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[FEM] add example for flux equation

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- also fine-tune flow example
This commit is contained in:
Uwe
2023-02-21 12:32:00 +01:00
parent c06ddbef1d
commit efdbccd0b2
4 changed files with 180 additions and 13 deletions
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1
src/Mod/Fem/CMakeLists.txt
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@@ -78,6 +78,7 @@ SET(FemExamples_SRCS
femexamples/equation_electrostatics_capacitance_two_balls.py
femexamples/equation_electrostatics_electricforce_elmer_nongui6.py
femexamples/equation_flow_elmer_2D.py
femexamples/equation_flux_elmer.py
femexamples/frequency_beamsimple.py
femexamples/manager.py
femexamples/material_multiple_bendingbeam_fiveboxes.py

24
src/Mod/Fem/femexamples/equation_flow_elmer_2D.py
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@@ -40,8 +40,8 @@ def get_information():
"name": "Flow - Elmer 2D",
"meshtype": "solid",
"meshelement": "Tet10",
"constraints": ["initial pressure", "initial velocity",
"velocity", "initial temperature", "temperature"],
"constraints": ["initial pressure", "initial temperature", "initial velocity",
"temperature", "velocity"],
"solvers": ["elmer"],
"material": "fluid",
"equations": ["flow", "heat"]
@@ -119,8 +119,8 @@ def setup(doc=None, solvertype="elmer"):
# solver
if solvertype == "elmer":
solver_obj = ObjectsFem.makeSolverElmer(doc, "SolverElmer")
solver_flow = ObjectsFem.makeEquationFlow(doc, solver_obj)
solver_heat = ObjectsFem.makeEquationHeat(doc, solver_obj)
equation_flow = ObjectsFem.makeEquationFlow(doc, solver_obj)
equation_heat = ObjectsFem.makeEquationHeat(doc, solver_obj)
else:
FreeCAD.Console.PrintWarning(
"Not known or not supported solver type: {}. "
@@ -130,15 +130,13 @@ def setup(doc=None, solvertype="elmer"):
analysis.addObject(solver_obj)
# solver settings
solver_flow.Priority = 10
solver_flow.IdrsParameter = 3
solver_flow.LinearIterativeMethod = "Idrs"
solver_flow.LinearPreconditioning = "ILU1"
solver_heat.Priority = 20
solver_heat.IdrsParameter = 3
solver_heat.LinearIterativeMethod = "Idrs"
solver_heat.LinearPreconditioning = "ILU1"
solver_heat.RelaxationFactor = 0.9
equation_flow.IdrsParameter = 3
equation_flow.LinearIterativeMethod = "Idrs"
equation_flow.LinearPreconditioning = "ILU1"
equation_heat.IdrsParameter = 3
equation_heat.LinearIterativeMethod = "Idrs"
equation_heat.LinearPreconditioning = "ILU1"
equation_heat.RelaxationFactor = 0.9
# material
material_obj = ObjectsFem.makeMaterialFluid(doc, "Material_Fluid")

166
src/Mod/Fem/femexamples/equation_flux_elmer.py Normal file
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@@ -0,0 +1,166 @@
# ***************************************************************************
# * 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 Vector
import ObjectsFem
from . import manager
from .manager import get_meshname
from .manager import init_doc
def get_information():
return {
"name": "Flux - Elmer",
"meshtype": "solid",
"meshelement": "Tet10",
"constraints": ["electrostatic potential", "temperature"],
"solvers": ["elmer"],
"material": "solid",
"equations": ["electrostatic", "flux", "heat"]
}
def get_explanation(header=""):
return header + """
To run the example from Python console use:
from femexamples.equation_flux_elmer import setup
setup()
Flow and Heat equation in FreeCAD FEM-Elmer
"""
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 object
cube = doc.addObject("Part::Box", "Cube")
# set view
doc.recompute()
if FreeCAD.GuiUp:
cube.ViewObject.Transparency = 50
cube.ViewObject.Document.activeView().viewAxonometric()
cube.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")
equation_electrostatic = ObjectsFem.makeEquationElectrostatic(doc, solver_obj)
equation_heat = ObjectsFem.makeEquationHeat(doc, solver_obj)
equation_flux_potential = ObjectsFem.makeEquationFlux(doc, solver_obj)
equation_flux_temperature = ObjectsFem.makeEquationFlux(doc, solver_obj)
else:
FreeCAD.Console.PrintWarning(
"Not known or not supported solver type: {}. "
"No solver object was created.\n".format(solvertype)
)
return doc
analysis.addObject(solver_obj)
# solver settings
equation_flux_potential.Label = "Flux_Potential"
equation_flux_potential.FluxCoefficient = "None"
equation_flux_potential.FluxVariable = "Potential"
equation_flux_temperature.Label = "Flux_Temperature"
# material
material_obj = ObjectsFem.makeMaterialSolid(doc, "Graphite")
mat = material_obj.Material
mat["Name"] = "Graphite"
mat["Density"] = "1750.0 kg/m^3"
mat["PoissonRatio"] = "0.20"
mat["ThermalConductivity"] = "96 W/m/K"
mat["ThermalExpansionCoefficient"] = "8 µm/m/K"
mat["SpecificHeat"] = "720.00 J/kg/K"
mat["RelativePermittivity"] = "0.7"
mat["ElectricalConductivity"] = "2e4 S/m"
mat["RelativePermeability"] = "1.0"
material_obj.Material = mat
material_obj.References = [(cube, "Solid1")]
analysis.addObject(material_obj)
# constraint potential 1V
Potential_1V = ObjectsFem.makeConstraintElectrostaticPotential(doc, "Potential_1V")
Potential_1V.Potential = "1 V"
Potential_1V.NormalDirection = Vector(0, -1, 0)
Potential_1V.References = [(cube, "Face3")]
analysis.addObject(Potential_1V)
# constraint potential 0V
Potential_0V = ObjectsFem.makeConstraintElectrostaticPotential(doc, "Potential_0V")
Potential_0V.Potential = "0 V"
Potential_0V.NormalDirection = Vector(0, 0, 0)
Potential_0V.References = [(cube, "Face4")]
analysis.addObject(Potential_0V)
# constraint wall temperature
Temperature_300K = ObjectsFem.makeConstraintTemperature(doc, "Temperature_300K")
Temperature_300K.Temperature = 300.0
Temperature_300K.NormalDirection = Vector(-1, 0, 0)
Temperature_300K.References = [(cube, "Face1")]
analysis.addObject(Temperature_300K)
# constraint inlet temperature
Temperature_600K = ObjectsFem.makeConstraintTemperature(doc, "Temperature_600K")
Temperature_600K.Temperature = 600.0
Temperature_600K.NormalDirection = Vector(1, 0, 0)
Temperature_600K.References = [(cube, "Face2")]
analysis.addObject(Temperature_600K)
# mesh
femmesh_obj = analysis.addObject(ObjectsFem.makeMeshGmsh(doc, get_meshname()))[0]
femmesh_obj.Part = cube
femmesh_obj.CharacteristicLengthMax = "1 mm"
femmesh_obj.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)
)
doc.recompute()
return doc

2
src/Mod/Fem/femexamples/manager.py
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@@ -71,6 +71,7 @@ def run_all():
run_example("equation_electrostatics_capacitance_two_balls", run_solver=True)
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("frequency_beamsimple", run_solver=True)
run_example("material_multiple_bendingbeam_fiveboxes", run_solver=True)
run_example("material_multiple_bendingbeam_fivefaces", run_solver=True)
@@ -104,6 +105,7 @@ def setup_all():
run_example("equation_electrostatics_capacitance_two_balls")
run_example("equation_electrostatics_electricforce_elmer_nongui6")
run_example("equation_flow_elmer_2D")
run_example("equation_flux_elmer")
run_example("frequency_beamsimple")
run_example("material_multiple_bendingbeam_fiveboxes")
run_example("material_multiple_bendingbeam_fivefaces")