Abstract: In this paper the commercial software package CFX-4 is used with k-ε model, RNG k-ε model, Low Reynolds Number k-ε model and algebraical stress model to simulate the flow generated by multiple impellers in a cylindrical baffled tank. The equations are discretised by the finite-volume approach. The mesh is divided into two parts which are fixed to their respective frames of reference, one being stationary and the other rotating with the impeller. At the interface between these two parts the rotating mesh slides over the fixed one at each time interval. The computation proceeds simultaneously over the whole flow field and the solutions in both rotating and stationery domains are coupled at all times.The simulation results show that the algebraical stress model predictions successfully reproduce the characteristics of flow, and are in good agreement with those obtained by LDV measurement. However the flow field simulated by k-ε model and RNG k-ε model is contorted by the underlayer impeller, and showes significant variation with experimental results.