Numerical analysis of the effects of free Surface on a fully Passive energy harvesting flapping foil device

Petikidis, Nikolaos; Πετικίδης, Νικόλαος

dc.contributor.author	Petikidis, Nikolaos	en
dc.contributor.author	Πετικίδης, Νικόλαος	el
dc.date.accessioned	2023-04-03T09:23:23Z
dc.date.available	2023-04-03T09:23:23Z
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/57466
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.25163
dc.rights	Αναφορά Δημιουργού 3.0 Ελλάδα	*
dc.rights	Αναφορά Δημιουργού 3.0 Ελλάδα	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/gr/	*
dc.subject	Υπολογιστική Ρευστομηχανική	el
dc.subject	Παλλόμενα πτερύγια	el
dc.subject	Ελεύθερη επιφάνεια	el
dc.subject	Παραγωγή ενέργειας	el
dc.subject	Παλιρροιακά ρεύματα	el
dc.subject	Flapping foils	en
dc.subject	fully passive	en
dc.subject	Tidal energy	en
dc.subject	Free surface	en
dc.subject	Energy production	en
dc.title	Numerical analysis of the effects of free Surface on a fully Passive energy harvesting flapping foil device	el
dc.title	Αριθμητική ανάλυση της επίδρασης της ελεύθερης επιφάνειας σε ένα πλήρως παθητικό flapping foil για παραγωγή ενέργειας	el
heal.type	bachelorThesis	el
heal.classification	Υπολογιστική ρευστομηχανική	el
heal.classification	Computational fluid dynamics	en
heal.language	en	el
heal.access	free	el
heal.recordProvider	ntua	el
heal.publicationDate	2023-03-01
heal.abstract	The aim of this thesis is to investigate the effects of the free surface on a fully passive flapping foil device. The in-house Computational Fluid Dynamics RANS solver MaPFlow is used, strongly coupled with a Rigid Body Dynamics solver. The problem is modeled in two dimensions, and the incompressible Navier-Stokes are solved, while the Volume of Fluid method is used to simulate the two phases, water and air. The structural parameters selected are held constant for all the cases. The influence a calm free surface is mainly examined, but initial research of the influence of waves also takes place. Firstly, the influence of varying the Submergence depth on the performance of the flapping foil for an initially calm free surface is examined. It is seen that for very low Submergence depths performance decreases greatly. However for intermediate depths performance is very good, even greater than the case where the flapping foil operates in infinite fluid. Increasing the submergence depth further, performance drops again slightly, and for very large depths, the case of infinite fluid is approached. These tests are also repeated for multiple Froude numbers. Although the Froude number affects the performance of the fully passive flapping foil, the same pattern takes place irrespective of it. Thus, there exists an optimal submergence depth where the flapping foil’s operation is aided by the free surface. Finally, a few cases where regular waves propagate on the free surface are examined. It is seen that waves with frequency close to that of the flapping foil can aid its performance while high frequency waves do not.	el
heal.advisorName	Papadakis, George	en
heal.advisorName	Παπαδάκης, Γεώργιος	el
heal.committeeMemberName	Anyfantis, Konstantinos	en
heal.committeeMemberName	Belibassakis, Konstantinos	en
heal.committeeMemberName	Ανυφαντής, Κωνσταντίνος	el
heal.committeeMemberName	Μπελιμπασσάκης, Κωνσταντίνος	el
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Ναυπηγών Μηχανολόγων Μηχανικών. Τομέας Ναυτικής και Θαλάσσιας Υδροδυναμικής	el
heal.academicPublisherID	ntua	el
heal.numberOfPages	86 σ.	el
heal.fullTextAvailability	false
heal.fullTextAvailability	false
heal.fullTextAvailability	false