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Abstract. The unsteady interaction between a shock wave and boundary layer over a transonic wing can lead to the generation of considerable separation zones and periodical shock wave motion along the airfoil chord. The phenomenon is called transonic buffet. In the present work the buffet phenomenon on a transonic airfoil is simulated numerically using second order finite-volume method. Unsteady Reynolds Averaged Navier-Stokes (URANS) equations with different turbulence models are integrated. Transonic airfoil P-184-15SR of TsAGI is used as a reference geometry with

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