Numerical simulation of a vertical axis Francis runner and comparison with homologous testrig results

In the study described here, the commercial 3D-Navier-Stokes CFD-Solver Ansys CFX was used to investigate the flow through a Francis turbine and to compare the results with hydraulic model tests on a closed loop turbine test stand in a homologous way. In a second part of the work, transient calculations were carried out with a scale-adaptive simulation model using two equation models for turbulence from Menter [2005].