The global shift towards net-zero emission energy systems has heightened interest in sustainable developments and renewable energy alternatives, with wind emerging as a key resource. However, conventional methods struggle to access wind resources in deepwater areas. Floating Offshore Wind Turbines (FOWTs) have overcome this limitation, enabling the harnessing of wind energy at previously inaccessible deep-water sites. To extend the operational life of FOWTs, it is crucial to minimize undesirable loads and motions. This project investigates a methodology for high-fidelity, coupled simulation of FOWTs in OpenFOAM. The waves2Foam tool by (Jacobsen etal. 2012), utilizing the relaxation zone method, is employed for wave generation and absorption, while mooring restraints are computed using a quasisteady catenary model. The multiphase simulation employs the waveDyMFoam solver, modified by the interFoam solver, incorporating dynamic mesh techniques. Fluid-structure interaction (FSI) coupling is implemented through a PIMPLE-based, serial sub-iterating strategy. The methodology was developed incrementally, beginning with the Tuned Liquid Column Damper (TLCD) implementation, validated against existing studies. Free-decay analysis was then conducted on a wave energy converter (WEC), confirming the damping performance of a TLCD applied with varying mass ratios. Eventually, motion mitigation was obtained in free decay condition by 47.80% with a 4% mass ratio TLCD application and 37.01% achieved under regular wave conditions. The methodology successfully demonstrates the damping performance of TLCD and Tuned Liquid Multi Column Damper (TLMCD) applications on floating objects under wave conditions, making it a reliable technique for TLMCDs in FOWT modeling.