Abstract: A two-phase 3-D turbulence model is presented based on the two-fluid model for the simulation of gas-liquid bubbly flow in vane pumps.The model accounts for the interfacial momentum transfer terms arising from the effects of drag and virtual mass.The turbulence is modeled by an extension of the standard k-ε turbulence model which accounts for fluctuations of gas volume fractions.The discrete equations are solved using a developed two-phase SIMPLEC algorithm.The method is applied to the turbulent gas-liquid two-phase flow in a multiphase rotodynamic pump impeller in a series of cases,and the pump performance is predicted.Comparision with the experimental results showed that the numerical model is reliable in a wide range of inlet gas volume fractions.