Building the Mesh

This section describes the step-by-step procedure for preparing the mesh for the bearing. The Template Mesh/Surface is used to create the mesh for the shaft bearing or main bearing (mb) and connecting rod bearing (conrod). The General Mesher is used to create the mesh for the cross drill, groove and oil gallery.

Connecting rod bearing Mesh

To generate a mesh for connecting rod and shaft bearing, the Annulus option is used.

Select Template Mesh/Surface in the Mesh Panel.
Select Annulus from the Shape drop down list in the Geometry Tab of the Properties Panel.
Enter conrod for Mesh Name.
Enter the parameters as follows:
Enter the parameters as follows:
- Reference Point: 0.22515, -0.0442, 0
- 1st Point: 0.24115, -0.0442, 0
- Pie Angle: 360
- Inner Radius: 0.0235
- Outer Radius: 0.0235305
- No. of Grid in 1st Dir: 20
- No. of Grid in 2nd Dir: 3
- No. of Grid in 3rd Dir: 540
Click Build Annus Mesh. A new mesh conrod is created under Built Meshes in the Geometric Entities Panel.
The meshed volume conrod is generated under Volumes.
Rename conrodBoundariescylinder, cylinder_min, dir_max and dir_min as conrod_outer, conrod_inner, conrod_outlet_u and conrod_outlet_d respectively in the Geometric Entities Panel.

Figure 7.143 - Connecting rod mesh settings

Shaft bearing Mesh

Select Template Mesh/Surface in the Mesh Panel.
Select Annulus from the Shape drop-down list in the Geometry Tab of Properties Panel.
Enter mb for Mesh Name.
Enter the parameters as follows:
- Reference Point: 0.266, 0, 0
- 1st Point: 0.284, 0, 0
- Pie Angle: 360
- Inner Radius: 0.025
- Outer Radius: 0.0250315
- No. of Grid in 1st Dir: 20
- No. of Grid in 2nd Dir: 3
- No. of Grid in 3rd Dir: 540
Click Build Annus Mesh. The new mesh mb is created under Built Meshes in the Geometric Entities Panel.
The meshed volume mb is generated under Volumes.
Rename mbBoundariescylinder, cylinder_min, dir_max and dir_min as mb_outer, mb_inner, mb_outlet_u and mb_outlet_d respectively in the Geometric Entities Panel.

Figure 7.144 - Shaft bearing mesh settings

Crossdrill Mesh

Select General Mesher in the Mesh Panel.
Select CAD Surfaces crossdrill_mgi_conrod, crossdrill_mgi_mb and crossdrill_wall in the Geometric Entities Panel and click Add Surfaces icon for CAD Surfaces in the Properties Panel.
Enter Maximum Cell Size as 0.005, Minimum Cell Size as 5e-05 and Cell Size on Surfaces as 0.0025.
Click Create Mesh. A new mesh crossdrill is created under Built Meshes in the Geometric Entities Panel.
The meshed volumes crossdrill is generated under Volumes.

Figure 7.145 - Cross drill mesh settings

Groove Mesh

Select General Mesher in the Mesh Panel.
Select CAD Surfaces groove_mgi_mb, groove_mgi_oilgallery and groove_wall in the Geometric Entities Panel and click Add Surfaces icon for CAD Surfaces in the Properties Panel.
Enter Maximum Cell Size as 0.005, Minimum Cell Size as 0.0001 and Cell Size on Surfaces as 0.0025.
Click Create Mesh. A new mesh groove is created under Built Meshes in the Geometric Entities Panel.
The meshed volumes groove is generated under Volumes.

Figure 7.146 - Groove mesh settings

Oil Gallery Mesh

Select General Mesher in the Mesh Panel.
Select CAD Surfaces oilgallery_inlet, oilgallery_mgi_groove and oilgallery_wall in the Geometric Entities Panel and click Add Surfaces icon for CAD Surfaces in the Properties Panel.
Enter Maximum Cell Size as 0.005, Minimum Cell Size as 0.0001 and Cell Size on Surfaces as 0.0025.
Click Create Mesh. A new mesh oilgallery is created under Built Meshes in the Geometric Entities Panel.
The meshed volumes oilgallery is generated under Volumes.

Figure 7.147 - Oil gallery mesh settings

´	Note: The mesh can be edited/replaced by selecting it under Built Meshes and modify the mesh parameters in the Properties Panel. Click Create Mesh to reflect the changes.

The mesh created for the fluid domain is shown below:

Figure 7.148 - Cross drill, groove and oil gallery mesh

Figure 7.149 - Conrod and mb mesh

Figure 7.150 - Sectional view

Create interfaces

In this section, the MGIs are generated between boundaries.

The steps to create the MGIs are shown below:

Geometric Entities Panel > Volumes > Boundaries, select Boundaries as shown in Table 7.3.
Click Connect Selected Boundaries via MGI icon to create the MGI entities (see, Figure 7.151).

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
Conrod and cross drill	conrod_inner and crossdrill_mgi_conrod	MGI01
Cross drill and mb	crossdrill_mgi_mb and mb_inner	MGI02
Groove and mb	groove_mgi_mb and mb_outer	MGI03
Oil gallery and groove	oilgallery_mgi_groove and groove_mgi_oilgallery	MGI04

Table 7.3 - Creating interfaces

The new entities are created under MGI in Volumes (see, Figure 7.152).

Figure 7.151 - Connecting conrod and cross drill

Figure 7.152 - 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.