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

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

Βασιλίκης, Νικόλαος (EL)
Vasilikis, Nikolaos (EN)

ntua (EL)
Μπελιμπασάκης, Κωνσταντίνος (EL)
Πολίτης, Γεράσιμος (EL)
Αθανασούλης, Γεράσιμος (EL)

bachelorThesis

2017-02-01
2017-04-28
2017-04-28T10:16:16Z


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)


Σώματα (EL)
Απορροφώμενη (EL)
WEC (EL)
Interaction (EL)
Frequency (EL)
Υδροδυναμική (EL)
Υδροδυναμική συχνοτήτων (EL)
Αλληλεπίδραση (EL)
Power (EL)
BEM (EN)

Αγγλική γλώσσα

Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Ναυπηγών Μηχανολόγων Μηχανικών. Τομέας Ναυτικής και Θαλάσσιας Υδροδυναμικής (EL)

Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ελλάδα
http://creativecommons.org/licenses/by-nc-nd/3.0/gr/




*Η εύρυθμη και αδιάλειπτη λειτουργία των διαδικτυακών διευθύνσεων των συλλογών (ψηφιακό αρχείο, καρτέλα τεκμηρίου στο αποθετήριο) είναι αποκλειστική ευθύνη των αντίστοιχων Φορέων περιεχομένου.