Simulation details
In the LES predictions, the geometric parameters used are identical to
those in the PIV experiments, and two rotational speeds (N = 90
rpm and N = 120 rpm) were chosen to investigate the flow
characteristics.
Pro\E was used to create the geometry, and ICEM CFD was
used to generate non-uniformly distributed
hexahedral
cells.
Table
2 lists the grid parameters. To meet the requirements of the sliding
mesh (SM) method, the computational cells consist of two or more
subdomains with relative motion at least. Hence, a mesh with 3623012
elements was finally used for simulation. The cell sizes in the impeller
discharge region are much smaller than those in the bulk region.
Table 2. The simulation grid
parameters