The existence of a hull body against progressive waves could change the profile of the wave hitting the structure depending on the dimensions of the hull compared to the wavelength. The diffraction wave applies the first and second order forces on the body behind the first body. In this paper, the results obtained from numerical simulations of a cylindrical platform were compared with experimental data. Then, to examine the interaction between two floating structures, by placing two fixed and floating cylinders in front of the second-order Stokes wave, the effect of changing the distance between these cylinders is addressed to obtain the forces applied on the floating cylinder. Numerical analysis in the frequency domain is performed using the boundary element software in ANSYS-AQWA based on the 3D diffraction/radiation theory. According to the results achieved from AQWA, it can be concluded that by increasing the distance between the floating cylinder and the fixed cylinder, the diffraction force decreases and the maximum of this force occurs at higher frequencies. Moreover, at lower frequencies, less drift force is applied to the floating cylinder. Eventually, the drift force increase with the increasing wave frequency. By examining the effect of increasing the radius of the floating cylinder, it can be seen that as the cylinder radius increases, the amount of drainage force and the dispersion of the floating cylinder increases with a higher rate.
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