Work

A multi-fidelity approach for the evaluation of extreme wave loads using nonlinear response-conditioned waves

Year: 2024

Type: article

Abstract: In the present study, a multi-fidelity methodology based on response-conditioned waves (RCW) is demonstrated for the probabilistic assessment of wave-induced loads and responses of offshore structures . The methodology consists of two steps: (i) the RCW are determined using a surrogate response model and (ii) they are reproduced in an experimental or CFD-based numerical wave tank (NWT) to obtain the fully nonlinear response , as a high-fidelity evaluation. The main novelty of the proposed response-conditioning technique is that it uses a fully nonlinear wave solver that calculates the wave propagation inside an NWT. In this work, the extreme Vertical Bending Moment (VBM) of a zero-speed containership is investigated. It is found that the proposed approach provides nonlinear wave sequences that can be explicitly and exactly reproduced experimentally, up to very extreme sea states ( H s = 17 m, T p = 15 . 5 s). Moreover, through comparison of the obtained results with an experimental Monte Carlo approach , it is shown that the overall framework can predict the short-term distribution of the VBM accurately and efficiently. Finally, given that model tests are costly and not widely accessible, the implementation of the high-fidelity response evaluation within a CFD-based NWT is also demonstrated and validated against the available experimental results.

Source: Ocean Engineering

DOI: 10.1016/j.oceaneng.2024.119919

Authors: Athanasios Dermatis, Marine Lasbleis, Shinwoong Kim, Guillaume De Hauteclocque, Benjamin Bouscasse, Guillaume Ducrozet