'Offshore LNG mooring and offloading concepts can significantly affect the operability of LNG FPSOs or FRSUs in wind, waves and current. To determine this operability, dedicated numerical simulation tools are necessary. The present paper focuses on recent simulation tool developments for the evaluation of tandem (or stern-to-bow) offloading, side-by-side (or side-toside) offloading and offloading alongside a Gravity Based Structure (GBS). Complex hydrodynamic interactions and wind interaction effects are discussed in detail.

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