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This paper deals with the numerical investigation of the in-cylinder flow structures under steady-state conditions utilizing the finite-volume CFD package, STAR CCM+. Two turbulence models were used to simulate the turbulent flow structure namely, Realizable k-ε and Reynolds Stress Turbulence Model, RSTM. Three mesh densities of polyhedral type are examined. The three-dimensional numerical investigation has been conducted on an engine head of a pent-roof type (Lotus) for a number of fixed valve lifts (2mm, 5mm, 8mm) at two pressure drops 2451.662 Pa and 6227.222 Pa that is equivalent to engine speeds of 2500 and 4000 RPM respectively. This correlation between pressure drop and engine speed is provided by Lotus engineering according to real engine studies. Based on the comparison between two turbulence models, the turbulent flow structure was simulated using RSTM model for a number of tumble and swirl planes.