FEM MeshNetgenFromShape/it

Descrizione

For a finite element analysis, the geometry needs to be discretized into a FEM Mesh. This command uses Netgen (which needs to be installed on the system) to generate the mesh. Netgen meshes are not supported by Elmer.

Depending on your operating system and installation package, Netgen might be bundled with FreeCAD or not. For further information see FEM Install.

Utilizzo

1. Select the shape you want to analyze. For a volume, this needs to be solid or compsolid. A compsolid is necessary if your part is made from multiple materials (a compsolid can be created with the Part BooleanFragments command).
2. Activate the tool in one of the following ways:
   • Press the FEM mesh from shape by Netgen button.
   • Select the Mesh → FEM mesh from shape by Netgen option from the menu.
3. Optionally, set the max/min element size (the default setting usually creates meshes that are too coarse) and element order (using the Second Order checkbox).
4. Optionally, change the Fineness to one of the predefined choices or choose UserDefined and manually edit the parameters.
5. Click the Apply button to generate the mesh. introduced in 1.0: Optionally, use the Cancel button to abort meshing if using the new Netgen implementation.
6. Click the OK button to generate the mesh and close the dialogue. You can also click the Cancel button to cancel the changes or creation of the mesh object.

Properties

• DatiMax. Size: Maximum size of the element in mm.
• DatiMin. Size: introduced in 1.0: Minimum size of the element in mm.
• DatiSecond order: Second order elements contain more nodes per element. Usually, it is enough to use rougher mesh to obtain same solution precision as with the first order elements,
  • true (default); second order elements,
  • false; first order elements.
• DatiFineness: Offers predefined levels of mesh density.
• DatiGrowth Rate: Defines how much adjacent elements can differ in size.
• DatiNb. Segs per Edge: Defines the minimum number of mesh segments per edge.
• DatiNb. Segs per Radius: Defines the minimum number of mesh segments per radius.
• DatiOptimize:
  • true (default): applies optimization algorithm to improve mesh quality
  • false