| In the recent years, Computational fluid dynamics (CFD) analysishas been used to simulate the three-dimensional turbulent flow of a cen-trifugal pump. In the paper, the calculations for a double suction pump'sflow field at the design point and at four off-design points are carried outwith commercial software code, FLUENT. The main works are as fol-lows:Firstly, after a lot of literatures were reviewed, the latest develop-ments and applications of CFD in the numerical simulation for a cen-trifugal pump were summarized. The 3D turbulent flow is simulatedbased on the continuity equation and the time-averaged Rey-nolds-Averaged-Navier-Stokes equations (RANS), the Realizable k-εturbulent model, with the finite volume method and SIMPLEC algorithmin unstructured grid and structured grid.Secondly, the processes of 3D solid modeling are introduced in de-tail, and the model is meshed by the software package, GAMBIT.Third, the steady calculations are carried out with a multiple frameof reference approach, whereby the impeller flow field is solved in a ro- tating frame and the casing in a fixed one. And its results could be used asthe unsteady calculation's initial value.Fourth, the sliding mesh technique is applied to take into account theimpeller-volute interaction in the unsteady calculation. The performancecurves for the tested pump were calculated. In additional, the internal ve-locity field, pressure field and radial forces distribution were analyzedand compared.This paper shows the numerical simulation with the CFD techniquehas proven to be a useful tool to investigate the flow field inside a cen-trifugal pump including the dynamic effects. The obtained results canprovide a theoretical basis for the optimal design.
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