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[FEM] add example for magnetodynamic equation

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- also fix description of other recently added examples
This commit is contained in:
Uwe
2023-02-22 03:07:12 +01:00
parent a79b397e85
commit 35725769d9
5 changed files with 240 additions and 2 deletions
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2
src/Mod/Fem/femexamples/equation_flow_elmer_2D.py
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@@ -54,7 +54,7 @@ To run the example from Python console use:
from femexamples.equation_flow_elmer_2D import setup
setup()
Flow and Heat equation in FreeCAD FEM-Elmer
Flow and Heat equation - Elmer solver
"""

2
src/Mod/Fem/femexamples/equation_flux_elmer.py
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@@ -49,7 +49,7 @@ To run the example from Python console use:
from femexamples.equation_flux_elmer import setup
setup()
Flow and Heat equation in FreeCAD FEM-Elmer
Potential flux and heat flux - Elmer solver
"""

235
src/Mod/Fem/femexamples/equation_magnetodynamics_elmer.py Normal file
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@@ -0,0 +1,235 @@
# ***************************************************************************
# * Copyright (c) 2023 Uwe Stöhr <uwestoehr@lyx.org> *
# * *
# * This file is part of the FreeCAD CAx development system. *
# * *
# * This program is free software; you can redistribute it and/or modify *
# * it under the terms of the GNU Lesser General Public License (LGPL) *
# * as published by the Free Software Foundation; either version 2 of *
# * the License, or (at your option) any later version. *
# * for detail see the LICENCE text file. *
# * *
# * This program is distributed in the hope that it will be useful, *
# * but WITHOUT ANY WARRANTY; without even the implied warranty of *
# * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
# * GNU Library General Public License for more details. *
# * *
# * You should have received a copy of the GNU Library General Public *
# * License along with this program; if not, write to the Free Software *
# * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
# * USA *
# * *
# ***************************************************************************
import sys
import FreeCAD
from FreeCAD import Rotation
from FreeCAD import Vector
import Fem
import ObjectsFem
from BOPTools import SplitFeatures
from BasicShapes import Shapes
from . import manager
from .manager import get_meshname
from .manager import init_doc
def get_information():
return {
"name": "Magnetic Field Around Wire",
"meshtype": "solid",
"meshelement": "Tet10",
"constraints": ["electrostatic potential", "magnetization"],
"solvers": ["elmer"],
"material": "solid",
"equations": ["magnetodynamic"]
}
def get_explanation(header=""):
return header + """
To run the example from Python console use:
from femexamples.equation_magnetodynamics_elmer import setup
setup()
Magnetodynamic equation - Elmer solver
"""
def setup(doc=None, solvertype="elmer"):
# init FreeCAD document
if doc is None:
doc = init_doc()
# explanation object
# just keep the following line and change text string in get_explanation method
manager.add_explanation_obj(doc, get_explanation(manager.get_header(get_information())))
# geometric objects
# wire
Wire = doc.addObject("Part::Cylinder", "Wire")
Wire.Radius = "1 mm"
Wire.Height = "10 mm"
Wire.ViewObject.Visibility = False
# air around wire
Air = Shapes.addTube(doc, "Tube")
Air.Label = "AirObject"
Air.OuterRadius = "5 mm"
Air.InnerRadius = "1 mm"
Air.Height = "10 mm"
Air.ViewObject.Visibility = False
# BooleanFregments object to combine cut with rod
BooleanFragments = SplitFeatures.makeBooleanFragments(name="BooleanFragments")
BooleanFragments.Objects = [Wire, Air]
# set view
doc.recompute()
if FreeCAD.GuiUp:
BooleanFragments.ViewObject.Transparency = 75
BooleanFragments.ViewObject.Document.activeView().viewAxonometric()
BooleanFragments.ViewObject.Document.activeView().fitAll()
# analysis
analysis = ObjectsFem.makeAnalysis(doc, "Analysis")
if FreeCAD.GuiUp:
import FemGui
FemGui.setActiveAnalysis(analysis)
# solver
if solvertype == "elmer":
solver_obj = ObjectsFem.makeSolverElmer(doc, "SolverElmer")
eq_electrostatic = ObjectsFem.makeEquationMagnetodynamic(doc, solver_obj)
eq_electrostatic.AngularFrequency = "100 kHz"
eq_electrostatic.BiCGstablDegree = 4
eq_electrostatic.IsHarmonic = True
eq_electrostatic.LinearIterativeMethod = "BiCGStabl"
eq_electrostatic.LinearPreconditioning = "None"
else:
FreeCAD.Console.PrintWarning(
"Not known or not supported solver type: {}. "
"No solver object was created.\n".format(solvertype)
)
analysis.addObject(solver_obj)
# material
# air around the wire
material_obj = ObjectsFem.makeMaterialFluid(doc, "Air")
mat = material_obj.Material
mat["Name"] = "Air"
mat["Density"] = "1.204 kg/m^3"
mat["KinematicViscosity"] = "15.11 mm^2/s"
mat["VolumetricThermalExpansionCoefficient"] = "0.00 mm/m/K"
mat["ThermalConductivity"] = "0.02587 W/m/K"
mat["ThermalExpansionCoefficient"] = "0.00343/K"
mat["SpecificHeat"] = "1010.00 J/kg/K"
mat["ElectricalConductivity"] = "1e-12 S/m"
mat["RelativePermeability"] = "1.0"
mat["RelativePermittivity"] = "1.00059"
material_obj.Material = mat
material_obj.References = [(BooleanFragments, "Solid2")]
analysis.addObject(material_obj)
# copper wire
material_obj = ObjectsFem.makeMaterialSolid(doc, "Copper")
mat = material_obj.Material
mat["Name"] = "Copper-Generic"
mat["Density"] = "8960 kg/m^3"
mat["PoissonRatio"] = "0.343"
mat["ShearModulus"] = "46 GPa"
mat["UltimateTensileStrength"] = "210 MPa"
mat["YoungsModulus"] = "119 GPa"
mat["ThermalConductivity"] = "398 W/m/K"
mat["ThermalExpansionCoefficient"] = "16.5 µm/m/K"
mat["SpecificHeat"] = "385 J/kg/K"
mat["ElectricalConductivity"] = "59590000 S/m"
mat["RelativePermeability"] = "0.999994"
material_obj.Material = mat
material_obj.References = [(BooleanFragments, "Solid1")]
analysis.addObject(material_obj)
# axial field around the wire
AxialField = ObjectsFem.makeConstraintElectrostaticPotential(doc, "AxialField")
AxialField.References = [
(BooleanFragments, "Face4"),
(BooleanFragments, "Face5"),
(BooleanFragments, "Face6")]
AxialField.PotentialEnabled = False
AxialField.AV_im_1_Disabled = False
AxialField.AV_im_2_Disabled = False
AxialField.AV_re_1_Disabled = False
AxialField.AV_re_2_Disabled = False
analysis.addObject(AxialField)
# voltage on one end
Voltage = ObjectsFem.makeConstraintElectrostaticPotential(doc, "Voltage")
Voltage.References = [(BooleanFragments, "Face3")]
Voltage.Potential = "10.000 mV"
Voltage.AV_im_1_Disabled = False
Voltage.AV_im_2_Disabled = False
Voltage.AV_re_1_Disabled = False
Voltage.AV_re_2_Disabled = False
analysis.addObject(Voltage)
# ground on other end
Ground = ObjectsFem.makeConstraintElectrostaticPotential(doc, "Ground")
Ground.References = [(BooleanFragments, "Face2")]
Ground.Potential = "0 V"
Ground.AV_im_1_Disabled = False
Ground.AV_im_2_Disabled = False
Ground.AV_re_1_Disabled = False
Ground.AV_re_2_Disabled = False
analysis.addObject(Ground)
# magnetization
Magnetization = ObjectsFem.makeConstraintMagnetization(doc, "Magnetization")
Magnetization.References = [(BooleanFragments, "Solid1")]
Magnetization.Magnetization_re_1 = "7500.000 A/m"
Magnetization.Magnetization_re_2 = "7500.000 A/m"
Magnetization.Magnetization_re_3 = "7500.000 A/m"
Magnetization.Magnetization_re_2_Disabled = False
analysis.addObject(Magnetization)
# mesh
femmesh_obj = analysis.addObject(ObjectsFem.makeMeshGmsh(doc, get_meshname()))[0]
femmesh_obj.Part = BooleanFragments
femmesh_obj.ElementOrder = "1st"
femmesh_obj.CharacteristicLengthMax = "0.5 mm"
femmesh_obj.ViewObject.Visibility = False
# mesh_region
mesh_region = ObjectsFem.makeMeshRegion(doc, femmesh_obj, name="MeshRegion")
mesh_region.CharacteristicLength = "0.15 mm"
mesh_region.References = [(BooleanFragments, "Solid1")]
mesh_region.ViewObject.Visibility = False
# generate the mesh
from femmesh import gmshtools
gmsh_mesh = gmshtools.GmshTools(femmesh_obj, analysis)
try:
error = gmsh_mesh.create_mesh()
except Exception:
error = sys.exc_info()[1]
FreeCAD.Console.PrintError(
"Unexpected error when creating mesh: {}\n"
.format(error)
)
if error:
# try to create from existing rough mesh
from .meshes.mesh_capacitance_two_balls_tetra10 import create_nodes, create_elements
fem_mesh = Fem.FemMesh()
control = create_nodes(fem_mesh)
if not control:
FreeCAD.Console.PrintError("Error on creating nodes.\n")
control = create_elements(fem_mesh)
if not control:
FreeCAD.Console.PrintError("Error on creating elements.\n")
femmesh_obj.FemMesh = fem_mesh
doc.recompute()
return doc

2
src/Mod/Fem/femexamples/manager.py
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@@ -72,6 +72,7 @@ def run_all():
run_example("equation_electrostatics_electricforce_elmer_nongui6", run_solver=True)
run_example("equation_flow_elmer_2D", run_solver=True)
run_example("equation_flux_elmer", run_solver=True)
run_example("equation_magnetodynamics_elmer", run_solver=True)
run_example("frequency_beamsimple", run_solver=True)
run_example("material_multiple_bendingbeam_fiveboxes", run_solver=True)
run_example("material_multiple_bendingbeam_fivefaces", run_solver=True)
@@ -106,6 +107,7 @@ def setup_all():
run_example("equation_electrostatics_electricforce_elmer_nongui6")
run_example("equation_flow_elmer_2D")
run_example("equation_flux_elmer")
run_example("equation_magnetodynamics_elmer")
run_example("frequency_beamsimple")
run_example("material_multiple_bendingbeam_fiveboxes")
run_example("material_multiple_bendingbeam_fivefaces")