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Effects of the asymmetric riser and bilge keel arrangements on FPSO green water assessment

Lookup NU author(s): Dr Shuo Wang, Dr Xin WangORCiD, Dr Wai Lok Woo



This is the authors' accepted manuscript of an article that has been published in its final definitive form by Pergamon Press, 2019.

For re-use rights please refer to the publisher's terms and conditions.


This article aims to report important findings on how the asymmetric riser and bilge keel arrangements affect the motion response and green water assessment by using a real FPSO conversion project. Recently, the authors have proposed a practical approach for short-term and long-term green water prediction. In this paper, the method has been further extended to include the effect of truncated bilge keel by using Morrison elements. Numerical studies are conducted focusing on the effect induced by asymmetric riser arrangement and truncated bilge keels. Comparisons of short-term and long-term results between different models indicate that the FPSO’s motion is significantly affected by asymmetrically arranged appendages and attachments in a complicated way. The relative wave elevation is also affected by appendages and attachments, but not the same trend as the motion response. The effect of the asymmetric arrangement of risers and bilge keel on long-term relative wave elevation response has been captured by both traditional contour line approach and response-based analysis, but some discrepancy identified between the results from the two methods indicates the limitation of the traditional contour line approach.

Publication metadata

Author(s): Wang S, Wang X, Woo WL

Publication type: Article

Publication status: Published

Journal: Applied Ocean Research

Year: 2019

Volume: 86

Pages: 166-176

Print publication date: 01/05/2019

Online publication date: 07/03/2019

Acceptance date: 19/02/2019

Date deposited: 07/03/2019

ISSN (print): 0141-1187

ISSN (electronic): 1879-1549

Publisher: Pergamon Press


DOI: 10.1016/j.apor.2019.02.013

Notes: This journal has an embargo period of 24 months.


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