FEM MeshGmshFromShape: Difference between revisions
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For a finite elements analysis the geometry needs to be discretized into a [[FEM_Mesh|FEM Mesh]]. This command uses |
For a finite elements analysis the geometry needs to be discretized into a [[FEM_Mesh|FEM Mesh]]. This command uses the program [https://en.wikipedia.org/wiki/Gmsh Gmsh] (which needs to be installed on the system) for calculating the mesh. |
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Gmsh is bundled with the FreeCAD installation binaries. Alternatively you can install it separately from FreeCAD and then use the menu {{MenuCommand|Edit → Preferences → FEM → Gmsh}} to set the path to the ''gmsh.exe''. |
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==Usage== <!--T:5--> |
==Usage== <!--T:5--> |
Revision as of 02:34, 22 March 2021
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FEM MeshGmshFromShape |
Menu location |
---|
Mesh → FEM mesh from shape by Gmsh |
Workbenches |
FEM |
Default shortcut |
None |
Introduced in version |
- |
See also |
FEM tutorial |
Description
For a finite elements analysis the geometry needs to be discretized into a FEM Mesh. This command uses the program Gmsh (which needs to be installed on the system) for calculating the mesh.
Gmsh is bundled with the FreeCAD installation binaries. Alternatively you can install it separately from FreeCAD and then use the menu Edit → Preferences → FEM → Gmsh to set the path to the gmsh.exe.
Usage
- Select the shape you want to analyze. For volume FEM 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 BooleanFragments command.) -- For shell and beam FEM somebody needs to fill in the details here.
- There are several ways to invoke the command:
- Press the FEM MeshGmshFromShape button.
- Select the Mesh → FEM mesh from shape by Gmsh option from the menu.
- Optionally edit the minimal and maximal element size. (Autodetection works fine unless you apply complicated boundary conditions.)
- Click the Apply button and wait for the computation of the mesh to complete
- Close the task. You now should see a new FEMMeshGMSH object in your active analysis container.
Notes
Nonpositive jacobians
- 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
- 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, Mesh, OpenSCAD, Part, PartDesign, Points, Reverse Engineering, Robot, Sketcher, Spreadsheet, Surface, TechDraw, Test Framework
- Hubs: User hub, Power users hub, Developer hub