Wave-structure interaction, is a highly complicated phenomenon as the impacting wave forces a movement to the structure which being partially constrained, generates an interference wave field. The wave load is a key parameter in the design process to ensure reliability and longevity of offshore structures. The main advantages of the proposed modelling approach are pointed out and the aspects that deserve further improvement are discussed. Obtained results are compared against laboratory experiments and results from other numerical models. This work illustrates the application of the Free/Libre and Open-Source Software (FOSS) code SPHERA v.9.0.0 (RSE S.p.A.) for the generation of regular waves, non-linear waves, and the wave impact with a fixed rigid offshore structure in a 2D wave flume. Particle-based methods have been proven to be particularly suitable to mimic these phenomena. When sea waves interact with an offshore structure, breaking and water sprays occur as well as two-phase flow due to air entrapment. Wave-wave interaction can cause non-linear phenomena leading to occasional wave heights much greater than the mean wave height in a sea state. The characterization of the wave-induced action plays a key role in this context. Reliable offshore structural design deserves proper definition of the loads that a structure must bear during the life cycle.
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