Numerical Simulation of Vortex-Induced Motion of a Deep Draft Semi-Submersible Platform

The vortex-induced motion (VIM) of deep draft semi-submersibles (DDS) could have critical impact on fatigue life of mooring and riser systems. In this paper, VIM of a DDS at different current incident angles is simulated using Shear Stress Transport (SST) based delayed detached-eddy simulation (DDES) model. The numerical simulations are carried out by the in-house CFD solver naoe-FOAM-SJTU which is developed on the open source platform OpenFOAM. The nominal response of sway motion is presented and compared with experimental data. For different current incident angles, time histories, trajectories and vorticity of the DDS at different reduced velocities are reported. The result shows our CFD solver naoe-FOAM-SJTU is applicable and reliable to study VIM of semi-submersibles.

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