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Study on green water prediction for FPSOs by a practical numerical approach

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



This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).


The growing usage of permanently moored floating production storage and offloadings (FPSO) in harsh environment regions increases the frequency and severity of the green water problem. Many numerical researches on green water prediction for FPSOs have been carried out. Most of the past researches chose to neglect or consider only part of the effects by appendages and attachments, such as bilge keel, mooring lines, and risers. The influences of these appendages on green water prediction have not been thoroughly studied. This paper presents a practical numerical approach of green water prediction for FPSOs in irregular waves. The calculation of relative wave elevation is conducted in frequency domain, including linear and nonlinear effects of bilge keels, spread mooring system, and asymmetrically arranged risers. Numerical approach was applied to calculate the statistical distribution of relative wave elevation for an FPSO. Comparison with experimental results showed that the accuracy of relative wave motion prediction is significantly improved by incorporating the linear and nonlinear effects of bilge keels, mooring, and risers. Analysis of the results by different numerical models further indicated that the relative wave elevation at sides of the FPSO in oblique waves was strongly affected by bilge keel, mooring, and risers.

Publication metadata

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

Publication type: Article

Publication status: Published

Journal: Ocean Engineering

Year: 2017

Volume: 143

Pages: 88-96

Print publication date: 01/10/2017

Online publication date: 25/07/2017

Acceptance date: 19/07/2017

Date deposited: 30/07/2017

ISSN (print): 0029-8018

ISSN (electronic): 1873-5258

Publisher: Pergamon


DOI: 10.1016/j.oceaneng.2017.07.052


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