Hydroelastic analysis of flapping foils by a coupled BEM-FEM with application to marine energy extraction devices

Ανεβλαβή, Δήμητρα; Anevlavi, Dimitra

dc.contributor.author	Ανεβλαβή, Δήμητρα	el
dc.contributor.author	Anevlavi, Dimitra	en
dc.date.accessioned	2020-04-07T20:38:20Z
dc.date.available	2020-04-07T20:38:20Z
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/50095
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.17793
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	Boundary element methods	en
dc.subject	Finite element methods	en
dc.subject	Fluid mechanics	en
dc.subject	Hydroelasticity	en
dc.subject	Μέθοδος πεπερασμένων στοιχείων	el
dc.subject	Μέθοδος συνοριακών στοιχείων	el
dc.subject	Biomimetics	en
dc.subject	Υπολογιστική ρευστομηχανική	el
dc.subject	Βιομιμητική	el
dc.subject	Υδροελαστικότητα	el
dc.title	Hydroelastic analysis of flapping foils by a coupled BEM-FEM with application to marine energy extraction devices	en
heal.type	bachelorThesis
heal.classification	Υπολογιστική μηχανική	el
heal.language	en
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2019-03-14
heal.abstract	Out of the numerous applications of biomimetic, aquatic inspired devices based on oscillating hydrofoils are able to achieve high levels of efficiency either for propulsion or for tidal energy extraction in nearshore and coastal regions. The ability to account and properly design for flexibility effects has the potential to further enhance the overall performance of such systems. In the present work, a hydro-elastic model is proposed for investigating the effects of chord-wise flexibility on the performance of flapping foils with variable flexural rigidity, and whose structural response is actuated by unsteady pressure field caused by the prescribed harmonic motion of the hydro-mechanical system. A fluid-structure interaction numerical method has been developed to simulate the time-dependent structural response of the oscillating hydrofoil. We present a low order boundary element panel method (BEM) for the unsteady hydrodynamics, coupled with a finite element method (FEM) for the cylindrical bending of thin elastic plates, based on the classical Kirchhoff-Love theory. Numerical results are presented concerning the performance of the system over a range of design and operation parameters, including Strouhal number, heaving and pitching amplitudes and effective angle of attack. To further illustrate the capabilities of the developed BEM-FEM coupled model, we validate the numerical scheme with experimental data, for the case of a chord-wise flexible thin plate under enforced heaving motion excited at the leading edge. The present model could serve as a useful tool in the design, assessment and control of biomimetic systems for renewable energy extraction.	en
heal.advisorName	Μπελιμπασσάκης, Κωνσταντίνος	el
heal.committeeMemberName	Πολίτης, Γεράσιμος	el
heal.committeeMemberName	Τριανταφύλλου, Γεώργιος	el
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Ναυπηγών Μηχανολόγων Μηχανικών. Τομέας Ναυτικής και Θαλάσσιας Υδροδυναμικής. Εργαστήριο Ναυτικής και Θαλάσσιας Υδροδυναμικής	el
heal.academicPublisherID	ntua
heal.numberOfPages	113 σ.
heal.fullTextAvailability	true