FEM MeshNetgenFromShape
|
|
| Menu location |
|---|
| Mesh → FEM mesh from shape by Netgen |
| Workbenches |
| FEM |
| Default shortcut |
| None |
| Introduced in version |
| - |
| See also |
| FEM tutorial |
| Solvers |
|---|
| CalculiX, Mystran, Z88 |
Description
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) for calculating the mesh. Netgen meshes are not supported by Elmer.
Depending on your operating system and your installation package Netgen might be bundled with FreeCAD or not. For further information see FEM Install.
Usage
- Select the shape you want to analyze. For a volume, this needs to be a 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.)
- Press the
FEM mesh from shape by Netgen button, or - Select the Mesh →
FEM mesh from shape by Netgen option from the menu.
- Press the
- Optionally, change the Fineness to one of the predefined choices or choose UserDefined and manually edit the parameters. Use the Second Order checkbox to control the element order.
- Click the Apply button to generate the mesh. introduced in version 1.0: Optionally, use the Cancel button to abort meshing.
- 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
- DataMax. Size: Maximum size of the element in mm.
- DataMin. Size: introduced in version 1.0: Minimum size of the element in mm.
- DataSecond 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.
- DataFineness: Offers predefined levels of mesh density.
- DataGrowth Rate: Defines how much adjacent elements can differ in size.
- DataNb. Segs per Edge: Defines the minimum number of mesh segments per edge.
- DataNb. Segs per Radius: Defines the minimum number of mesh segments per radius.
- DataOptimize:
- true (default): applies optimization algorithm to improve mesh quality
- false
FEM
- Materials: Solid, Fluid, Nonlinear mechanical, Reinforced (concrete); Material editor
- Element geometry: Beam (1D), Beam rotation (1D), Shell (2D), Fluid flow (1D)
Constraints
- Electromagnetic: Electrostatic potential, Current density, Magnetization
- 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
- 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
- Additional: Preferences; FEM Install, FEM Mesh, FEM Solver, FEM CalculiX, FEM Concrete; FEM Element Types
User documentation
- Getting started
- Installation: Download, Windows, Linux, Mac, Additional components, Docker, AppImage, Ubuntu Snap
- Basics: About FreeCAD, Interface, Mouse navigation, Selection methods, Object name, Preferences, Workbenches, Document structure, Properties, Help FreeCAD, Donate
- Help: Tutorials, Video tutorials
- Workbenches: Std Base, Assembly, BIM, CAM, Draft, FEM, Inspection, Material, Mesh, OpenSCAD, Part, PartDesign, Points, Reverse Engineering, Robot, Sketcher, Spreadsheet, Surface, TechDraw, Test Framework
- Hubs: User hub, Power users hub, Developer hub