Numerical and experimental investigation of the dynamics of catenary risers and the riser-induced-damping phenomenon

Chatjigeorgiou, IK; Damy, G; Leboulluec, M

dc.contributor.author	Chatjigeorgiou, IK	en
dc.contributor.author	Damy, G	en
dc.contributor.author	Leboulluec, M	en
dc.date.accessioned	2014-03-01T02:51:46Z
dc.date.available	2014-03-01T02:51:46Z
dc.date.issued	2008	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/35634
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-77953650830&partnerID=40&md5=cc77d7a7e4e2540b874493bb337407bf	en
dc.subject.other	Catenary riser	en
dc.subject.other	Drag forces	en
dc.subject.other	Experimental investigations	en
dc.subject.other	Floating structures	en
dc.subject.other	Horizontal forces	en
dc.subject.other	Arctic engineering	en
dc.subject.other	Drag	en
dc.subject.other	Mooring	en
dc.subject.other	Damping	en
dc.title	Numerical and experimental investigation of the dynamics of catenary risers and the riser-induced-damping phenomenon	en
heal.type	conferenceItem	en
heal.publicationDate	2008	en
heal.abstract	Catenary risers can be equally efficient as catenary moorings in producing damping which is subsequently offered to the floating structure. Mooring-induced-damping has been investigated adequately in the recent past. The same however is not valid as far as the contribution of risers is concerned, lt should be acknowledged that the main source of damping, i.e. the drag forces, is higher in risers than in moorings as the external diameter of the former is larger and the drag coefficients, at least assuming a Morison's formula, are comparable. Therefore, the investigation of the so called riser-induced-damping phenomenon is an interesting issue. The present work is a contribution to this direction. This is performed both numerically and experimentally. For estimating damping the method proposed by Brown and Mavrakos (1999) is followed. Thus, damping due to risers is represented by the equivalent linearized coefficient the calculation of which lies on the knowledge of the energy dissipated per cycle that is calculated with the aid of the horizontal force applied at the top of the structure. Copyright © 2008 by ASME.	en
heal.journalName	Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE	en
dc.identifier.volume	1	en
dc.identifier.spage	671	en
dc.identifier.epage	680	en