This paper reports the results of using incompressible smoothed particle hydrodynamics (I-SPH) to model large wave impacts on a vertical structure. SPH is a meshfree method which is ideally suited to flows in which large deformations occur. The SPH results obtained display the key features of wave impacts that have been observed experimentally for a range of wave heights. For greenwater impacts, the pressure profiles on the vertical impact wall are also in qualitative agreement with those observed in experiments. However for impacts in which the water is aerated the pressure profiles produced by the SPH model are less good, and it is believed that for improved predictions a two-phase I-SPH model will be needed.
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