Numerical study of bilge-keel effect on parametric roll and water on deck for an FPSO

This research activity represents the logical continuation of the work documented in [1] and [2] on water on deck and parametric roll for an FPSO in regular waves. Here the same numerical method, based on a domain-decomposition strategy, is used to examine the platform with bilge keels, both without...

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Published in:Volume 11: Prof. Robert F. Beck Honoring Symposium on Marine Hydrodynamics
Main Authors: Greco, Marilena, Lugni, Claudio, Colicchio, Giuseppina, Faltinsen, Odd Magnus
Format: Book Part
Language:English
Published: American Society of Mechanical Engineers (ASME) 2015
Subjects:
Online Access:http://hdl.handle.net/11250/2469453
https://doi.org/10.1115/OMAE2015-41961
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spelling ftntnutrondheimi:oai:ntnuopen.ntnu.no:11250/2469453 2023-05-15T14:24:50+02:00 Numerical study of bilge-keel effect on parametric roll and water on deck for an FPSO Greco, Marilena Lugni, Claudio Colicchio, Giuseppina Faltinsen, Odd Magnus 2015 http://hdl.handle.net/11250/2469453 https://doi.org/10.1115/OMAE2015-41961 eng eng American Society of Mechanical Engineers (ASME) Proceedings ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering Volume 11: Prof. Robert F. Beck Honoring Symposium on Marine Hydrodynamics Norges forskningsråd: 223254 urn:isbn:978-0-7918-5659-8 http://hdl.handle.net/11250/2469453 https://doi.org/10.1115/OMAE2015-41961 cristin:1301820 Chapter Peer reviewed 2015 ftntnutrondheimi https://doi.org/10.1115/OMAE2015-41961 2019-09-17T06:53:19Z This research activity represents the logical continuation of the work documented in [1] and [2] on water on deck and parametric roll for an FPSO in regular waves. Here the same numerical method, based on a domain-decomposition strategy, is used to examine the platform with bilge keels, both without and with mooring-line system. It is found that bilge keels with length 40% of the ship length and with breadth the 3% of the ship breadth limit effectively the roll when instability is promoted by vertical bow motions in waves. In these conditions also the amount of the shipped water is substantially reduced. Large roll induced by the coupling with the lateral motions seems to be less well counteracted and remains close to 10° for steepness kA ≥ 0.2. This value is often set as maximum allowed amplitude for FPSOs in normal operational conditions. Also the effect on the shipped water is limited in this case. Increasing the bilge-keels breadth is confirmed to be beneficial but the combination of the mooring system with dynamic positioning appears needed for a proper control of the roll motion in the worst examined cases. acceptedVersion (c) 2015 by ASME Book Part Arctic NTNU Open Archive (Norwegian University of Science and Technology) Volume 11: Prof. Robert F. Beck Honoring Symposium on Marine Hydrodynamics
institution Open Polar
collection NTNU Open Archive (Norwegian University of Science and Technology)
op_collection_id ftntnutrondheimi
language English
description This research activity represents the logical continuation of the work documented in [1] and [2] on water on deck and parametric roll for an FPSO in regular waves. Here the same numerical method, based on a domain-decomposition strategy, is used to examine the platform with bilge keels, both without and with mooring-line system. It is found that bilge keels with length 40% of the ship length and with breadth the 3% of the ship breadth limit effectively the roll when instability is promoted by vertical bow motions in waves. In these conditions also the amount of the shipped water is substantially reduced. Large roll induced by the coupling with the lateral motions seems to be less well counteracted and remains close to 10° for steepness kA ≥ 0.2. This value is often set as maximum allowed amplitude for FPSOs in normal operational conditions. Also the effect on the shipped water is limited in this case. Increasing the bilge-keels breadth is confirmed to be beneficial but the combination of the mooring system with dynamic positioning appears needed for a proper control of the roll motion in the worst examined cases. acceptedVersion (c) 2015 by ASME
format Book Part
author Greco, Marilena
Lugni, Claudio
Colicchio, Giuseppina
Faltinsen, Odd Magnus
spellingShingle Greco, Marilena
Lugni, Claudio
Colicchio, Giuseppina
Faltinsen, Odd Magnus
Numerical study of bilge-keel effect on parametric roll and water on deck for an FPSO
author_facet Greco, Marilena
Lugni, Claudio
Colicchio, Giuseppina
Faltinsen, Odd Magnus
author_sort Greco, Marilena
title Numerical study of bilge-keel effect on parametric roll and water on deck for an FPSO
title_short Numerical study of bilge-keel effect on parametric roll and water on deck for an FPSO
title_full Numerical study of bilge-keel effect on parametric roll and water on deck for an FPSO
title_fullStr Numerical study of bilge-keel effect on parametric roll and water on deck for an FPSO
title_full_unstemmed Numerical study of bilge-keel effect on parametric roll and water on deck for an FPSO
title_sort numerical study of bilge-keel effect on parametric roll and water on deck for an fpso
publisher American Society of Mechanical Engineers (ASME)
publishDate 2015
url http://hdl.handle.net/11250/2469453
https://doi.org/10.1115/OMAE2015-41961
genre Arctic
genre_facet Arctic
op_relation Proceedings ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering Volume 11: Prof. Robert F. Beck Honoring Symposium on Marine Hydrodynamics
Norges forskningsråd: 223254
urn:isbn:978-0-7918-5659-8
http://hdl.handle.net/11250/2469453
https://doi.org/10.1115/OMAE2015-41961
cristin:1301820
op_doi https://doi.org/10.1115/OMAE2015-41961
container_title Volume 11: Prof. Robert F. Beck Honoring Symposium on Marine Hydrodynamics
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