Repairing interference and clearance issues between elements

After you use the Interference Check command to check your model for areas in which different layers of elements interfere with each other, you can use options in the Interference Check Navigator dialog box to:

• Have the software try to automatically fix element penetrations by moving nodes.

• Manually repair penetrations or intersections by moving nodes.

With a FEM file active, you can use Interference Check Navigator options to directly move nodes because FEM files contain all meshes, elements, and nodes. With an assembly FEM or Simulation file active, you cannot directly move nodes because they are simply occurrences of the nodes in the FEM file. When you use Interference Check Navigator options to move nodes with an assembly FEM or Simulation file active, the software creates overrides for the node locations and stores them in the Override Container underneath the FEM file in the Simulation Navigator.

Node location overrides stored in the Simulation Navigator

To return nodes to their original positions, right-click the Multiple Node Location Override node in the Simulation Navigator and select Delete.

Automatically repairing element penetrations

Use the Automatic Resolution dialog box to have the software move nodes on the interfering elements and on the surrounding elements, if necessary, to resolve the penetrations. To open the Automatic Resolution dialog box, right-click the Penetrations folder in the Interference Check Navigator and select Automatic Resolution.

• Use the Criterion list to control which penetrations the software should try to fix. Select All to try to resolve all penetrations identified by the Interference Check command.Select Within Limits to resolve only the penetrations that occur within a minimum and maximum penetration depth that you specify.

• Use the Meshes to Freeze option to select any meshes in which you do not want the software to move nodes.

Manually repairing element penetrations and intersections

Use the Translate Node dialog box to move selected nodes to try to resolve the penetration or intersection issues. By default, the software automatically selects all nodes on penetrating or intersecting elements. To open the Translate Node dialog box, right-click the appropriate components in the Interference Check Navigator and select Translate Nodes - Component 1 or Translate Nodes - Component 2.

• Use the Select Nodes option to add additional nodes to move, or you can deselect specific nodes. By default, the software automatically selects all interfering or penetrating nodes.

• Use the Method list to specify the method to use to move the nodes, such as along a specified vector. Depending on the method you select, you can specify additional options, such as the distance to move the nodes.

• Depending on the option that you select from the Method list, you can use the Smoothing Options to control whether the software can move nodes in the surrounding mesh during the translation process.

The software moves the nodes and then highlights the appropriate rows in the Intersections or Penetrations folders in the Interference Check Navigator to indicate that the displayed results are now out-of-date. To update the results, right-click the appropriate row and select Refresh Results.

Highlighting indicates results that are out-of-date

Where do I find it?

Application	Pre/Post
Prerequisite	A FEM, assembly FEM, or Simulation file active
Command Finder	Interference Check

Learn more

Detecting interference and clearance issues between meshes

Working with the Interference Check Navigator

Contact interference in LS-DYNA models

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Command reference

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Repairing interference and clearance issues between elements, Simcenter 3D 2021.1 Series

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