To determine the appropriate cell face size for the blade surfaces, a mesh sensitivity analysis has been conducted. Four cell face size has been taken into consideration, i.e., 0.5m, 0.4m, 0.3m and 0.2m.the associated mesh size, total no of elements and calculated rotor torque is given in table 3 and figure 7. As can be seen from figure 11 and table 2, rotor torque converges at mesh size 0.3m. Further refinement of mesh size to 0.2 only obtain minor difference but it increases the computational time. Considering computational time and accuracy, the mesh size of 0.3 is deemed as an appropriate cell face size at the blade surface for CFD modeling in this study.