This paper focuses on the effects of grid schemes and turbulence models on the CFD modelling of stirred tanks. The economical grid was determined by examining the dimensionless wall distance and the skewness of elements. The grid independency study ensured that the independency of numerical predictions. Also, three categories of turbulence models were compared for prediction of flow pattern. The grid sensitivity study highlighted that the quality of control volumes in the bulk and near the wall regions are significant for obtaining the consistent solutions. It was also found that for the prediction of velocity components and the turbulent quantity the RANS based models are more efficient.