RANS CFD Model for Global Performance Evaluation of Floating Vessel in Extreme Head Waves

Abstract

Extreme waves acting on the floating vessel would cause serious physical behavior and could cause a catastrophic incident. Such phenomena should be put of high interest during the designing step of the floating vessel. The numerical CFD (Computational Fluid Dynamics) viscous fluid approach along with the recent development of computer hardware gives us advantages to simulate a huge number of scenarios in the very early design phase. The current study will explain the CFD method to investigate the global performance of stationer floating vessel Fn = 0 on its motion and green water occurrence due to extreme waves λ/L = 2.0. Based on the simulation results, the CFD model can handle well the green water on deck phenomenon during extreme head waves. The water on deck affected vessel pitch motion amplitude not symmetric under regular waves i.e. 8 degrees by stern and 6 degrees by bow. Similar results were also found in heave motion amplitude by the maximum +4 centimeter and minimum -12 centimeter. Those asymmetric results of heave & pitch motion amplitude under regular waves indicate the contribution of green water to the vessel motion. In addition, green water on deck only affects the motion amplitude but not the motion frequency.