Turbine cooling represents a critical challenge in gas turbine technology. The continuous demand for higher efficiency and power output requires increased turbine inlet temperatures, making effective cooling strategies essential to preserve the structural integrity and extend the service life of hot-section components. Internal and external cooling mechanisms are therefore employed. Part of the compressor air is routed through dedicated channels inside of the secondary air system that feeds the cooling channels, while the hot main flow interacts with the external surface. The combined effect of these processes governs the overall thermal performance of the turbine. Among the available techniques, rib-turbulated channels are widely adopted, as they enhance heat transfer by breaking the boundary layer, thus promoting turbulence.