This paper presents the results of a numerical and experimental study concerning the hydrodynamic performance of the SBM midscale Twin-Hull FLNG concept. SBM’s innovative design consists of two LNG carriers joined together, and converted into a single FLNG facility. This option provides both sufficient deck space and storage capacity while having the benefit of a conversion project, being reduced delivery schedule and lower costs. This results in an unusually wide vessel for which only very limited number of precedents exist.

Important hydrodynamic performance indicators such as first order motions, green water and bottom slamming are investigated by means of sea keeping tests. In these tests the scale model of the FLNG is subjected to moderate and harsh environmental conditions from various headings. The results are used to verify the numerical predictions of the global motions, wave drift forces and internal loads and to assess green water and bottom slamming loads.

Current coefficients were calculated by computational fluid dynamics (CFD) and validated with wind tunnel experiments. All load components (wind, wave, current) are then used to evaluate the ability of the vessel to weathervane. This paper presents the investigation of the quality of numeric predictions by comparing model test data against numerical data and hence it summarizes the hydrodynamic performance of the Twin-Hull.

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