Acceleration of BEM using CUDA/GPU programming with application to marine renewable energy extraction

Koutsogiannakis, Panagiotis

dc.contributor.author	Koutsogiannakis, Panagiotis	en
dc.date.accessioned	2019-03-22T10:07:21Z
dc.date.available	2019-03-22T10:07:21Z
dc.date.issued	2019-03-22
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/48514
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.16422
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	GPGPU programming	en
dc.subject	Marine renewable energy	en
dc.subject	Hydrodynamic modeling	en
dc.subject	Lifting flows modeling	el
dc.subject	Μέθοδος Συνοριακών Στοιχείων	el
dc.subject	Προγραμματισμός Καρτών Γραφικών	el
dc.subject	Θαλάσσια ανανεώσιμη ενέργεια	el
dc.subject	Υδροδυναμική μοντελοποίηση	el
dc.subject	Μοντελοποίηση ανωστικών ροών	el
dc.title	Acceleration of BEM using CUDA/GPU programming with application to marine renewable energy extraction	en
dc.contributor.department	Εργαστήριο Ναυτικής και Θαλάσσιας Υδροδυναμικής	el
heal.type	bachelorThesis
heal.classification	Hydrodynamics--Mathematical models	en
heal.classification	Boundary element methods	en
heal.classification	Marine renewable energy	en
heal.classification	GPGPU programming	en
heal.classificationURI	http://id.loc.gov/authorities/subjects/sh2008105960
heal.classificationURI	http://id.loc.gov/authorities/subjects/sh88001604
heal.language	en
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2019-02-14
heal.abstract	In the present thesis a biomimetic flapping-foil device is studied for the exploitation of marine renewable energy resources. As a first approximation, the lifting body is submerged far from the free surface, neglecting the interaction with the additional boundary. The device is semi-activated, i.e. a pitching motion is enforced and a heaving motion is induced by an alternating lift, produced in the presence of the current. For this purpose a Boundary Element Method (BEM) in its 3-dimensional version is applied. A Morino-type Kutta condition is imposed on the trailing edge and, by linearizing the trailing vortex sheet dynamics, a simplified wake model is used. However, the motion of the body and the initial shape of the wake are not linearized. The present method, after enhancement and further verification, can be applied to the design and control of such biomimetic devices extracting energy from waves and tidal currents nearshore. The performance of various integration quadratures for the calculation of singular integrals emerging in BEM are also investigated. Simple Gauss-Lobatto and Newton-Cotes quadratures, of arbitrary order, are embedded in an adaptive routine, enabling the treatment of singularities associated with the single/double layer potential induction factors. Different partitioning schemes are examined and the Richardson extrapolation technique is used to accelerate the convergence of the recursive quadrature routine. The developed numerical integration method is able to evaluate efficiently integrals with multiple singularities on N-dimensional hypercubes. The in-house GPU-accelerated computational code, developed by E.S. Filippas, is reprogrammed, by using object-oriented programming, extending the method to solve the problem of the semi-activated system. The parallelization parameters that affect performance are determined and a mixed precision arithmetic scheme is used to optimize the performance of the algorithm. The concepts of polymorphism and inheritance, incorporated in object-oriented programming, encourage the extension of the solver to treat different problems with similar structure in an elegant manner.	en
heal.advisorName	Belibassakis, Kostas	en
heal.committeeMemberName	Athanassoulis, Gerassimos	en
heal.committeeMemberName	Politis, Gerasimos	en
heal.academicPublisher	Σχολή Ναυπηγών Μηχανολόγων Μηχανικών	el
heal.academicPublisherID	ntua
heal.numberOfPages	112
heal.fullTextAvailability	true