8. Some numerical simulation results

Some areas of turbomachinery are difficult to measure. Numerical simulation enables us to calculate all the parameters needed to understand internal, stationary and unsteady flow phenomena. In the case of turbomachinery, numerical simulation involves solving the averaged 2D or 3D Navier-Stokes equations. These machines are characterized by highly complex surfaces: blades, flanges, volutes (figure 8 ).

The first step in a numerical simulation is to define the computational domain and generate the mesh for the chosen domain. This step is both the most important and the most delicate. In order to reduce calculation times, the consideration of...