The flow fields and performances of different transonic radial compressors of varying geometries and conceptual designs have been studied numerically. All the simulations were performed with a modified in-house 3D RANS solver based on an object-oriented open-source library. The solver uses an All-Mach algorithm with a special treatment for the pressure corrector equation to deal with highly compressible flows. The 3D flow field structures, the characteristics and integral quantities have been compared to the results of established, state-of-the-art commercial solvers as well as to measurements whenever possible. This paper demonstrates for various configurations that the main flow features and the flow characteristics have been captured by the new solver. Furthermore, the new solver is also capable of computing the delta variations of similar designs. This is an essential step for the broad application of the new solver for optimization design cycles.

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