Abstract: Based on the numerical methodology for computational fluid dynamics, the internal flow field of a low specific speed centrifugal pump is studied. Four turbulence models, namely, the standard k ε model, the RNG k ε model, the Realizable k ε model and the Reynolds stress models (RSM) are employed respectively, and combined with the SIMPLE algorithm for calculation. The results for different turbulence models are compared with the available experimental data, for both the pump performance curves and the internal flow fields. The computational efficiency for the four models is also compared.