Mistreatment of small hydropower sources requires the use of small turbines that combine efficiency and economy which can suitably provide the power requirements of rural and small societies. In this context, the cross flow hydro turbines are extensively used due to their simpler in design, ease of maintenance, low initial cost. Although the cross flow hydro turbine has moderated efficiency, but it has operated at low head and discharge. Hence, the objective of the present investigation is to increase the efficiency of a cross flow hydro turbine with the geometric modification. In the present study, the numerical investigation of cross flow hydro turbine has been carried out using multi-physics finite volume solver in ANSYS FLUENT. The three dimensional unsteady simulations have been conducted using shear stress transport k-omega turbulence model. The performance of cross flow hydro turbine has been investigated …