Abstract
Abstract Hybridisation of different wave energy conversion (WEC) technologies appears to be a promising approach to harness the available wave energy resource most efficiently over a wide range of metocean conditions and overcome some of the challenges facing the roll out of a competitive wave energy industry. This underlying idea, hybridisation, is in the genesis of a novel device being further developed in the OCEANERA-NET project WEC4PORTS, which had been proved under the SE@PORTS project. Said novel hybrid wave energy converter (HWEC) combines two well-known wave energy conversion principles, an oscillating water column (OWC) and a multi-reservoir (4 reservoirs in the present configuration) overtopping device (OTD) and has been developed for installation in multipurpose breakwaters — i.e., a structure that retains its primary function of providing sheltered conditions for port operations to develop and includes electricity production as an added co-benefit. In this paper focus is given to the three-dimensional numerical model developed with OpenFoam for comparing alternative configurations of this breakwater-integrated HWEC, by studying the hydrodynamic efficiency. In total, five alternative geometries were compared. A frequent sea-state off the northern Atlantic coast of Portugal near the northern outer rubble-mound breakwater of the port of Leixões — the research prototype — is considered.
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