Fully Coupled Analysis of an Offshore Deck Mating Operation of a Large Topside Module

Abstract

A fully coupled analysis is carried out to evaluate the offshore mating operation for a large heavy topside module on a deck of floating liquefied natural gas (FLNG). Fully coupled hydrodynamic interactions are considered between a crane vessel lifting the heavy topside module and the FLNG. Multiple crane wires and slings are modeled with linear springs, while the leg mating unit (LMU) guide is modeled with bilinear springs. Special attention is paid to the accurate prediction of coupled hydrodynamic coefficients and pendulum dynamics of heavy hanging objects. Simulation results are validated by comparing model test results on key parameters affecting the deck mating operations on-site. Good agreement has been obtained between the simulations and the model tests.