The level is not adjusted to a real case. The shroud boundary layer stream ribbon is scraped off the shroud boundary layer. Multiblock grid of the GAMM Francis runner. Only the grid planes attached to surfaces are shown. The outlet velocity profiles of the GAMM Francis runner.
Discrete points are measurements and continous lines are computations.
In particular, the non-axisymmetric runner inlet boundary conditions are expected to affect the dynamics of the tip vortex because of the varying angles of incidence. In the future, a more advanced coupling between the rotating and stationary parts together with transient computations will be used to include the transient effects of guide vane wakes, varying angles of incidence and the instabilities of the tip vortex. The introduction of CFD in the area of hydraulic machine research is believed to increase a detailed knowledge of the flow inside the machines and to speed up the design procedure. This requires that the experience from CFD in this area is increased, which cannot be achieved without detailed experimental investigations to be used for comparisons. With sufficient experience of CFD in the area of hydraulic machine research, CFD will definitely be used in future hydraulic machine development.