This study aims at proposing a new geometry for an onshore Oscillating Water Column (OWC) device, in which the exterior front wall has a slope in the opposite direction from that of the incident wave.

The study consists of the analysis in a physical and numerical model of the vertical distribution of pressure induced by maritime agitation incident on pillars with a circular section, positioned vertically and inclined. The study is carried out for three conditions, two tidal levels and three pillar foundation depths, was carried out to scale 1:22 in the channel of irregular waves, COI2 do LNEC, with 60 m of length, 3 m 3 m wide and 2 m high.

A numerical model is used to model the interaction between the incident wave and the device. The novel geometry of this OWC enables higher extracted energy as compared to standard ones. The best performance is reached when considering an external front wall slope of 40° and internal wall slopes of 40° and 52°.