FEM FemMesh2Mesh: Difference between revisions
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(Added scale option, removed 2D example (the tool now supports both 2D and 3D FEM mesh)) |
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This tool converts surfaces of 3D elements of a selected FEM mesh to mesh. Internally it picks FEM mesh element faces which are unique (not shared by two elements) and uses them to create faces of a mesh. Optionally it allows to create a deformed mesh caused by the action of the defined forces. This is done by adding the displacement of the FEM results to the mesh nodes. |
This tool converts surfaces of 3D elements of a selected FEM mesh to mesh, or converts 2D FEM mesh to mesh. Internally it picks FEM mesh element faces which are unique (not shared by two elements) and uses them to create faces of a mesh. Optionally it allows to create a deformed mesh caused by the action of the defined forces. This is done by adding the displacement of the FEM results to the mesh nodes (scale of the displacement can be set by python). |
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Two dimensional elements from the FEM mesh are not taken into account. If you need to convert them, you can use a python script below. |
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==Usage== <!--T:4--> |
==Usage== <!--T:4--> |
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== Scripting == <!--T:13--> |
== Scripting == <!--T:13--> |
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When you use GUI, but requires displacement scale factor |
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# Select a FEM mesh object and FEM results |
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Example: Load FreeCAD's 3D FEM example from the Start Workbench and run the following code |
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# Run the following code with your scale (e.g. 5) |
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</translate> |
</translate> |
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{{Code|code= |
{{Code|code= |
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femmesh_obj = App.ActiveDocument.getObject("Result_mesh").FemMesh |
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result = App.ActiveDocument.getObject("CalculiX_static_results") |
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import femmesh.femmesh2mesh |
import femmesh.femmesh2mesh |
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out_mesh = femmesh.femmesh2mesh.femmesh_2_mesh( |
out_mesh = femmesh.femmesh2mesh.femmesh_2_mesh(FreeCAD.ActiveDocument.Mesh.FemMesh, FreeCAD.ActiveDocument.CCX_Results, 5) |
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import Mesh |
import Mesh |
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Mesh.show(Mesh.Mesh(out_mesh)) |
Mesh.show(Mesh.Mesh(out_mesh)) |
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Example controlled fully by python |
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== Converting 2D elements == <!--T:14--> |
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Select a mesh and run the following Python script: |
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</translate> |
</translate> |
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{{Code|code= |
{{Code|code= |
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from os.path import join |
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the_file = join(FreeCAD.getResourceDir(), "examples", "FemCalculixCantilever3D.FCStd") |
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fc_file = FreeCAD.openDocument(the_file) |
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fem_mesh = fc_file.getObject("Box_Mesh").FemMesh # do not remove the _ |
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result = fc_file.getObject("CCX_Results") |
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scale = 1 # displacement scale factor |
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from femmesh import femmesh2mesh |
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out_mesh = femmesh2mesh.femmesh_2_mesh(fem_mesh, result, scale) |
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import Mesh |
import Mesh |
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Mesh.show(Mesh.Mesh(out_mesh)) |
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def extend_by_triangle(i, j, k): |
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triangle = [input_mesh.getNodeById(element_nodes[i]), |
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input_mesh.getNodeById(element_nodes[j]), |
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input_mesh.getNodeById(element_nodes[k])] |
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return output_mesh.extend(triangle) |
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selection = FreeCADGui.Selection.getSelection() |
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input_mesh = App.ActiveDocument.getObject(selection[0].Name).FemMesh |
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output_mesh = [] |
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for element in input_mesh.Faces: |
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element_nodes = input_mesh.getElementNodes(element) |
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if len(element_nodes) in [3, 6]: # tria3 or tria6 (ignoring mid-nodes) |
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extend_by_triangle(0, 1, 2) |
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elif len(element_nodes) in [4, 8]: # quad4 or quad8 (ignoring mid-nodes) |
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extend_by_triangle(0, 1, 2) |
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extend_by_triangle(2, 3, 0) |
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obj = Mesh.Mesh(output_mesh) |
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Mesh.show(obj) |
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}} |
}} |
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<translate> |
<translate> |
Revision as of 19:13, 5 November 2022
FEM FemMesh2Mesh |
Menu location |
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Mesh → FEM mesh to mesh |
Workbenches |
FEM |
Default shortcut |
None |
Introduced in version |
- |
See also |
FEM tutorial |
Description
This tool converts surfaces of 3D elements of a selected FEM mesh to mesh, or converts 2D FEM mesh to mesh. Internally it picks FEM mesh element faces which are unique (not shared by two elements) and uses them to create faces of a mesh. Optionally it allows to create a deformed mesh caused by the action of the defined forces. This is done by adding the displacement of the FEM results to the mesh nodes (scale of the displacement can be set by python).
Usage
- Select a FEM mesh object.
- Optionally also select the FEM results.
- There are several ways to invoke the command:
- Press the FEM mesh to mesh button.
- Select the Mesh → FEM mesh to mesh option from the menu.
Scripting
When you use GUI, but requires displacement scale factor
- Select a FEM mesh object and FEM results
- Run the following code with your scale (e.g. 5)
import femmesh.femmesh2mesh
out_mesh = femmesh.femmesh2mesh.femmesh_2_mesh(FreeCAD.ActiveDocument.Mesh.FemMesh, FreeCAD.ActiveDocument.CCX_Results, 5)
import Mesh
Mesh.show(Mesh.Mesh(out_mesh))
Example controlled fully by python
from os.path import join
the_file = join(FreeCAD.getResourceDir(), "examples", "FemCalculixCantilever3D.FCStd")
fc_file = FreeCAD.openDocument(the_file)
fem_mesh = fc_file.getObject("Box_Mesh").FemMesh # do not remove the _
result = fc_file.getObject("CCX_Results")
scale = 1 # displacement scale factor
from femmesh import femmesh2mesh
out_mesh = femmesh2mesh.femmesh_2_mesh(fem_mesh, result, scale)
import Mesh
Mesh.show(Mesh.Mesh(out_mesh))
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, Arch, Assembly, CAM, Draft, FEM, Inspection, Mesh, OpenSCAD, Part, PartDesign, Points, Reverse Engineering, Robot, Sketcher, Spreadsheet, Start, Surface, TechDraw, Test Framework, Web
- Hubs: User hub, Power users hub, Developer hub