Difficulties in 3D models simulation related to large number of cells and nodes lead to higher hardware requirements and large sets of equations for solving VoF model in CFX solver. To simplify the computational load we will use only one column vertical cross section because the vertical motion will determine effect of heave plates due to increased additional mass. Simplified Computational Fluid Dynamics(CFD) lead to fast simulation results and realistic vertical motion analysis. The column is

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... itted with heave plate and during the vertical motion simulation the angle of incidence between freesurface and column will be modified as a set parameter. Based on Ansys CFX software and VoF method the column will be submerged in saltwater and released with an excess of buoyancy equivalent to 0,4 meters movement of COG. Graphical results are presented for simulated situations and all results show Keywords: heave plate; wave response, vertical motion, Ansys VoF. Fig.2. Triangular shaped semisubmersible in Modelmaker 92