FEM Tutorial Python/ru: Difference between revisions

From FreeCAD Documentation
(Created page with "== Приложение == Повеселись!")
(Updating to match new version of source page)
 
(20 intermediate revisions by 4 users not shown)
Line 7: Line 7:
|Time= 30 minutes
|Time= 30 minutes
|Author=[http://www.freecadweb.org/wiki/index.php?title=User:Berndhahnebach Bernd]
|Author=[http://www.freecadweb.org/wiki/index.php?title=User:Berndhahnebach Bernd]
|FCVersion=0.17.9477 or above
|FCVersion=0.17.12995 or above
|Files=
|Files=
}}
}}
</div>
</div>


== Introduction ==


<div class="mw-translate-fuzzy">
== Введение ==
== Введение ==
Этот пример предназначен для демонстрации того, как Python выполняет простой анализ методом конечных элементов (FEA) во FreeCAD [[FEM_Module|FEM Module]]. Модель из [[FEM_CalculiX_Cantilever_3D]] будет взята для этого примера.
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.
</div>



[[Image:FEM_example01_pic00.jpg|700px]]
[[Image:FEM_example01_pic00.jpg|700px]]


=== Requirements ===


<div class="mw-translate-fuzzy">
=== Требования ===
=== Требования ===
* FreeCAD версия -> в соответствии с обзором учебника
* FreeCAD версия -> в соответствии с обзором учебника
Line 25: Line 29:
* 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.
* Настройка модуля FEM. Проверьте [[FEM_CalculiX_Cantilever_3D]]
* Настройка модуля FEM. Проверьте [[FEM_CalculiX_Cantilever_3D]]
</div>


== Let's start ==
== Let's start ==

=== New document and the part to analyze ===
=== New document and the part to analyze ===

{{Code|code=
{{Code|code=
# new document
# new document
Line 47: Line 54:


=== Analysis and analysis objects ===
=== Analysis and analysis objects ===

{{Code|code=
{{Code|code=
# let us create some objects
# let us create some objects
Line 87: Line 95:
analysis_object.addObject(force_constraint)
analysis_object.addObject(force_constraint)


#
}}
}}


<!-- START of FEM mesh collapsible section below. Do not erase! -->
=== FEM mesh ===
<div class="mw-collapsible mw-collapsed toccolours" style="width:750px ">
see Additional informations for how to script mesh generation with GMSH or Netgen mesh object.

=== FEM mesh (manual) ===

This section contains the FEM mesh code. Please expand it to view the contents.

'''Note:''' Check out the [[#Additional_Information|Additional Information]] section below for how to script mesh generation with GMSH or Netgen mesh object.

<div class="mw-collapsible-content">
{{Code|code=
{{Code|code=
# mesh
# mesh
Line 408: Line 423:
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)


#
# add it to the analysis
# add it to the analysis
femmesh_obj = doc.addObject('Fem::FemMeshObject', 'Box_Mesh')
femmesh_obj = doc.addObject('Fem::FemMeshObject', 'Box_Mesh')
femmesh_obj.FemMesh = femmesh
femmesh_obj.FemMesh = femmesh
analysis_object.addObject(femmesh_obj)
analysis_object.addObject(femmesh_obj)
}}


</div> <!-- END of FEM mesh collapsible section. Do not remove -->
#
</div> <!-- END of FEM mesh collapsible section. Do not remove -->

=== FEM mesh (gmsh) ===

{{Code|code=
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) ===

{{Code|code=
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 ===

{{Code|code=
{{Code|code=
# recompute
# recompute
doc.recompute()
doc.recompute()


#
###
}}
}}


=== Run the analysis ===
== Run the analysis ==

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:
# Run all processes together at once (see [[#All in one|"All in one"]] section below)
# Run processes one after the other (see [[#Step by step|"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 {{incode|fea init}}. The {{incode|init}} method of the {{incode|fea}} class will activate the analysis '''if the GUI is up'''.

Activating an analysis using Python works a follows:

{{Code|code=
{{Code|code=
# run the analysis
# activating analysis
import FemGui
import FemGui
FemGui.setActiveAnalysis(doc.Analysis)
FemGui.setActiveAnalysis(doc.Analysis)

###
}}

==== All in one ====

{{Code|code=
# run the analysis all in one
from femtools import ccxtools
fea = ccxtools.FemToolsCcx()
fea.purge_results()
fea.run()

###
}}

==== Step by step ====

{{Code|code=
# run the analysis step by step
from femtools import ccxtools
from femtools import ccxtools
fea = ccxtools.FemToolsCcx()
fea = ccxtools.FemToolsCcx()
fea.update_objects()
fea.update_objects()
fea.setup_working_dir()
fea.setup_ccx()
message = fea.check_prerequisites()
message = fea.check_prerequisites()
if not message:
if not message:
fea.reset_all()
fea.purge_results()
fea.run()
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()
fea.load_results()
else:
else:
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
print("Houston, we have a problem! {}\n".format(message)) # in python console
print("Houston, we have a problem! {}\n".format(message)) # in Python console


#
###
}}
}}


=== Show the results ===
== Show the results ==

{{Code|code=
{{Code|code=
# show some results
# show some results
Line 456: Line 537:
femmesh_obj.ViewObject.applyDisplacement(10)
femmesh_obj.ViewObject.applyDisplacement(10)


#
###
}}
}}


=== Additional Information ===
=== Additional Information ===


===== Scripting FEM mesh objects =====
==== Scripting FEM mesh objects ====

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
===== Netgen =====

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.

===== 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 ====


===== Scripting multiple analysis =====
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


===== Scripting results =====
==== Scripting results ====

===== Standard FreeCAD result object =====

See forum posts:
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=20#p148982
* 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
* http://forum.freecadweb.org/viewtopic.php?t=18415#p144028
* 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=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:
* https://forum.freecadweb.org/viewtopic.php?f=18&t=47227#p405406

==== Console mode ====

<div class="mw-translate-fuzzy">
===== Консольный режим =====
===== 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.
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.
</div>


== Appendix ==

<div class="mw-translate-fuzzy">
== Приложение ==
== Приложение ==
Повеселись!
Повеселись!
</div>



{{FEM Tools navi{{#translation:}}}}
{{clear}}
{{Userdocnavi{{#translation:}}}}
[[Category:Python Code{{#translation:}}]]

Latest revision as of 13:10, 14 April 2023

Other languages:
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:

  1. Run all processes together at once (see "All in one" section below)
  2. 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:

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:

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!