Wind loads acting on an offshore floating structure are important for the global performance analysis and mooring design. In early design stages, detailed topside geometry may not be fully available; therefore, a wind-load analysis should be performed using simplified geometries. This study investigates the effect of geometric resolution on the wind loads acting on an FPSO using OpenFOAM. A grid sensitivity study was conducted, and the numerical setup was validated against experimental and existing CFD results. Wind-load simulations were then performed using high-, mid-, and low-resolution FPSO geometries. The results show that the mid-resolution geometry, in which pipelines and small topside equipment are removed, showed relative L₂ differences of 2.70%, 3.02%, and 7.78% from the high-resolution geometry for C_Fx, C_Fy, and CMz, respectively.