Evaluation of the extreme loads on flap-type energy converters through numerical simulation

The objective of the present study is the evaluation of the extreme loads on flap-type energy converters through numerical simulation. For the present study the "SPH-Flow" code is adopted. This solver is co-developed by Ecole Centrale de Nantes and Hydrocean and is based on the SPH scheme.After a brief description of the numerical model, the methodology followed in the present study is discussed. Strengths and weaknesses of the analysis are clearly addressed along with a discussion of the critical elements of the study. A large test-case matrix is then presented in order to address the influence of the wave shape on the impact, the effects of a possible blockage of the flap and, eventually, the load prediction in survival configuration. Finally, the most critical test cases have been reproduced in the 3D framework, providing a detailed analysis of the 3D free-surface evolution at the impact. Comparisons between 2D and 3D results are also provided.