Creating Local Mesh Sags

The Mesh Part objects set contains all user specifications relative to the Mesh. In particular, global size and sag specifications, as well as global element order specifications.

Local Mesh Sags are local specifications relative to the maximum distance between the element boundaries and the boundary of the system.

This task shows how to create a Local Mesh Sag specification on a Mesh Part.

You can use the sample00.CATAnalysis document from the samples directory for this task.

Before You Begin
Go to View -> Render Style -> Customize View and make sure the Shading, Outlines and Materials options are active in the Custom View Modes dialog box.

1. Click the Local Mesh Sag icon

.
The Local Mesh Sag dialog box is displayed.

In the case of an assembly, you will select from the specification tree the Mesh object of which you want to modify the sag (Nodes and Elements feature).

You can change the name of the Local Sag by editing the Name field.

2. Enter an element sag in the Value field.
You can use the ruler button on the right of the field to enter a distance between two supports by selecting them in sequence.

3. Select a geometry for applying a local sag.

4. Click OK to create the Local Sag.
A symbol representing the Local Sag is visualized on the support.

A Local Sag object appears in the features tree under the active Mesh Part objects set.

	You can select several geometry supports to apply the Local Sag to all simultaneously.
	To edit the Mesh Part objects set, simply right-click on the Mesh Part objects set (key 3) and select `.object -> Definition,` or double-click the Mesh Part symbol in the features tree.
	To edit the global and local characteristics of the OCTREE tetrahedron mesh, simply right-click on the OCTREE tetrahedron mesh (key 3) and select `.object -> Definition,` or double-click the OCTREE tetrahedron mesh symbol in the features tree.

You can edit the following global characteristics in the Global tab of the dialog box:

Global size

Global sag

Element type

	`Linear`
	`Parabolic`

You can further edit the following local characteristics by pressing the Local tab of the dialog box:

	`Local size`
	`Local sag`
	`Local distribution:`
	`Local imposed points`

The local sag actions described above are all accessible in this alternate way, by setting the specification and pressing the Add button.

You can apply in sequence several Local Sag specifications to the system. A separate object will be created for each specification in the features tree.

To know more about the Element Type you have to choose in the OCTREE Tetrahedron Mesh dialog box, see Linear Tetrahedron and Parabolic Tetrahedron in the Finite Element Reference Guide.