Rib detection and removal within a mesh

In a 2D mesh, you can use the Remove Ribs command to remove elements that represent ribs from the model.

Original 2D mesh containing four thin ribs.	Mesh after Remove Ribs was used to remove the elements that define the four ribs.

Removing ribs in acoustic meshing workflows

If you plan to use the Surface Wrap command when you derive an acoustic mesh from a structural mesh, you may want to first remove geometric features that are relatively small. Removing small features such as ribs:

• Simplifies the model.

• Reduces the number of elements in the model, which can decrease the required solve time.

Detecting ribs within the mesh

To detect and remove ribs, you must specify:

• The portion of your model that you want the software to search for ribs. You can select all 2D elements in the model, or you can select a subset of the elements, such as those that belong to a component within an assembly FEM or from a region within a larger part.

• The criteria that you want the software to use to determine whether a group of elements should be considered a rib.

• Whether you want the software to delete the rib elements from your model or place them in groups in the Simulation Navigator.

Within the elements that you select, the software searches for groups of elements that:

• Are bounded by free element edges.

• Have at least one non-manifold edge.

The software applies the parameters you specify in the Rib Detection group in the Remove Ribs dialog box to categorize the groups of elements as ribs. For example:

• To limit the element groups categorized as ribs to groups that contain less than a specified number of elements, use the Maximum Elements in Rib option.

• To limit the element groups categorized as ribs to groups that have an area larger than a specified value, use the Maximum Rib Area option.

Using the Rib List

When you click the Detect Ribs button, the software searches the selected elements for groups of elements that meet the defined rib criteria. If the software finds ribs, it adds them to the Rib List. The Rib List lists all ribs and the following information about each rib:

• The number of elements in each rib.

• The area of the rib.

• The percentage of nodes that lie along the edge of each rib.

When you select a rib in the Rib List, the software highlights the elements that belong to that rib in the graphics window.

Removing the ribs or placing them in groups

After you examine the ribs in the Rib List, you must decide whether you want the software to remove the elements from the model or create groups that contain the elements associated with each rib.

• Click OK or Apply to remove all ribs. The software deletes all elements associated with the ribs.

• Select the Create Groups check box and click OK or Apply to create the groups.

Tip:

If the rib removal process leaves areas with missing elements or holes, you can use the Mesh from Boundary command to fill those areas with elements. See Creating a mesh inside an existing boundary.

Where do I find it?

Application	Pre/Post
Prerequisite	A FEM file as the work part and displayed partA mesh of 2D elements
Command Finder	Remove Ribs

How do I

Reset node and element IDs

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Rib detection and removal within a mesh , Simcenter 3D 2021.1 Series

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