Offshore Wind Energy is one of the most promising offshore renewable energies. Bottom fixed offshore wind turbines have reduced step by step their Levelized Cost of Energy. It relies both on CAPEX and OPEX reduction by optimizing the design. One of the key issues is a better assessment of the risks and reliability. As a consequence, the accuracy of the reliability assessement relies on the capacity to perform numerical computations giving accurate results for the safety analysis. In that framework, mechanical and hydrodynamical equations are often solved using discretization techniques such as the finite element method. These methods
introduce a discretization error which deteriorates the quality of the analysis. However, bounds on the exact solution on a quantity of interest may be computed a posteriori. This paper focuses on the fatigue assessment of a critical part of Offshore SubStations : the connection between the pile and the jacket. An approach is presented to propagate bounds computed on stress to the damage and guide remeshing in order to reduce the discretization error on the damage.


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The MUSCAS project was carried out within the framework of the WEAMEC, and with funding from Pays de la Loire Region, by Nantes University.