Performance prediction of flapping foil thrusters in waves using an unsteady vortex element method

Papakalodoukas, Ioannis; Παπακαλοδούκας, Ιωάννης

dc.contributor.author	Papakalodoukas, Ioannis	en
dc.contributor.author	Παπακαλοδούκας, Ιωάννης	el
dc.date.accessioned	2025-05-26T09:50:35Z
dc.date.available	2025-05-26T09:50:35Z
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/61950
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.29646
dc.rights	Default License
dc.subject	Flapping foil	en
dc.subject	Waves	en
dc.subject	Unsteady	en
dc.subject	Vortex element	en
dc.title	Performance prediction of flapping foil thrusters in waves using an unsteady vortex element method	en
dc.title	Πρόβλεψη υδροδυναμικής συμπεριφοράς παλλόμενης πτέρυγας σε κυματισμούς με την χρήση στοιχείων δινών	el
heal.type	bachelorThesis
heal.classification	Marine Hydrodynamics	en
heal.language	el
heal.language	en
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2025-02-05
heal.abstract	A 3-D unsteady vortex element method is applied to the analysis of a horizontal wing, in order to investigate quantitatively its propulsive performance. The foil undergoes a combined heaving and pitching motion at the same frequency, in a uniform inflow condition, due to the advance at a constant speed. Numerical results are presented vs experimental measurements for the propulsion thrust coefficient and the efficiency of the system over a range of motion parameters, including wing's aspect ratio, wing's shape, Strouhal number and phase lag between oscillatory motions. These results indicate the significance of 3-D effects and show that the present technique can serve for the design of this kind of propulsive systems with optimized performance. At the next stage, the wing is examined in a horizontal T-foil arrangement as an efficient propulsion system, and its performance in irregular head waves, characterized by a frequency spectrum, is studied. The numerical results are compared with data obtained from tank experiments, revealing strong agreement. This indicates that the method is suitable for use in the preliminary design of this propulsion augmentation system.	en
heal.advisorName	Prof. Belibassakis, Konstantinos	en
heal.committeeMemberName	Assoc.Prof. Papadakis, Giorgos	en
heal.committeeMemberName	Ass.Prof. Angelou, Manolis	en
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Ναυπηγών Μηχανολόγων Μηχανικών. Τομέας Ναυτικής και Θαλάσσιας Υδροδυναμικής	el
heal.academicPublisherID	ntua
heal.numberOfPages	117 σ.	el
heal.fullTextAvailability	false