Effects of the asymmetric riser and bilge keel arrangements on FPSO green water assessment |
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| Affiliation: | 1. State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China;2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai, 200240, China;3. Department of Naval Architecture and Marine Engineering, University of Strathclyde, Glasgow, G11XQ, United Kingdom;1. Department of Civil and Environmental Engineering, National University of Singapore, Singapore;2. School of Civil and Environmental Engineering, Cornell University, USA;3. Institute of Hydrological and Oceanic Sciences, National Central University, Taiwan;4. Shandong Provincial Key Laboratory of Ocean Engineering, Ocean University of China, Qingdao, China;1. Department of Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China;2. Hubei Key Laboratory for Engineering Structural Analysis and Safety Assessment, Wuhan 430074, China;3. Ocean College, Zhejiang University, Hangzhou 310058, China |
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| Abstract: | 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. |
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| Keywords: | Green water Relative wave elevation Asymmetric risers Truncated bilge keel Response-based analysis Short-term Long-term prediction |
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