Abstract
Tidal stream and wave energy resources may have the potential to complement the exploitation of wind power currently promoted, in industrial countries, as one of the alternatives to fossil fuel energies. However, despite a wide range of energy converters tested and deployed in real sea conditions, the exploitation of tidal and wave resources still shows high economic uncertainties associated with the reduced lifespan and performance of devices. This has led to the failure of a series of innovative projects and reduced subsidies and investments. Thus, prior to the deployment of energy converters, refined numerical assessments are required to optimize the design and locations of devices while improving the economic reliability of projects. This Special Issue (SI) aims to promote original research papers and reviews dealing with numerical assessments of tidal stream and wave energy in coastal shelf seas