FEM Tutorial Python/ru: Difference between revisions
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</div> |
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== Introduction == |
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<div class="mw-translate-fuzzy"> |
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== Введение == |
== Введение == |
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Этот пример предназначен для демонстрации того, как Python выполняет простой анализ методом конечных элементов (FEA) во FreeCAD [[ |
Этот пример предназначен для демонстрации того, как Python выполняет простой анализ методом конечных элементов (FEA) во FreeCAD [[FEM_Workbench|FEM Workbench]]. Модель из [[FEM_CalculiX_Cantilever_3D]] будет взята для этого примера. |
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</div> |
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[[Image:FEM_example01_pic00.jpg|700px]] |
[[Image:FEM_example01_pic00.jpg|700px]] |
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=== Requirements === |
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<div class="mw-translate-fuzzy"> |
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=== Требования === |
=== Требования === |
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* FreeCAD версия -> в соответствии с обзором учебника |
* FreeCAD версия -> в соответствии с обзором учебника |
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* Несмотря на продолжающиеся изменения в модуле FEM, рекомендуется использовать последний снимок разработки FreeCAD для анализа FEM с использованием Python. |
* Несмотря на продолжающиеся изменения в модуле FEM, рекомендуется использовать последний снимок разработки FreeCAD для анализа FEM с использованием Python. |
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* Настройка модуля FEM. Проверьте [[FEM_CalculiX_Cantilever_3D]] |
* Настройка модуля FEM. Проверьте [[FEM_CalculiX_Cantilever_3D]] |
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</div> |
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== Let's start == |
== Let's start == |
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=== New document and the part to analyze === |
=== New document and the part to analyze === |
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{{Code|code= |
{{Code|code= |
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# new document |
# new document |
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=== Analysis and analysis objects === |
=== Analysis and analysis objects === |
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{{Code|code= |
{{Code|code= |
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# let us create some objects |
# let us create some objects |
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analysis_object.addObject(force_constraint) |
analysis_object.addObject(force_constraint) |
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# |
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}} |
}} |
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<!-- START of FEM mesh collapsible section below. Do not erase! --> |
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=== FEM mesh === |
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<div class="mw-collapsible mw-collapsed toccolours" style="width:750px "> |
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see Additional informations for how to script mesh generation with GMSH or Netgen mesh object. |
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=== FEM mesh (manual) === |
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This section contains the FEM mesh code. Please expand it to view the contents. |
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'''Note:''' Check out the [[#Additional_Information|Additional Information]] section below for how to script mesh generation with GMSH or Netgen mesh object. |
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<div class="mw-collapsible-content"> |
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{{Code|code= |
{{Code|code= |
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# mesh |
# mesh |
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femmesh.addVolume([40, 9, 19, 39, 214, 105, 168, 90, 215, 169], 227) |
femmesh.addVolume([40, 9, 19, 39, 214, 105, 168, 90, 215, 169], 227) |
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# |
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# add it to the analysis |
# add it to the analysis |
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femmesh_obj = doc.addObject('Fem::FemMeshObject', 'Box_Mesh') |
femmesh_obj = doc.addObject('Fem::FemMeshObject', 'Box_Mesh') |
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femmesh_obj.FemMesh = femmesh |
femmesh_obj.FemMesh = femmesh |
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analysis_object.addObject(femmesh_obj) |
analysis_object.addObject(femmesh_obj) |
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}} |
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</div> <!-- END of FEM mesh collapsible section. Do not remove --> |
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# |
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</div> <!-- END of FEM mesh collapsible section. Do not remove --> |
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=== FEM mesh (gmsh) === |
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{{Code|code= |
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femmesh_obj = ObjectsFem.makeMeshGmsh(doc, box_obj.Name + "_Mesh") |
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femmesh_obj.Part = doc.Box |
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doc.recompute() |
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from femmesh.gmshtools import GmshTools as gt |
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gmsh_mesh = gt(femmesh_obj) |
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error = gmsh_mesh.create_mesh() |
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print(error) |
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analysis_object.addObject(femmesh_obj) |
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}} |
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=== FEM mesh (netgen) === |
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{{Code|code= |
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mesh = doc.addObject('Fem::FemMeshShapeNetgenObject', 'FEMMeshNetgen') |
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mesh.Shape = doc.Box |
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mesh.MaxSize = 1000 |
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mesh.Fineness = "Moderate" |
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mesh.Optimize = True |
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mesh.SecondOrder = True |
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doc.recompute() |
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analysis_object.addObject(mesh) |
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}} |
}} |
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=== Recompute === |
=== Recompute === |
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{{Code|code= |
{{Code|code= |
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# recompute |
# recompute |
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doc.recompute() |
doc.recompute() |
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# |
### |
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}} |
}} |
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== Run the analysis == |
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To run the analysis using Python, an instance of the {{incode|ccxtools}} module class {{incode|FemToolsCcx}} needs to be created. Once this instance has been created, we have two choices when running the analysis: |
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# Run all processes together at once (see [[#All in one|"All in one"]] section below) |
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# Run processes one after the other (see [[#Step by step|"Step by step"]] section below) |
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If there is only one analysis in the document and only one solver in the analysis, then no objects need to be passed on {{incode|fea init}}. The {{incode|init}} method of the {{incode|fea}} class will activate the analysis '''if the GUI is up'''. |
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Activating an analysis using Python works a follows: |
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=== Run the analysis === |
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==== Some informations ==== |
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To run the analysis by Python an instance of the ccxtools module needs to be created. With this instance all processes could be done at once or step by step. If there is only one analysis in the document and only one solver in the analysis, no objects need to be passed on fea init. The init method of the fea class will activate the analysis if the gui is up. As an aditional information, activating an analysis by Python works a follows. |
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{{Code|code= |
{{Code|code= |
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# activating analysis |
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import FemGui |
import FemGui |
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FemGui.setActiveAnalysis(doc.Analysis) |
FemGui.setActiveAnalysis(doc.Analysis) |
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# |
### |
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}} |
}} |
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==== All in one ==== |
==== All in one ==== |
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{{Code|code= |
{{Code|code= |
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# run the analysis all in one |
# run the analysis all in one |
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fea.run() |
fea.run() |
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# |
### |
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}} |
}} |
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==== Step by step ==== |
==== Step by step ==== |
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{{Code|code= |
{{Code|code= |
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# run the analysis step by step |
# run the analysis step by step |
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else: |
else: |
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FreeCAD.Console.PrintError("Houston, we have a problem! {}\n".format(message)) # in report view |
FreeCAD.Console.PrintError("Houston, we have a problem! {}\n".format(message)) # in report view |
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print("Houston, we have a problem! {}\n".format(message)) # in |
print("Houston, we have a problem! {}\n".format(message)) # in Python console |
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# |
### |
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}} |
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== Show the results == |
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}} |
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=== Show the results === |
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{{Code|code= |
{{Code|code= |
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# show some results |
# show some results |
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femmesh_obj.ViewObject.applyDisplacement(10) |
femmesh_obj.ViewObject.applyDisplacement(10) |
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# |
### |
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}} |
}} |
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=== Additional Information === |
=== Additional Information === |
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==== Scripting FEM mesh objects ==== |
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Scripting the Netgen mesh object was tried here: http://forum.freecadweb.org/viewtopic.php?f=18&t=16944#p134519 , but has some limitations. On the contrary the GMSH mesh object fully supports python scripting. See forum topic http://forum.freecadweb.org/viewtopic.php?f=18&t=20087 |
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===== Netgen ===== |
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Scripting the Netgen mesh object was attempted in the [http://forum.freecadweb.org/viewtopic.php?f=18&t=16944#p134519 "Parametrized FEM study"] (FreeCAD FEM subforum thread), but has some limitations. |
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===== GMSH ===== |
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On the contrary, the GMSH mesh object fully supports Python scripting. See the following forum posts: |
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* https://forum.freecadweb.org/viewtopic.php?f=22&t=42922#p365042 |
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* forum topic http://forum.freecadweb.org/viewtopic.php?f=18&t=20087 |
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==== Scripting multiple analysis ==== |
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===== Scripting multiple analysis ===== |
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See forum post: http://forum.freecadweb.org/viewtopic.php?f=18&t=19549#p151385 |
See forum post: http://forum.freecadweb.org/viewtopic.php?f=18&t=19549#p151385 |
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==== Scripting results ==== |
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===== Standard FreeCAD result object ===== |
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See forum posts: |
See forum posts: |
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* https://forum.freecadweb.org/viewtopic.php?f=18&t=34048&p=289519#p289519 |
* https://forum.freecadweb.org/viewtopic.php?f=18&t=34048&p=289519#p289519 → scale factor in standard result object |
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* http://forum.freecadweb.org/viewtopic.php?f=18&t=4677&start=20#p148982 |
* http://forum.freecadweb.org/viewtopic.php?f=18&t=4677&start=20#p148982 |
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* http://forum.freecadweb.org/viewtopic.php?f=18&t=4677&start=30#p149043 |
* http://forum.freecadweb.org/viewtopic.php?f=18&t=4677&start=30#p149043 |
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* http://forum.freecadweb.org/viewtopic.php?t=18415#p144028 |
* http://forum.freecadweb.org/viewtopic.php?t=18415#p144028 |
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* https://forum.freecadweb.org/viewtopic.php?f=18&t=31123&p=258761#p258761 |
* https://forum.freecadweb.org/viewtopic.php?f=18&t=31123&p=258761#p258761 → coloring just one element |
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* https://forum.freecadweb.org/viewtopic.php?f=18&t=41951&p=357687#p357685 → reset all result mesh, show colored displacement magnitude |
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===== Vtk result object ===== |
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See forum posts: |
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* https://forum.freecadweb.org/viewtopic.php?f=18&t=47227#p405406 |
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==== Console mode ==== |
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<div class="mw-translate-fuzzy"> |
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===== Консольный режим ===== |
===== Консольный режим ===== |
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Запись входного файла в режиме консоли FreeCAD (без графического интерфейса) может быть выполнена в тестовом режиме. См. Сообщение на этом форуме: https://forum.freecadweb.org/viewtopic.php?f=22&t=25852&p=208897#p208897. |
Запись входного файла в режиме консоли FreeCAD (без графического интерфейса) может быть выполнена в тестовом режиме. См. Сообщение на этом форуме: https://forum.freecadweb.org/viewtopic.php?f=22&t=25852&p=208897#p208897. |
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</div> |
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== Appendix == |
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<div class="mw-translate-fuzzy"> |
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== Приложение == |
== Приложение == |
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Повеселись! |
Повеселись! |
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</div> |
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{{FEM Tools navi{{#translation:}}}} |
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{{clear}} |
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{{Userdocnavi{{#translation:}}}} |
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[[Category:Python Code{{#translation:}}]] |
Latest revision as of 13:10, 14 April 2023
Руководство |
Тема |
---|
Finite Element Analysis |
Уровень |
Intermediates |
Время для завершения |
30 minutes |
Авторы |
Bernd |
FreeCAD версия |
0.17.12995 or above |
Примеры файлов |
Смотрите также |
None |
Introduction
Введение
Этот пример предназначен для демонстрации того, как Python выполняет простой анализ методом конечных элементов (FEA) во FreeCAD FEM Workbench. Модель из FEM_CalculiX_Cantilever_3D будет взята для этого примера.
Requirements
Требования
- FreeCAD версия -> в соответствии с обзором учебника
- Это можно проверить в меню Справка -> о FreeCAD.
- Несмотря на продолжающиеся изменения в модуле FEM, рекомендуется использовать последний снимок разработки FreeCAD для анализа FEM с использованием Python.
- Настройка модуля FEM. Проверьте FEM_CalculiX_Cantilever_3D
Let's start
New document and the part to analyze
# new document
doc = App.newDocument("Scripted_CalculiX_Cantilever3D")
# part
import Part
box_obj = doc.addObject('Part::Box', 'Box')
box_obj.Height = box_obj.Width = 1000
box_obj.Length = 8000
# see how our part looks like
import FreeCADGui
FreeCADGui.ActiveDocument.activeView().viewAxonometric()
FreeCADGui.SendMsgToActiveView("ViewFit")
#
Analysis and analysis objects
# let us create some objects
# import to create objects
import ObjectsFem
# analysis
analysis_object = ObjectsFem.makeAnalysis(doc, "Analysis")
# solver (we gone use the well tested CcxTools solver object)
solver_object = ObjectsFem.makeSolverCalculixCcxTools(doc, "CalculiX")
solver_object.GeometricalNonlinearity = 'linear'
solver_object.ThermoMechSteadyState = True
solver_object.MatrixSolverType = 'default'
solver_object.IterationsControlParameterTimeUse = False
analysis_object.addObject(solver_object)
# material
material_object = ObjectsFem.makeMaterialSolid(doc, "SolidMaterial")
mat = material_object.Material
mat['Name'] = "Steel-Generic"
mat['YoungsModulus'] = "210000 MPa"
mat['PoissonRatio'] = "0.30"
mat['Density'] = "7900 kg/m^3"
material_object.Material = mat
analysis_object.addObject(material_object)
# fixed_constraint
fixed_constraint = ObjectsFem.makeConstraintFixed(doc, "FemConstraintFixed")
fixed_constraint.References = [(doc.Box, "Face1")]
analysis_object.addObject(fixed_constraint)
# force_constraint
force_constraint = ObjectsFem.makeConstraintForce(doc, "FemConstraintForce")
force_constraint.References = [(doc.Box, "Face2")]
force_constraint.Force = 9000000.0
force_constraint.Direction = (doc.Box, ["Edge5"])
force_constraint.Reversed = True
analysis_object.addObject(force_constraint)
FEM mesh (manual)
This section contains the FEM mesh code. Please expand it to view the contents.
Note: Check out the Additional Information section below for how to script mesh generation with GMSH or Netgen mesh object.
# mesh
import Fem
femmesh = Fem.FemMesh()
# nodes
femmesh.addNode(8000.0, 1000.0, 0.0, 1)
femmesh.addNode(8000.0, 1000.0, 1000.0, 2)
femmesh.addNode(8000.0, 0.0, 0.0, 3)
femmesh.addNode(8000.0, 0.0, 1000.0, 4)
femmesh.addNode(0.0, 1000.0, 0.0, 5)
femmesh.addNode(0.0, 1000.0, 1000.0, 6)
femmesh.addNode(0.0, 0.0, 0.0, 7)
femmesh.addNode(0.0, 0.0, 1000.0, 8)
femmesh.addNode(728.0, 1000.0, 1000.0, 9)
femmesh.addNode(1456.0, 1000.0, 1000.0, 10)
femmesh.addNode(2184.0, 1000.0, 1000.0, 11)
femmesh.addNode(2912.0, 1000.0, 1000.0, 12)
femmesh.addNode(3640.0, 1000.0, 1000.0, 13)
femmesh.addNode(4368.0, 1000.0, 1000.0, 14)
femmesh.addNode(5096.0, 1000.0, 1000.0, 15)
femmesh.addNode(5824.0, 1000.0, 1000.0, 16)
femmesh.addNode(6552.0, 1000.0, 1000.0, 17)
femmesh.addNode(7280.0, 1000.0, 1000.0, 18)
femmesh.addNode(728.0, 0.0, 1000.0, 19)
femmesh.addNode(1456.0, 0.0, 1000.0, 20)
femmesh.addNode(2184.0, 0.0, 1000.0, 21)
femmesh.addNode(2912.0, 0.0, 1000.0, 22)
femmesh.addNode(3640.0, 0.0, 1000.0, 23)
femmesh.addNode(4368.0, 0.0, 1000.0, 24)
femmesh.addNode(5096.0, 0.0, 1000.0, 25)
femmesh.addNode(5824.0, 0.0, 1000.0, 26)
femmesh.addNode(6552.0, 0.0, 1000.0, 27)
femmesh.addNode(7280.0, 0.0, 1000.0, 28)
femmesh.addNode(728.0, 1000.0, 0.0, 29)
femmesh.addNode(1456.0, 1000.0, 0.0, 30)
femmesh.addNode(2184.0, 1000.0, 0.0, 31)
femmesh.addNode(2912.0, 1000.0, 0.0, 32)
femmesh.addNode(3640.0, 1000.0, 0.0, 33)
femmesh.addNode(4368.0, 1000.0, 0.0, 34)
femmesh.addNode(5096.0, 1000.0, 0.0, 35)
femmesh.addNode(5824.0, 1000.0, 0.0, 36)
femmesh.addNode(6552.0, 1000.0, 0.0, 37)
femmesh.addNode(7280.0, 1000.0, 0.0, 38)
femmesh.addNode(728.0, 0.0, 0.0, 39)
femmesh.addNode(1456.0, 0.0, 0.0, 40)
femmesh.addNode(2184.0, 0.0, 0.0, 41)
femmesh.addNode(2912.0, 0.0, 0.0, 42)
femmesh.addNode(3640.0, 0.0, 0.0, 43)
femmesh.addNode(4368.0, 0.0, 0.0, 44)
femmesh.addNode(5096.0, 0.0, 0.0, 45)
femmesh.addNode(5824.0, 0.0, 0.0, 46)
femmesh.addNode(6552.0, 0.0, 0.0, 47)
femmesh.addNode(7280.0, 0.0, 0.0, 48)
femmesh.addNode(8000.0, 500.0, 500.0, 49)
femmesh.addNode(0.0, 500.0, 500.0, 50)
femmesh.addNode(4731.99999977, 500.000001086, 499.999998599, 51)
femmesh.addNode(0.0, 500.0, 1000.0, 52)
femmesh.addNode(364.0, 1000.0, 1000.0, 53)
femmesh.addNode(1092.0, 1000.0, 1000.0, 54)
femmesh.addNode(1820.0, 1000.0, 1000.0, 55)
femmesh.addNode(2548.0, 1000.0, 1000.0, 56)
femmesh.addNode(3276.0, 1000.0, 1000.0, 57)
femmesh.addNode(4004.0, 1000.0, 1000.0, 58)
femmesh.addNode(4732.0, 1000.0, 1000.0, 59)
femmesh.addNode(5460.0, 1000.0, 1000.0, 60)
femmesh.addNode(6188.0, 1000.0, 1000.0, 61)
femmesh.addNode(6916.0, 1000.0, 1000.0, 62)
femmesh.addNode(7640.0, 1000.0, 1000.0, 63)
femmesh.addNode(8000.0, 500.0, 1000.0, 64)
femmesh.addNode(364.0, 0.0, 1000.0, 65)
femmesh.addNode(1092.0, 0.0, 1000.0, 66)
femmesh.addNode(1820.0, 0.0, 1000.0, 67)
femmesh.addNode(2548.0, 0.0, 1000.0, 68)
femmesh.addNode(3276.0, 0.0, 1000.0, 69)
femmesh.addNode(4004.0, 0.0, 1000.0, 70)
femmesh.addNode(4732.0, 0.0, 1000.0, 71)
femmesh.addNode(5460.0, 0.0, 1000.0, 72)
femmesh.addNode(6188.0, 0.0, 1000.0, 73)
femmesh.addNode(6916.0, 0.0, 1000.0, 74)
femmesh.addNode(7640.0, 0.0, 1000.0, 75)
femmesh.addNode(0.0, 500.0, 0.0, 76)
femmesh.addNode(364.0, 1000.0, 0.0, 77)
femmesh.addNode(1092.0, 1000.0, 0.0, 78)
femmesh.addNode(1820.0, 1000.0, 0.0, 79)
femmesh.addNode(2548.0, 1000.0, 0.0, 80)
femmesh.addNode(3276.0, 1000.0, 0.0, 81)
femmesh.addNode(4004.0, 1000.0, 0.0, 82)
femmesh.addNode(4732.0, 1000.0, 0.0, 83)
femmesh.addNode(5460.0, 1000.0, 0.0, 84)
femmesh.addNode(6188.0, 1000.0, 0.0, 85)
femmesh.addNode(6916.0, 1000.0, 0.0, 86)
femmesh.addNode(7640.0, 1000.0, 0.0, 87)
femmesh.addNode(8000.0, 500.0, 0.0, 88)
femmesh.addNode(364.0, 0.0, 0.0, 89)
femmesh.addNode(1092.0, 0.0, 0.0, 90)
femmesh.addNode(1820.0, 0.0, 0.0, 91)
femmesh.addNode(2548.0, 0.0, 0.0, 92)
femmesh.addNode(3276.0, 0.0, 0.0, 93)
femmesh.addNode(4004.0, 0.0, 0.0, 94)
femmesh.addNode(4732.0, 0.0, 0.0, 95)
femmesh.addNode(5460.0, 0.0, 0.0, 96)
femmesh.addNode(6188.0, 0.0, 0.0, 97)
femmesh.addNode(6916.0, 0.0, 0.0, 98)
femmesh.addNode(7640.0, 0.0, 0.0, 99)
femmesh.addNode(8000.0, 1000.0, 500.0, 100)
femmesh.addNode(0.0, 1000.0, 500.0, 101)
femmesh.addNode(8000.0, 0.0, 500.0, 102)
femmesh.addNode(0.0, 0.0, 500.0, 103)
femmesh.addNode(364.0, 500.0, 1000.0, 104)
femmesh.addNode(728.0, 500.0, 1000.0, 105)
femmesh.addNode(1092.0, 500.0, 1000.0, 106)
femmesh.addNode(1456.0, 500.0, 1000.0, 107)
femmesh.addNode(1820.0, 500.0, 1000.0, 108)
femmesh.addNode(2184.0, 500.0, 1000.0, 109)
femmesh.addNode(2548.0, 500.0, 1000.0, 110)
femmesh.addNode(3276.0, 500.0, 1000.0, 111)
femmesh.addNode(3640.0, 500.0, 1000.0, 112)
femmesh.addNode(4004.0, 500.0, 1000.0, 113)
femmesh.addNode(4368.0, 500.0, 1000.0, 114)
femmesh.addNode(4732.0, 500.0, 1000.0, 115)
femmesh.addNode(5096.0, 500.0, 1000.0, 116)
femmesh.addNode(5460.0, 500.0, 1000.0, 117)
femmesh.addNode(5824.0, 500.0, 1000.0, 118)
femmesh.addNode(6188.0, 500.0, 1000.0, 119)
femmesh.addNode(6552.0, 500.0, 1000.0, 120)
femmesh.addNode(6916.0, 500.0, 1000.0, 121)
femmesh.addNode(7640.0, 500.0, 1000.0, 122)
femmesh.addNode(2912.0, 500.0, 1000.0, 123)
femmesh.addNode(7280.0, 500.0, 1000.0, 124)
femmesh.addNode(364.0, 500.0, 0.0, 125)
femmesh.addNode(1092.0, 500.0, 0.0, 126)
femmesh.addNode(728.0, 500.0, 0.0, 127)
femmesh.addNode(1820.0, 500.0, 0.0, 128)
femmesh.addNode(1456.0, 500.0, 0.0, 129)
femmesh.addNode(2548.0, 500.0, 0.0, 130)
femmesh.addNode(2184.0, 500.0, 0.0, 131)
femmesh.addNode(3640.0, 500.0, 0.0, 132)
femmesh.addNode(3276.0, 500.0, 0.0, 133)
femmesh.addNode(4004.0, 500.0, 0.0, 134)
femmesh.addNode(5096.0, 500.0, 0.0, 135)
femmesh.addNode(4732.0, 500.0, 0.0, 136)
femmesh.addNode(5460.0, 500.0, 0.0, 137)
femmesh.addNode(6188.0, 500.0, 0.0, 138)
femmesh.addNode(5824.0, 500.0, 0.0, 139)
femmesh.addNode(6916.0, 500.0, 0.0, 140)
femmesh.addNode(6552.0, 500.0, 0.0, 141)
femmesh.addNode(7640.0, 500.0, 0.0, 142)
femmesh.addNode(2912.0, 500.0, 0.0, 143)
femmesh.addNode(4368.0, 500.0, 0.0, 144)
femmesh.addNode(7280.0, 500.0, 0.0, 145)
femmesh.addNode(364.0, 1000.0, 500.0, 146)
femmesh.addNode(728.0, 1000.0, 500.0, 147)
femmesh.addNode(1092.0, 1000.0, 500.0, 148)
femmesh.addNode(1456.0, 1000.0, 500.0, 149)
femmesh.addNode(1820.0, 1000.0, 500.0, 150)
femmesh.addNode(2184.0, 1000.0, 500.0, 151)
femmesh.addNode(2548.0, 1000.0, 500.0, 152)
femmesh.addNode(3276.0, 1000.0, 500.0, 153)
femmesh.addNode(3640.0, 1000.0, 500.0, 154)
femmesh.addNode(4004.0, 1000.0, 500.0, 155)
femmesh.addNode(4368.0, 1000.0, 500.0, 156)
femmesh.addNode(4732.0, 1000.0, 500.0, 157)
femmesh.addNode(5096.0, 1000.0, 500.0, 158)
femmesh.addNode(5460.0, 1000.0, 500.0, 159)
femmesh.addNode(5824.0, 1000.0, 500.0, 160)
femmesh.addNode(6188.0, 1000.0, 500.0, 161)
femmesh.addNode(6552.0, 1000.0, 500.0, 162)
femmesh.addNode(6916.0, 1000.0, 500.0, 163)
femmesh.addNode(7640.0, 1000.0, 500.0, 164)
femmesh.addNode(2912.0, 1000.0, 500.0, 165)
femmesh.addNode(7280.0, 1000.0, 500.0, 166)
femmesh.addNode(364.0, 0.0, 500.0, 167)
femmesh.addNode(1092.0, 0.0, 500.0, 168)
femmesh.addNode(728.0, 0.0, 500.0, 169)
femmesh.addNode(1820.0, 0.0, 500.0, 170)
femmesh.addNode(1456.0, 0.0, 500.0, 171)
femmesh.addNode(2548.0, 0.0, 500.0, 172)
femmesh.addNode(2184.0, 0.0, 500.0, 173)
femmesh.addNode(3640.0, 0.0, 500.0, 174)
femmesh.addNode(3276.0, 0.0, 500.0, 175)
femmesh.addNode(4004.0, 0.0, 500.0, 176)
femmesh.addNode(5096.0, 0.0, 500.0, 177)
femmesh.addNode(4732.0, 0.0, 500.0, 178)
femmesh.addNode(5460.0, 0.0, 500.0, 179)
femmesh.addNode(6188.0, 0.0, 500.0, 180)
femmesh.addNode(5824.0, 0.0, 500.0, 181)
femmesh.addNode(6916.0, 0.0, 500.0, 182)
femmesh.addNode(6552.0, 0.0, 500.0, 183)
femmesh.addNode(7640.0, 0.0, 500.0, 184)
femmesh.addNode(2912.0, 0.0, 500.0, 185)
femmesh.addNode(4368.0, 0.0, 500.0, 186)
femmesh.addNode(7280.0, 0.0, 500.0, 187)
femmesh.addNode(8000.0, 250.0, 250.0, 188)
femmesh.addNode(8000.0, 250.0, 750.0, 189)
femmesh.addNode(8000.0, 750.0, 750.0, 190)
femmesh.addNode(8000.0, 750.0, 250.0, 191)
femmesh.addNode(0.0, 250.0, 750.0, 192)
femmesh.addNode(0.0, 250.0, 250.0, 193)
femmesh.addNode(0.0, 750.0, 250.0, 194)
femmesh.addNode(0.0, 750.0, 750.0, 195)
femmesh.addNode(1456.0, 500.0, 500.0, 196)
femmesh.addNode(6552.0, 500.0, 500.0, 197)
femmesh.addNode(6916.0, 500.0, 500.0, 198)
femmesh.addNode(2184.0, 500.0, 500.0, 199)
femmesh.addNode(2548.0, 500.0, 500.0, 200)
femmesh.addNode(2912.0, 500.0, 500.0, 201)
femmesh.addNode(1820.0, 500.0, 500.0, 202)
femmesh.addNode(7640.0, 750.0, 250.0, 203)
femmesh.addNode(7640.0, 750.0, 750.0, 204)
femmesh.addNode(7280.0, 500.0, 500.0, 205)
femmesh.addNode(7640.0, 250.0, 250.0, 206)
femmesh.addNode(5460.0, 500.0, 500.0, 207)
femmesh.addNode(5096.0, 500.0, 500.0, 208)
femmesh.addNode(6188.0, 500.0, 500.0, 209)
femmesh.addNode(5824.0, 500.0, 500.0, 210)
femmesh.addNode(364.0, 750.0, 250.0, 211)
femmesh.addNode(364.0, 750.0, 750.0, 212)
femmesh.addNode(364.0, 250.0, 250.0, 213)
femmesh.addNode(1092.0, 500.0, 500.0, 214)
femmesh.addNode(728.0, 500.0, 500.0, 215)
femmesh.addNode(364.0, 250.0, 750.0, 216)
femmesh.addNode(4549.99999989, 250.000000543, 249.9999993, 217)
femmesh.addNode(4549.99999989, 750.000000543, 249.9999993, 218)
femmesh.addNode(4549.99999989, 750.000000543, 749.9999993, 219)
femmesh.addNode(4368.0, 500.0, 500.0, 220)
femmesh.addNode(4549.99999989, 250.000000543, 749.9999993, 221)
femmesh.addNode(4913.99999989, 250.000000543, 749.9999993, 222)
femmesh.addNode(4913.99999989, 750.000000543, 749.9999993, 223)
femmesh.addNode(3276.0, 500.0, 500.0, 224)
femmesh.addNode(3640.0, 500.0, 500.0, 225)
femmesh.addNode(4004.0, 500.0, 500.0, 226)
femmesh.addNode(4913.99999989, 750.000000543, 249.9999993, 227)
femmesh.addNode(4913.99999989, 250.000000543, 249.9999993, 228)
# elements
femmesh.addVolume([40, 19, 10, 20, 168, 106, 196, 171, 66, 107], 149)
femmesh.addVolume([10, 31, 30, 40, 150, 79, 149, 196, 128, 129], 150)
femmesh.addVolume([38, 17, 18, 47, 163, 62, 166, 140, 197, 198], 151)
femmesh.addVolume([32, 41, 11, 12, 130, 199, 152, 165, 200, 56], 152)
femmesh.addVolume([12, 32, 41, 42, 165, 130, 200, 201, 143, 92], 153)
femmesh.addVolume([42, 21, 12, 22, 172, 110, 201, 185, 68, 123], 154)
femmesh.addVolume([10, 31, 40, 11, 150, 128, 196, 55, 151, 202], 155)
femmesh.addVolume([11, 12, 41, 21, 56, 200, 199, 109, 110, 173], 156)
femmesh.addVolume([20, 41, 11, 40, 170, 199, 108, 171, 91, 202], 157)
femmesh.addVolume([20, 41, 21, 11, 170, 173, 67, 108, 199, 109], 158)
femmesh.addVolume([32, 11, 41, 31, 152, 199, 130, 80, 151, 131], 159)
femmesh.addVolume([11, 10, 20, 40, 55, 107, 108, 202, 196, 171], 160)
femmesh.addVolume([38, 17, 47, 37, 163, 197, 140, 86, 162, 141], 161)
femmesh.addVolume([38, 18, 49, 48, 166, 204, 203, 145, 205, 206], 162)
femmesh.addVolume([46, 15, 45, 36, 207, 208, 96, 139, 159, 137], 163)
femmesh.addVolume([47, 16, 46, 37, 209, 210, 97, 141, 161, 138], 164)
femmesh.addVolume([18, 4, 2, 49, 122, 64, 63, 204, 189, 190], 165)
femmesh.addVolume([18, 17, 27, 47, 62, 120, 121, 198, 197, 183], 166)
femmesh.addVolume([38, 18, 48, 47, 166, 205, 145, 140, 198, 98], 167)
femmesh.addVolume([12, 23, 42, 22, 111, 175, 201, 123, 69, 185], 168)
femmesh.addVolume([26, 47, 27, 17, 180, 183, 73, 119, 197, 120], 169)
femmesh.addVolume([50, 29, 9, 6, 211, 147, 212, 195, 146, 53], 170)
femmesh.addVolume([27, 48, 18, 47, 182, 205, 121, 183, 98, 198], 171)
femmesh.addVolume([8, 7, 39, 50, 103, 89, 167, 192, 193, 213], 172)
femmesh.addVolume([40, 9, 39, 30, 214, 215, 90, 129, 148, 126], 173)
femmesh.addVolume([42, 21, 41, 12, 172, 173, 92, 201, 110, 200], 174)
femmesh.addVolume([50, 9, 29, 39, 212, 147, 211, 213, 215, 127], 175)
femmesh.addVolume([29, 7, 50, 39, 125, 193, 211, 127, 89, 213], 176)
femmesh.addVolume([31, 11, 41, 40, 151, 199, 131, 128, 202, 91], 177)
femmesh.addVolume([47, 16, 37, 17, 209, 161, 141, 197, 61, 162], 178)
femmesh.addVolume([40, 9, 30, 10, 214, 148, 129, 196, 54, 149], 179)
femmesh.addVolume([2, 38, 49, 1, 164, 203, 190, 100, 87, 191], 180)
femmesh.addVolume([2, 38, 18, 49, 164, 166, 63, 190, 203, 204], 181)
femmesh.addVolume([48, 49, 38, 3, 206, 203, 145, 99, 188, 142], 182)
femmesh.addVolume([38, 49, 1, 3, 203, 191, 87, 142, 188, 88], 183)
femmesh.addVolume([49, 4, 3, 48, 189, 102, 188, 206, 184, 99], 184)
femmesh.addVolume([28, 48, 4, 18, 187, 184, 75, 124, 205, 122], 185)
femmesh.addVolume([49, 18, 4, 48, 204, 122, 189, 206, 205, 184], 186)
femmesh.addVolume([7, 50, 5, 29, 193, 194, 76, 125, 211, 77], 187)
femmesh.addVolume([50, 6, 5, 29, 195, 101, 194, 211, 146, 77], 188)
femmesh.addVolume([50, 9, 19, 6, 212, 105, 216, 195, 53, 104], 189)
femmesh.addVolume([50, 19, 9, 39, 216, 105, 212, 213, 169, 215], 190)
femmesh.addVolume([50, 19, 8, 6, 216, 65, 192, 195, 104, 52], 191)
femmesh.addVolume([40, 9, 10, 19, 214, 54, 196, 168, 105, 106], 192)
femmesh.addVolume([51, 44, 34, 14, 217, 144, 218, 219, 220, 156], 193)
femmesh.addVolume([51, 24, 44, 14, 221, 186, 217, 219, 114, 220], 194)
femmesh.addVolume([25, 15, 24, 51, 116, 115, 71, 222, 223, 221], 195)
femmesh.addVolume([43, 12, 32, 13, 224, 165, 133, 225, 57, 153], 196)
femmesh.addVolume([43, 12, 23, 42, 224, 111, 174, 93, 201, 175], 197)
femmesh.addVolume([43, 12, 13, 23, 224, 57, 225, 174, 111, 112], 198)
femmesh.addVolume([43, 12, 42, 32, 224, 201, 93, 133, 165, 143], 199)
femmesh.addVolume([34, 13, 14, 44, 155, 58, 156, 144, 226, 220], 200)
femmesh.addVolume([14, 24, 15, 51, 114, 115, 59, 219, 221, 223], 201)
femmesh.addVolume([23, 24, 14, 44, 70, 114, 113, 176, 186, 220], 202)
femmesh.addVolume([33, 32, 13, 43, 81, 153, 154, 132, 133, 225], 203)
femmesh.addVolume([34, 33, 13, 43, 82, 154, 155, 134, 132, 225], 204)
femmesh.addVolume([35, 14, 15, 51, 157, 59, 158, 227, 219, 223], 205)
femmesh.addVolume([25, 45, 15, 51, 177, 208, 116, 222, 228, 223], 206)
femmesh.addVolume([44, 43, 13, 23, 94, 225, 226, 176, 174, 112], 207)
femmesh.addVolume([35, 34, 14, 51, 83, 156, 157, 227, 218, 219], 208)
femmesh.addVolume([46, 15, 36, 16, 207, 159, 139, 210, 60, 160], 209)
femmesh.addVolume([36, 35, 15, 45, 84, 158, 159, 137, 135, 208], 210)
femmesh.addVolume([37, 36, 16, 46, 85, 160, 161, 138, 139, 210], 211)
femmesh.addVolume([25, 26, 16, 46, 72, 118, 117, 179, 181, 210], 212)
femmesh.addVolume([47, 16, 17, 26, 209, 61, 197, 180, 118, 119], 213)
femmesh.addVolume([47, 16, 26, 46, 209, 118, 180, 97, 210, 181], 214)
femmesh.addVolume([27, 28, 18, 48, 74, 124, 121, 182, 187, 205], 215)
femmesh.addVolume([35, 34, 51, 45, 83, 218, 227, 135, 136, 228], 216)
femmesh.addVolume([13, 14, 44, 23, 58, 220, 226, 112, 113, 176], 217)
femmesh.addVolume([44, 25, 24, 51, 178, 71, 186, 217, 222, 221], 218)
femmesh.addVolume([44, 45, 25, 51, 95, 177, 178, 217, 228, 222], 219)
femmesh.addVolume([46, 15, 16, 25, 207, 60, 210, 179, 116, 117], 220)
femmesh.addVolume([46, 15, 25, 45, 207, 116, 179, 96, 208, 177], 221)
femmesh.addVolume([50, 8, 19, 39, 192, 65, 216, 213, 167, 169], 222)
femmesh.addVolume([35, 51, 15, 45, 227, 223, 158, 135, 228, 208], 223)
femmesh.addVolume([34, 44, 43, 13, 144, 94, 134, 155, 226, 225], 224)
femmesh.addVolume([51, 44, 45, 34, 217, 95, 228, 218, 144, 136], 225)
femmesh.addVolume([9, 29, 39, 30, 147, 127, 215, 148, 78, 126], 226)
femmesh.addVolume([40, 9, 19, 39, 214, 105, 168, 90, 215, 169], 227)
# add it to the analysis
femmesh_obj = doc.addObject('Fem::FemMeshObject', 'Box_Mesh')
femmesh_obj.FemMesh = femmesh
analysis_object.addObject(femmesh_obj)
FEM mesh (gmsh)
femmesh_obj = ObjectsFem.makeMeshGmsh(doc, box_obj.Name + "_Mesh")
femmesh_obj.Part = doc.Box
doc.recompute()
from femmesh.gmshtools import GmshTools as gt
gmsh_mesh = gt(femmesh_obj)
error = gmsh_mesh.create_mesh()
print(error)
analysis_object.addObject(femmesh_obj)
FEM mesh (netgen)
mesh = doc.addObject('Fem::FemMeshShapeNetgenObject', 'FEMMeshNetgen')
mesh.Shape = doc.Box
mesh.MaxSize = 1000
mesh.Fineness = "Moderate"
mesh.Optimize = True
mesh.SecondOrder = True
doc.recompute()
analysis_object.addObject(mesh)
Recompute
# recompute
doc.recompute()
###
Run the analysis
To run the analysis using Python, an instance of the ccxtools
module class FemToolsCcx
needs to be created. Once this instance has been created, we have two choices when running the analysis:
- Run all processes together at once (see "All in one" section below)
- Run processes one after the other (see "Step by step" section below)
If there is only one analysis in the document and only one solver in the analysis, then no objects need to be passed on fea init
. The init
method of the fea
class will activate the analysis if the GUI is up.
Activating an analysis using Python works a follows:
# activating analysis
import FemGui
FemGui.setActiveAnalysis(doc.Analysis)
###
All in one
# run the analysis all in one
from femtools import ccxtools
fea = ccxtools.FemToolsCcx()
fea.purge_results()
fea.run()
###
Step by step
# run the analysis step by step
from femtools import ccxtools
fea = ccxtools.FemToolsCcx()
fea.update_objects()
fea.setup_working_dir()
fea.setup_ccx()
message = fea.check_prerequisites()
if not message:
fea.purge_results()
fea.write_inp_file()
# on error at inp file writing, the inp file path "" was returned (even if the file was written)
# if we would write the inp file anyway, we need to again set it manually
# fea.inp_file_name = '/tmp/FEMWB/FEMMeshGmsh.inp'
fea.ccx_run()
fea.load_results()
else:
FreeCAD.Console.PrintError("Houston, we have a problem! {}\n".format(message)) # in report view
print("Houston, we have a problem! {}\n".format(message)) # in Python console
###
Show the results
# show some results
for m in analysis_object.Group:
if m.isDerivedFrom('Fem::FemResultObject'):
result_object = m
break
femmesh_obj.ViewObject.setNodeDisplacementByVectors(result_object.NodeNumbers, result_object.DisplacementVectors)
femmesh_obj.ViewObject.applyDisplacement(10)
###
Additional Information
Scripting FEM mesh objects
Netgen
Scripting the Netgen mesh object was attempted in the "Parametrized FEM study" (FreeCAD FEM subforum thread), but has some limitations.
GMSH
On the contrary, the GMSH mesh object fully supports Python scripting. See the following forum posts:
- https://forum.freecadweb.org/viewtopic.php?f=22&t=42922#p365042
- forum topic http://forum.freecadweb.org/viewtopic.php?f=18&t=20087
Scripting multiple analysis
See forum post: http://forum.freecadweb.org/viewtopic.php?f=18&t=19549#p151385
Scripting results
Standard FreeCAD result object
See forum posts:
- https://forum.freecadweb.org/viewtopic.php?f=18&t=34048&p=289519#p289519 → scale factor in standard result object
- http://forum.freecadweb.org/viewtopic.php?f=18&t=4677&start=20#p148982
- http://forum.freecadweb.org/viewtopic.php?f=18&t=4677&start=30#p149043
- http://forum.freecadweb.org/viewtopic.php?t=18415#p144028
- https://forum.freecadweb.org/viewtopic.php?f=18&t=31123&p=258761#p258761 → coloring just one element
- https://forum.freecadweb.org/viewtopic.php?f=18&t=41951&p=357687#p357685 → reset all result mesh, show colored displacement magnitude
Vtk result object
See forum posts:
Console mode
Консольный режим
Запись входного файла в режиме консоли FreeCAD (без графического интерфейса) может быть выполнена в тестовом режиме. См. Сообщение на этом форуме: https://forum.freecadweb.org/viewtopic.php?f=22&t=25852&p=208897#p208897.
Appendix
Приложение
Повеселись!
- 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
- Начинающим
- Установка: Загрузка, Windows, Linux, Mac, Дополнительных компонентов, Docker, AppImage, Ubuntu Snap
- Базовая: О FreeCAD, Интерфейс, Навигация мыши, Методы выделения, Имя объекта, Настройки, Верстаки, Структура документа, Свойства, Помоги FreeCAD, Пожертвования
- Помощь: Учебники, Видео учебники
- Верстаки: Std Base, Arch, Assembly, CAM, Draft, FEM, Inspection, Mesh, OpenSCAD, Part, PartDesign, Points, Reverse Engineering, Robot, Sketcher, Spreadsheet, Surface, TechDraw, Test Framework