In this research, viscous, unsteady and turbulent fl uid fl ow is simulated numerically around a pitching NACA0012 airfoil in the dynamic stall area. The Navier-Stokes equations are discretized based on the fi nite volume method and are solved by the PIMPLE algorithm in the open source software, namely OpenFOAM. The SST k – model is used as the turbulence model for Low Reynolds Number fl ows in the order of 105. A homogenous dynamic mesh is used to reduce cell skewness of mesh to prevent non-physical oscillations in aerodynamic forces unlike previous studies. In this paper, the effects of Reynolds number, reduced frequency, oscillation amplitude and airfoil thickness on aerodynamic force coeffi cients and dynamic stall delay are investigated. These parameters have a signifi cant impact on the maximum lift, drag, the ratio of aerodynamic forces and the location of dynamic stall. The most important parameters that affect the maximum lift to drag coeffi cient ratio and cause dynamic stall delaying are airfoil thickness and reduced frequency, respectively

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