The focus of this thesis is to obtain the damping response for the structure of an offshore wind turbine subjected to different frequencies, consistent with the most probable sea conditions. The simulations replicate a hypothetical testing facility, where a floating body is in controlled motion and the dynamic response of the system is analyzed, treating the water-body system as a mass-spring-damper. The simulations are performed using the CFD software "Star CCM+", based on the RANS model. The results will be compared to a linear BEM model obtained from the software NEMOH, with corrections introduced to achieve higher-fidelity data, while maintaining the simplicity and low computational cost of the linear BEM simulations.