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FEM_MeshGroup.md

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  • GuiCommand: Name: FEM MeshGroup MenuLocation: Mesh -> FEM mesh group Workbenches: FEM_Workbench Shortcut: SeeAlso: FEM_tutorial

FEM MeshGroup

Description

FEM MeshGroup enables the user to create groups of Vertices, Edges, Surfaces and elements. It is useful in case of using FreeCAD as a pre-processor to export an organized and labeled mesh. The mesh is then usable by external solver codes, where mesh groups can be used more readily to set boundary conditions and attribute solver related properties. It is possible to use the FreeCAD mesh group object name or the label as the group name on export of the mesh. If the label is chosen, the user has to be mindful if special characters are used. If the mesh export format does not allow special character its fallback is to use the mesh group object name.

FEM MeshGroup therefore enables FreeCAD to be used with external solvers (or viewers such as ParaView) when they are not yet implemented with their own case-writing routine within FreeCAD.

Usage

  1. To enable the function a mesh must be first provided FEM mesh from shape by Gmsh

  2. Then select the Mesh object in the Tree view and either

    • Press the button in the FEM toolbar
    • Select the Mesh → FEM mesh group option from the drop-down menu.

  3. Select whether the group is named or labeled

    • If Name is selected, the name of the MeshGroup is used when exporting the mesh.
    • If Label is selected, the specified label name will be used when exporting the mesh.

  4. Click the OK button.

  5. Close the task.

    : Result: You now should see a new FEMMeshGroup object under the FEMMeshGMSH object in your active analysis container.

  6. Double-click on the FEMMeshGMSH parent object in your Model Tree and press Apply to force a mesh recalculation / relabeling.

  7. Close the task.

Notes

  • After the mesh has been created you can change the label property using the property editor.
  • After you changed a property, you must reopen the Gmsh dialog again and click the Apply button. (You can leave the dialog open while changing properties.)
  • You can create as many different mesh groups as needed.

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⏵ documentation index > FEM MeshGroup