Effects of floaters' hydrodynamics on the performance of tightly moored wave energy converters

Mavrakos, SA; Katsaounis, GM

dc.contributor.author	Mavrakos, SA	en
dc.contributor.author	Katsaounis, GM	en
dc.date.accessioned	2014-03-01T01:33:19Z
dc.date.available	2014-03-01T01:33:19Z
dc.date.issued	2010	en
dc.identifier.issn	1752-1416	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20375
dc.subject.other	Axisymmetric	en
dc.subject.other	Axisymmetric wave	en
dc.subject.other	Coupling terms	en
dc.subject.other	Different modes	en
dc.subject.other	Diffraction radiation	en
dc.subject.other	Dynamical model	en
dc.subject.other	Eigenfunction expansions	en
dc.subject.other	Expected power	en
dc.subject.other	First-order	en
dc.subject.other	Fluid regions	en
dc.subject.other	Hydrodynamic characteristics	en
dc.subject.other	Hydrodynamic pressure	en
dc.subject.other	Numerical results	en
dc.subject.other	Performance characteristics	en
dc.subject.other	Potential solutions	en
dc.subject.other	Radial velocity	en
dc.subject.other	Semi-analytical methods	en
dc.subject.other	Time domain	en
dc.subject.other	Velocity potentials	en
dc.subject.other	Wave energy converters	en
dc.subject.other	Buoys	en
dc.subject.other	Eigenvalues and eigenfunctions	en
dc.subject.other	Fluid dynamics	en
dc.subject.other	Hydrodynamics	en
dc.subject.other	Power takeoffs	en
dc.subject.other	Time domain analysis	en
dc.subject.other	Wave power	en
dc.subject.other	Wave energy conversion	en
dc.title	Effects of floaters' hydrodynamics on the performance of tightly moored wave energy converters	en
heal.type	journalArticle	en
heal.identifier.primary	10.1049/iet-rpg.2009.0191	en
heal.identifier.secondary	http://dx.doi.org/10.1049/iet-rpg.2009.0191	en
heal.language	English	en
heal.publicationDate	2010	en
heal.abstract	This study investigates the effect that several different floaters' geometries have on the performance characteristics of tightly moored vertical axisymmetric wave energy converters (WECs). A cylindrical buoy with and without vertical and horizontal skirts mounted at its bottom, a cone, as well as two piston-like arrangements, consisting of an internal floater (cone or cylinder) and an exterior torus, have been examined and comparatively assessed. The WEC's first-order hydrodynamic characteristics are evaluated using a linearised diffraction-radiation semi-analytical method. Axisymmetric eigenfunction expansions of the velocity potential are introduced into properly defined ring-shaped fluid regions surrounding the bodies and the potential solutions are matched at the boundaries of adjacent fluid regions by enforcing continuity of the hydrodynamic pressures and radial velocities. A dynamical model for the floaters' performance in time domain is developed that properly accounts for the floater's hydrodynamic behaviour, the coupling terms between the different modes of motion and of the power take-off mechanism. Numerical results are presented and discussed, in terms of the expected power production. The results show parametrically the effect that the varying hydrodynamic characteristics of each particular floater's geometry have on the investigated WEC's performance characteristics. © 2010 © The Institution of Engineering and Technology.	en
heal.publisher	INST ENGINEERING TECHNOLOGY-IET	en
heal.journalName	IET Renewable Power Generation	en
dc.identifier.doi	10.1049/iet-rpg.2009.0191	en
dc.identifier.isi	ISI:000284511300007	en
dc.identifier.volume	4	en
dc.identifier.issue	6	en
dc.identifier.spage	531	en
dc.identifier.epage	544	en