Jet impingement is utilized in thermal management applications due to its high heat transfer performance, with surface roughness serving as an effective passive enhancement technique. As ribs influence turbulent flow and heat transfer, existing studies often use limited geometries or fixed placements. Consequently, the combined effects of rib height and position on thermal enhancement remain insufficiently explored [1]. In this study, a slot jet is simulated for a jet-Reynolds number of Rej = 10,600 using Reynolds-Averaged Navier–Stokes (RANS) simulation, coupled with the GEKO turbulence model, as previously validated [2]. Four rib heights (e/Dj= 0.037, 0.056, 0.1, 0.25) and three streamwise (y) positions (y/Dj = 1, 2, 3), where 'e' denotes the rib height and 'Dj' stands for the jet slot width, are systematically investigated. Preliminary results show that small rib heights significantly increase the normalized average Nusselt number, whereas larger ribs hinder performance by promoting flow separation. Based on these initial findings, the research extends to Large Eddy Simulation (LES) to resolve the unsteady flow structures responsible for the heat transfer characteristics. Indeed, LES can provide a deeper physical understanding of enhancement mechanisms, aiming to provide robust guidelines for optimized rib-roughened impingement cooling systems [3]. [1] Huang H., Sun T., Zhang G., Liu M., Zhou B., The effects of rough surfaces on heat transfer and flow structures for turbulent round jet impingement, Int. J. Therm. Sci., Vol. 166, 106982, 2021. [2] Mezzacapo A., D’Addio R., De Stefano G., A Computational Thermo-Fluid Dynamics Simulation of Slot Jet Impingement Using a Generalized Two-Equation Turbulence Model, Energies, Vol. 18, 14, 2025. [3] Salomone T., Piomelli U., De Stefano G., Wall-modeled and hybrid large-eddy simulations of the flow over roughness strips, Fluids, Vol. 8, 10, 2023.