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The complexity of flow structure and the interactions of design parameters are the main reason of lack of an acceptable design procedure and accurate theoretical flow field model describing the real flow conditions in the cross flow fans. There were some theoretical approaches created the analytical models adequate to real flow conditions, but all of them required the experimental results for the solution. In this paper the description of two programs working in two different numerical methods applied to the flow simulations have been presented. The used programs are based on the different methods and algorithms: Flo++ (full package of CFD) based on the Finite Volume Methods (FVM) and the second solver Y-Flow Rota working with Ansys based on the Finite Element Methods (FEM). [ABSTRACT FROM AUTHOR]

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