October 2022
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2 Citations
In work package 2 of the FLOATECH project a detailed validation and verification of the capabilities of QBlade-Ocean is carried out. A detailed description of the models used in the validation is provided in Deliverable 2.1 and results of the validation that was carried out are presented in Deliverable 2.2. Some modifications to the models used in Task 2.1 have been adopted in Task 2.2, as described in deliverable D2.3, in order to have more realistic results when full scale FOWT models are considered. This document is based on the work described in the previous deliverables and aims to report a comprehensive code-to-code comparison, thus supporting a quantification study of the uncertainty in the predicted FOWT behaviour. Starting from the data gathered in the database collected through deliverable D2.3, containing Floating Offshore Wind Turbine (FOWT) calculations in various design load situations, computed with three different codes, a comprehensive comparison of simulation results is then reported. Three FOWT concepts are simulated in a variety of design load cases (DLCs), as explained in the D2.3 deliverable document. The analysis procedure applied to the gathered simulation data has resulted in a comprehensive report that includes various aspects related to the behaviour of FOWTs. The report presents global statistics such as mean value, maximum and minimum value of relevant motion and load related data. Extreme loads have also been calculated according to standardized procedures. The report further presents fatigue loads represented by Damage Equivalent Loads (DELs) for the main FOWT components. A comparison of the results between the three codes for each of the considered FOWT models has been included, followed by a discussion of the outcomes of the comparison. The aim of the discussion is to identify reasonable explanations for the differences between codes and quantify the uncertainty related to the use of state-of-the-art numerical codes for the prediction of FOWTs behaviour. Overall, the report offers a comprehensive analysis of FOWTs that provides valuable insights into their behaviour and highlights the need for continued research to improve the accuracy of numerical models.