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Building the Mesh

This section describes the step-by-step procedure for preparing the mesh for the circumferential valve. The Valve Template Mesher is used for creating the valve mesh and the General Mesher is used for creating the mesh for the inlet and the outlet.

Inlet and Outlet Select General Mesher in the Mesh Panel. Select CAD Surfaces inlet_inlet, inlet_mgi_valve, inlet_walls, outlet_mgi_valve, outlet_outlet and outlet_walls in the Geometric Entities Panel and click Add Surfaces icon for CAD Surfaces in the Properties Panel. Enter Maximum Cell Size as 0.02, Minimum Cell Size as 0.001 and Cell Size on Surfaces as 0.01 in the Properties Panel. Click Create Mesh. A new mesh mesh is created under Built Meshes in the Geometric Entities Panel. The meshed volumes inlet and outlet are generated under Volumes.

Figure 6.575 - Inlet and Outlet mesh settings

Valve Select Valve Template Mesher in the Mesh Panel. Select Circumferential Valve for Valve Type drop-down list in the Properties Panel. Select CAD Surfaces valve_valve in the Geometric Entities Panel, click Add Surfaces icon for Valve Surfaces in the Properties Panel. Select CAD Surfaces valve_bot, valve_cylinder_in, valve_cylinder_out, valve_top and click Add Surfaces icon for Cylinder Surfaces. Select CAD Surfaces valve_end and valve_mgi_inlet. Click Add Surfaces icon for Valve End Surfaces in the Properties Panel. Enter the parameters as follows. Center of Rotation: -0.0181899, 0.022586, 0 Rotational Axis Vector: 0, 0, 1 Reference Point: -0.012, 0.0275, 0.01 Minimum Gap Size: 0.0001 Maximum Displacement: 0.01 Deform Zone Layers: 6 Click Build Circumferential Valve Mesh. The new mesh circumferential valve is created under Built Meshes in the Geometric Entities Panel. The meshed volume circumferential valve is generated under Volumes.

Figure 6.576 - Valve mesh settings

The mesh created for the fluid domain is shown below.

Figure 6.577 - Inlet and Outlet Mesh

Figure 6.578 - Cross section showing valve mesh

Create interfaces

In this section, the Mismatched Grid Interfaces (MGIs) are generated between boundaries.

The steps to create the MGIs are shown below:

1. In Geometric Entities Panel > Volumes > Boundaries, select Boundaries as shown in Table 6.31.
2. Click Connect Selected Boundaries via MGI upon selecting the required boundaries, to create the MGI entities, refer Figure 6.579.

A group display of entities can be viewed using the Group Entities by Volumes/Types icon in Geometric Entities Panel toolbar.

Connecting interfaces	Boundaries	Entity
Valve and inlet	valve_mgi_inlet and inlet_mgi_valve	MGI01
Valve and outlet	outlet_mgi_valve and valve_cylinder_out	MGI02

Table 6.31 - Creating interfaces

 

The new entities are created under Mismatched Grid Interfaces in Volumes, refer Figure 6.580

Figure 6.579 - Connecting Valve and inlet

Figure 6.580 - Created interfaces

 

´	Note:  If MGIs are created by connecting the wrong boundaries, delete the created MGIs by clicking on Delete Selected Geometric Entity icon and then recreate the MGIs.