Simulation Of FPSO-LNG Multi-body System Hydrodynamics

Analysing the hydrodynamics of FPSO mooring system in the wind/wave/current condition is necessary work to be done in the primary stage of design, especially the multi-body hydrodynamics and the effect of sloshing. In this paper, several simulations about FPSO-LNG multi-body system have been done according to the published model tests. Several aspects below summarize the research:1. A simulation both in frequency domain and time domain has been done dealing with the turret FPSO mooring system under the wind/wave/current condition. The motions of FPSO in 6 degrees are given out, and the mean wave drift forces are discussed. The mooring forced are investigated using AQWA. According to the motions and forces an array of mooring lines is determined.2. In this paper, the FPSO-LNG multi-body hydrodynamices are discussed without thinking the sloshing effect first. According to different model tests, the damping factor is determined. This is the foundation of following work.3. The coupling and interactions between ship motion and inner-tank sloshing are investigated by a potential method in frequency domain. The effect of filling ratio is discussed according to model tests. Based on former work a 2 ships model with tanks is built, and the multi-body-sloshing effects are investigated.