Steady and unsteady RANS simulation of a complete Francis turbine unit uses the SST SAS turbulence model. The simulations were run on an HPC cluster using OpenFOAM on a coarse grid. The experimental and numerical results are compared. The numerical results were compared with the experimental ones. Axial velocity at three locations in the draft tube is plotted over the line. The numerical results are observed to follow the pattern of the experimental curve with some error. Also, the turbine unit’s head, torque, and efficiency are compared with the experimental data. An efficiency error of 7.1 and 6.6% was seen because the simulations were performed on a coarse grid.