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In the internal cooling channel of gas turbine blades, the rib structure is practiced extensively to increase the heat transfer rate bypassing the cooling fluid that finishes the rib surface. This research aims to characterize heat transfer and pressure drop in the cooling duct with a rectangular cross-section with a solid V-rib and perforated V-rib. This research has been conducted using numerical analysis with the standard k-ω model. The channel to be tested is rectangular, with a width of 320 mm x 120 mm in height. The Reynold number ranges from 570, 1,300, 2,900, 3,700, 20,000, 40,000, 60,000, and 80,000. Construction ribs, rib height 10 mm, pitch 50 mm solid V-ribs, and variations of perforated V-ribs with hole diameters of 2 mm, 3 mm, 4 mm, 5 mm. The laminar and transition flow regimes have not significantly affected the solid V-rib and perforated V-rib configurations on heat transfer. For turbulent flow, heat transfer …