Reliable offshore structural design deserves proper definition of the loads that a structure must bear during the life cycle. The characterization of the wave-induced action plays a key role in this context. Wave-wave interaction can cause non-linear phenomena leading to occasional wave heights much greater than the mean wave height in a sea state. When sea waves interact with an offshore structure, breaking and water sprays occur as well as two-phase flow due to air entrapment. Particle-based methods have been proven to be particularly suitable to mimic these phenomena. 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. Obtained results are compared against laboratory experiments and results from other numerical models. The main advantages of the proposed modelling approach are pointed out and the aspects that deserve further improvement are discussed.
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