Hydrodynamic interaction and power absorption efficiency of wave energy converters in the frequency domain, using the boundary element method

Βασιλίκης, Νικόλαος; Vasilikis, Nikolaos

dc.contributor.author	Βασιλίκης, Νικόλαος	el
dc.contributor.author	Vasilikis, Nikolaos	en
dc.date.accessioned	2017-04-28T10:16:16Z
dc.date.available	2017-04-28T10:16:16Z
dc.date.issued	2017-04-28
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/44830
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.14205
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ελλάδα	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/gr/	*
dc.subject	Υδροδυναμική	el
dc.subject	Υδροδυναμική συχνοτήτων	el
dc.subject	Σώματα	el
dc.subject	Αλληλεπίδραση	el
dc.subject	Απορροφώμενη	el
dc.subject	BEM	en
dc.subject	Frequency	el
dc.subject	WEC	el
dc.subject	Power	el
dc.subject	Interaction	el
dc.title	Hydrodynamic interaction and power absorption efficiency of wave energy converters in the frequency domain, using the boundary element method	el
heal.type	bachelorThesis
heal.classification	Hydrodynamics	en
heal.classification	Wave energy conversion	en
heal.language	en
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2017-02-01
heal.abstract	The increasing interest in renewable energy has motivated a large number of researchers to deal with such themes. Although solar and aeolic applications are already in production, ocean energy means and specifically wave energy conversion through oscillating bodies is under development. This delay mainly lies on the complexity of such systems as interaction effects occur throughout the domain around them and not only in their wake, which is the case for wind turbines. First, the linear hydrodynamic and mechanical problems are presented, followed by the proper numerical boundary element method formulation applied. The necessary discretization program developed is also described. The motions and power absorption of a wave energy converter is dependent on three main factors. First on the exciting forces acting on the body, second on the characteristics of the body which can be divided in the hydrodynamic and in the mass distribution ones and finally on external factors like the ones of the power take-off mechanism. This thesis deals with the interaction effects concerning the hydrodynamic problem, examined for a number of array cylinder configurations in terms of exciting forces, added masses and damping coefficients. Specifically, near trapping relating effects were found to influence significantly the exciting forces magnitude hence the sensitivity of results on changing parameters like the separating distance and the position of the cylinders is significant. On the mechanical problem, motions and power absorption in wave energy farms are examined in the case of heaving power absorption of fully movable bodies, with all six degrees of freedom modelled. As observed appropriate design leading to frequency coincidence of some phenomena can built constructive effects, greatly improving the total efficiency of wave energy converter configurations.	en
heal.advisorName	Αθανασούλης, Γεράσιμος	el
heal.committeeMemberName	Μπελιμπασάκης, Κωνσταντίνος	el
heal.committeeMemberName	Πολίτης, Γεράσιμος	el
heal.committeeMemberName	Αθανασούλης, Γεράσιμος	el
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Ναυπηγών Μηχανολόγων Μηχανικών. Τομέας Ναυτικής και Θαλάσσιας Υδροδυναμικής	el
heal.academicPublisherID	ntua
heal.numberOfPages	164 σ.
heal.fullTextAvailability	true