Numerical Simulation of Flow through a Francis Turbine

Tarun Parashar, Bhupendra K. Gandhi, and Krishna M. Singh


CFD, rotor/stator reference frame, three phase model, Quadrature-Phase Models


Hydro-power is the major renewable source of energy in the world. In India, hydro-power contributes to around 22% of the total power generated. The available hydraulic energy is usually converted into mechanical energy through hydraulic turbine. The present work is an approach to understand the flow mechanics inside the hydraulic turbine by using Computational Fluid Dynamics. Ansys ICEM CFD is used for geometry generation and mesh generation. The whole fluid domain is divided in structured hexahedral cells and y+ is limited under 300 to capture the boundary layer phenomenon. Steady and unsteady simulations are both done in Ansys CFX using k-ε turbulence model. The steady simulation provided primary characteristics of Francis turbine including Hill chart and energetic losses in its components; while unsteady simulation provides temporal parameters of Francis turbine which are purely function of transient properties including runner dynamic behaviour as well as rotor-stator interaction.

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