Numerical and experimental investigation of the dynamics of catenary risers and the riser-induced-damping phenomenon
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...
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ftntunivathens:oai:dspace.lib.ntua.gr:123456789/35634 2023-05-15T14:20:54+02:00 Numerical and experimental investigation of the dynamics of catenary risers and the riser-induced-damping phenomenon Chatjigeorgiou, IK Damy, G Leboulluec, M 2008 http://dspace.lib.ntua.gr/handle/123456789/35634 unknown info:eu-repo/semantics/openAccess free Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE Catenary riser Drag forces Experimental investigations Floating structures Horizontal forces Arctic engineering Drag Mooring Damping info:eu-repo/semantics/conferenceObject 2008 ftntunivathens 2019-07-13T16:33:54Z 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. Conference Object Arctic Arctic National Technical University of Athens (NTUA): DSpace Arctic |
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Open Polar |
collection |
National Technical University of Athens (NTUA): DSpace |
op_collection_id |
ftntunivathens |
language |
unknown |
topic |
Catenary riser Drag forces Experimental investigations Floating structures Horizontal forces Arctic engineering Drag Mooring Damping |
spellingShingle |
Catenary riser Drag forces Experimental investigations Floating structures Horizontal forces Arctic engineering Drag Mooring Damping Chatjigeorgiou, IK Damy, G Leboulluec, M Numerical and experimental investigation of the dynamics of catenary risers and the riser-induced-damping phenomenon |
topic_facet |
Catenary riser Drag forces Experimental investigations Floating structures Horizontal forces Arctic engineering Drag Mooring Damping |
description |
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. |
format |
Conference Object |
author |
Chatjigeorgiou, IK Damy, G Leboulluec, M |
author_facet |
Chatjigeorgiou, IK Damy, G Leboulluec, M |
author_sort |
Chatjigeorgiou, IK |
title |
Numerical and experimental investigation of the dynamics of catenary risers and the riser-induced-damping phenomenon |
title_short |
Numerical and experimental investigation of the dynamics of catenary risers and the riser-induced-damping phenomenon |
title_full |
Numerical and experimental investigation of the dynamics of catenary risers and the riser-induced-damping phenomenon |
title_fullStr |
Numerical and experimental investigation of the dynamics of catenary risers and the riser-induced-damping phenomenon |
title_full_unstemmed |
Numerical and experimental investigation of the dynamics of catenary risers and the riser-induced-damping phenomenon |
title_sort |
numerical and experimental investigation of the dynamics of catenary risers and the riser-induced-damping phenomenon |
publishDate |
2008 |
url |
http://dspace.lib.ntua.gr/handle/123456789/35634 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic |
genre_facet |
Arctic Arctic |
op_source |
Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE |
op_rights |
info:eu-repo/semantics/openAccess free |
_version_ |
1766293375783272448 |