Computational domain

This section explains the preparation of surfaces to create the domain. This is done with the operations splitting, combining and renaming of the surfaces. The imported geometry consists of multiple separated fluid volumes as shown in Table 6.26

CAD Surfaces	Description
port	High and low pressure ports
valve1	Fluid domain in the high pressure chamber and until the spool valve surface
valve2	Fluid domain in the low pressure chamber
solid-casing_half	Solid surface of half the casing
solid-spool	Solid surface of the spool valve
solid-spring	Solid surface of the spring

Table 6.26 - CAD surfaces

Port surfaces

Select CAD Surfaces port in the Geometric Entities Panel.
Select Split/Combine Geometry or Grid in the Mesh Panel.
Select Split by Angle from the Operation drop-down list in the Properties Panel.
Enter 75 deg for Angle, click Split by Angle. Six new CAD Surfaces are created in the Geometric Entities Panel.
Rename port_03, port_04, port_05 and port_06 as port_mgi_valve2, port_mgi_valve1, port_outlet and port_inlet respectively.
Select CAD Surfaces port_01 and port_02.
Select Combine from the Operation drop-down list in the Properties Panel, click Combine and rename as port_wall.

Figure 6.530 - Split of CAD surfaces

Valve1 surfaces

Select CAD Surfaces valve1 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. Nine new CAD Surfaces are created in the Geometric Entities Panel.
Rename valve1_01, valve1_06 and valve1_02 as valve1_cylinder_o, valve1_cylinder_i and valve1_ends1 respectively.
Select CAD Surfaces valve1_03 and valve1_04.
Select Combine from the Operation drop-down list in the Properties Panel, click Combine and rename as valve1_ends2.
Select the remaining valve1 surfaces, click Combine and rename as valve1_valve.

Figure 6.531 - Valve1 surfaces

Valve2 surfaces

Select CAD Surfaces valve2 in the Geometric Entities Panel.
Select Split by Angle from the Operation drop-down list in the Properties Panel.
Enter 50 deg for Angle, click Split by Angle. Eight new CAD Surfaces are created in the Geometric Entities Panel.
Rename valve2_01 and valve2_03 as valve2_cylinder and valve2_ends respectively.
Select CAD Surfaces valve2_02 and valve2_04.
Select Combine from the Operation drop-down list in the Properties Panel, click Combine and rename as valve2_valve.
Select the remaining valve2 surfaces, click Combine and rename as valve2_mgi_valve1.

Figure 6.532 - Valve2 surfaces