried out for the benchmark load cases. The effects of the hydrodynamic modeling program on the system behavior are investigated such as power generation, system motion and mooring tension. The final objective of this thesis is to examine whether a previously designed FOWT concept can be applied to a different site without requiring any further optimization. For this purpose, the environmental conditions of the potential site in the Black Sea were computed, and numerical analyses were carried out to evaluate whether the three FOWT concepts can be applied or not. Although the numerical results showed that the three systems were operable in the selected area, further detailed analyses are required for a precise application.


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Citation Formats
B. Yıldırım, “Hydrodynamic analysis of floating offshore wind turbine concepts: a case study in Black Sea,” M.S. - Master of Science, Middle East Technical University, 2022.