Computational domain

This section describes the steps involved in the preparation of surfaces to create the domain. This is done with the operations- splitting, combining and renaming of the surfaces.

Pump Surfaces

Select Split/Combine Geometry or Grid in the Mesh Panel.
Select CAD Surfacepump in the Geometric Entities Panel.
Select Split Disconnected from the Operation drop-down list in the Properties Panel, click Split Disconnected.
Rename the three new CAD Surfaces pump_01, pump_02 and pump_03 as volute, rotor and inlet respectively in the Geometric Entities Panel.

Figure 6.12 - Split of CAD surfaces

Inlet Surfaces

Select CAD Surfaces inlet in the Geometric Entities Panel.
Select Split by Angle from the Operation drop-down list in the Properties Panel.
Enter 75 deg for Angle, click Split by Angle.Three new CAD Surfaces are created.
Rename CAD Surfaces inlet_01, inlet_02 and inlet_03 as inlet_wall, inlet_mgi and inlet_inlet respectively in the Geometric Entities Panel.

Figure 6.13 - Inlet surfaces

Rotor Surfaces

Select CAD Surfaces rotor in the Geometric Entities Panel.
Select Split by Angle from the Operation drop-down list in the Properties Panel.
Enter 30 deg for Angle, click Split by Angle. Twenty new CAD Surfaces are created in the Geometric Entities Panel.
Rename CAD Surfacesrotor_01, rotor_02, rotor_03 and rotor_10 as rotor_top, rotor_bot, rotor_mgi and rotor_inlet respectively.
Select the remaining CAD Surfaces, select Combine from the Operation drop-down list in the Properties Panel, click Combine.
Rename the combined CAD Surfaces as rotor_blades.

Figure 6.14 - Rotor surfaces

Volute Surfaces

Select CAD Surfaces volute in the Geometric Entities Panel.
Select Split by Angle from the Operation drop-down list in the Properties Panel.
Enter 85 deg for Angle, click Split by Angle. Seven new CAD Surfaces are created in the Geometric Entities Panel.
Rename CAD Surfaces volute_01, volute_02 and volute_05 as volute_wall, volute_mgi and volute_outlet respectively.
Select the remaining CAD Surfaces, select Combine from the Operation drop-down list in the Properties Panel, click Combine.
Rename the combined CAD Surfaces as volute_rotating_walls.

Figure 6.15 - Volute surfaces

´	Note: Splitting of the surfaces can also be done by mouse selection using the Split by Mouse option from the Method drop-down list in the Geometry Tab of Properties Panel.