Survivability of complex structures in highly energetic events is a major challenge that needs to be overcome for extracting energy from the waves at a competitive price. When complex 3D structures are considered, experimental tests are often time and money consuming. Computational Fluid Dynamics (CFD) have become very popular in industry and academia, because of its relative ability to accurately simulate multiple extreme wave events at the same time and to complement experimental data. The aim of this work is to analyze the hydrodynamic response of a moored floating offshore wind turbine (FOWT) under different constant currents (in magnitude and direction) with the numerical CFD model OpenFOAM [1]. The Overset Mesh Library [2,3] will be used for calculating the large displacements of the interaction of a moored FOWT under constant currents. MooDy Library [4] will be used to compute the mooring restraints. The stabilized turbulence model by Larsen & Fuhrman [5] has been included in the model in order to deal with the overproduction of turbulence levels. Loads exerted on the structure will be analyzed. REFERENCES: [1] ESI-Group, Openfoam the open source cfd toolbox. URL https://www.openfoam.com/ [2] Di Paolo, B., Lara, J.L., Barajas, G., Paci, A. and Losada, I.J., 2018, June. Numerical analysis of wave and current interaction with moored floating bodies using overset method. In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering (pp. V002T08A037- V002T08A037). American Society of Mechanical Engineers. [3] Barajas, G., Lara J., Di Paolo, B., Losada, I.J. Analysis of a floating wave energy converter interaction with waves using the Overset framework (2021). 9Th Conference on Computational Methods in Marine Engineering (MARINE) DOI: 10.2218/marine2021.6791 [4] J. Palm, C. Eskilsson, G. M. Paredes, L. Bergdahl. Coupled mooring analysis for floating wave energy converters using CFD: Formulation and validation. International Journal of Marine Energy, ISSN: 2214-1669, Vol: 16, Page: 83-99. [5] B. E. Larsen, D. R. Fuhrman, On the over-production of turbulence beneath surface waves in Reynolds-Averaged Navier-Stokes models, Journal of Fluid Mechanics 853 (2018) 419– 460.