In a new concept of offloading operation, the oil from a spread moored FPSO is transferred to a conventional Tanker with an intermediate Cargo Transfer Vessel (CTV) equipped with a DP system. A comprehensive numerical analysis of the CTV offloading operation is here developed considering the sea states in the Libra Field, Brazil. First, the environmental loads on the vessels were estimated. Current and wind forces coefficients were obtained using the CFD software StarCCM+, while wave coefficients were obtained using WAMIT. For the 10-year metocean data, the multi-body static equilibrium configurations of the system – composed of the CTV, Conventional Tanker and Tugboat - were calculated. With those results, it was possible to estimate the downtime considering different offloading sectors and to compare with the DP Shuttle Tanker operation. Finally, a 5-day campaign of real-time simulations was carried out with the presence of DP Operators and captains, to verify critical conditions, considering the human factor. Each vessel was simulated in an individual cabin. For the simulations, the real DP System was integrated with the numerical simulator in a Hardware-in-the-loop configuration, resulting in a more realistic simulation.

在卸载操作的新概念中，来自散布式FPSO的油通过带有DP系统的中间货物转运船（CTV）转移到常规的油轮中。考虑到巴西天秤座海域的海况，在此对CTV卸载操作进行了全面的数值分析。首先，估算船舶的环境负荷。使用CFD软件StarCCM +获得了电流和风力系数，而使用WAMIT获得了波浪系数。对于10年的海洋数据，计算了系统的多体静态平衡配置-由CTV，常规油轮和拖船组成。通过这些结果，可以估计考虑不同卸货部门的停机时间，并与DP Shuttle Tanker的运行进行比较。最后，在DP操作员和机长在场的情况下，进行了为期5天的实时模拟活动，以考虑到人为因素来验证关键条件。每个容器在单独的舱室中进行模拟。对于仿真，将真实的DP系统与数字仿真器集成在“硬件在环”配置中，从而实现了更加逼真的仿真。