The use of fully unsteady CFD computations for centrifugal turbomachinery during preliminary design calculations is still infeasible due to the extensive computational efforts required. Most design-based CFD analyses for centrifugal machines are conducted on individual components using steady-state calculations. These steady calculations do not represent the interactions of the components with their neighboring blade rows, including the upstream rotating component. In this paper, commonly accepted CFD procedures for steady-state calculations are applied to the components of a centrifugal pump with a shrouded impeller and a vaned diffuser/volute. Evaluation of the validity of these calculations is conducted by comparing the predicted flow field with detailed measurements at the interface between the rotating impeller and the stationary diffuser and volute.

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