In this diploma thesis, the flow of a wind tunnel with a linear blade cascade is calculated with CFD (Computational Fluid Dynamics). An overview of wind tunnels is given and the relevant components of a wind tunnel for this work are described. The used turbulence models are annotated. The construction of the created model of the wind tunnel in GAMBIT is represented and the used settings in the CFD program FLUENT are specified. The results of the calculations with the applied turbulence models are compared against each other. Further on the results of the calculated velocity distribution are compared with measured data on the wind tunnel. Special focus is laid on the Reynolds stresses, because these relations give direct information about the flow condition. Finally a view of further operations is given.