FEM MeshGroup/ru

FEM mesh region

Nodes set

FEM

Описание

The FEM MeshGroup command 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.

Применение

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 FEM mesh group 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 Add button and select the geometrical entity (solid, face, edge or vertex). More such objects can be added but they have to be of the same type. The mesh group will consist of underlying mesh entities.
5. Click the OK button.

   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 change 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.
• By default, mesh groups can only be exported to .med and .unv formats. To be able to export them to the .inp format, one needs to enable the Export group data option in INP export preferences.
  • Setting the Which mesh elements to export to Highest or FEM ensures that lower order elements not used for analysis (e.g. shells in the case of analysis with solids) won't be exported.
  • To export node sets to this format, the ДанныеGroups Of Nodes property of the Gmsh mesh object must be set to true.

FEM mesh region

Nodes set

FEM

FEM

• FEM Analysis

• Materials: Solid, Fluid, Nonlinear mechanical, Reinforced (concrete); Material editor

• Element geometry: Beam (1D), Beam rotation (1D), Shell (2D), Fluid flow (1D)

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Constraints

• Electromagnetic: Electrostatic potential, Current density, Magnetization

• Fluid: Initial flow velocity, Initial pressure, Flow velocity

• Geometrical: Plane rotation, Section print, Transform

• Mechanical: Fixed, Displacement, Contact, Tie, Spring, Force, Pressure, Centrif, Self weight

• Thermal: Initial temperature, Heat flux, Temperature, Body heat source

• Overwrite Constants: Constant vacuum permittivity

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• Mesh: Mesh Netgen, Mesh GMSH, Mesh boundary layer, Mesh region, Mesh group, Nodes set, Mesh to mesh

• Solve: CalculiX Standard, Elmer, Mystran, Z88; Equations: Deformation, Elasticity, Electrostatic, Electricforce, Magnetodynamic, Magnetodynamic 2D, Flow, Flux, Heat; Solver: Solver control, Solver run

• Results: Purge, Show; Postprocessing: Apply changes, Pipeline from result, Warp filter, Scalar clip filter, Function cut filter, Region clip filter, Contours filter, Line clip filter, Stress linearization plot, Data at point clip filter, Filter function plane, Filter function sphere, Filter function cylinder, Filter function box

• Utilities: Clipping plane, Remove clipping planes, Open FEM examples; Mesh clear, Mesh display info

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• Additional: Preferences; FEM Install, FEM Mesh, FEM Solver, FEM CalculiX, FEM Concrete; FEM Element Types

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