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[FEM] add an example for a turbulent flow

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Uwe
2023-03-17 17:30:21 +01:00
parent b9398e3fdb
commit 5dabd5dfff
3 changed files with 296 additions and 0 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_flow_turbulent_elmer_2D.py
femexamples/equation_flux_elmer.py
femexamples/equation_magnetodynamics_elmer.py
femexamples/equation_magnetodynamics_2D_elmer.py

293
src/Mod/Fem/femexamples/equation_flow_turbulent_elmer_2D.py Normal file
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@@ -0,0 +1,293 @@
# ***************************************************************************
# * 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 Placement
from FreeCAD import Rotation
from FreeCAD import Vector
import Draft
import ObjectsFem
from BOPTools import SplitFeatures
from . import manager
from .manager import get_meshname
from .manager import init_doc
def get_information():
return {
"name": "Turbulent Flow - Elmer 2D",
"meshtype": "solid",
"meshelement": "Tet10",
"constraints": ["initial pressure", "initial temperature", "initial velocity",
"temperature", "velocity"],
"solvers": ["elmer"],
"material": "fluid",
"equations": ["flow", "heat"]
}
def get_explanation(header=""):
return header + """
To run the example from Python console use:
from femexamples.equation_flow_turbulent_elmer_2D import setup
setup()
Flow and Heat 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
# the wire defining the pipe volume in 2D
p1 = Vector(400, 0, -50.000)
p2 = Vector(400, 0, -150.000)
p3 = Vector(1200, 0, -150.000)
p4 = Vector(1200, 0, 50.000)
p5 = Vector(0, 0, 50.000)
p6 = Vector(0, 0, -50.000)
wire = Draft.make_wire([p1, p2, p3, p4, p5, p6], closed=True)
wire.Label = "Wire"
# the circle defining the heating rod
pCirc = Vector(160, 0, 0)
axisCirc = Vector(1, 0, 0)
placementCircle = Placement(pCirc, Rotation(axisCirc, 90))
circle = Draft.make_circle(10, placement=placementCircle)
circle.Label = "HeatingRod"
circle.ViewObject.Visibility = False
# a link of the circle
circleLink = doc.addObject("App::Link", "Link-HeatingRod")
circleLink.LinkTransform = True
circleLink.LinkedObject = circle
# cut rod from wire to get volume of fluid
cut = doc.addObject("Part::Cut", "Cut")
cut.Base = wire
cut.Tool = circleLink
cut.ViewObject.Visibility = False
# BooleanFregments object to combine cut with rod
BooleanFragments = SplitFeatures.makeBooleanFragments(name="BooleanFragments")
BooleanFragments.Objects = [cut, circle]
# set view
doc.recompute()
if FreeCAD.GuiUp:
BooleanFragments.ViewObject.Transparency = 50
BooleanFragments.ViewObject.Document.activeView().viewFront()
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")
equation_flow = ObjectsFem.makeEquationFlow(doc, solver_obj)
equation_heat = ObjectsFem.makeEquationHeat(doc, solver_obj)
else:
FreeCAD.Console.PrintWarning(
"Unknown or unsupported solver type: {}. "
"No solver object was created.\n".format(solvertype)
)
return doc
analysis.addObject(solver_obj)
# solver settings
equation_flow.IdrsParameter = 3
equation_flow.LinearIterations = 250
equation_flow.LinearIterativeMethod = "Idrs"
equation_flow.LinearPreconditioning = "ILU1"
equation_flow.setExpression("LinearTolerance", "1e-6")
equation_flow.NonlinearIterations = 30
equation_flow.NonlinearNewtonAfterIterations = 30
equation_flow.setExpression("NonlinearTolerance", "1e-4")
equation_flow.RelaxationFactor = 0.1
equation_heat.Convection = "Computed"
equation_heat.IdrsParameter = 3
equation_heat.LinearIterations = 250
equation_heat.LinearIterativeMethod = "Idrs"
equation_heat.LinearPreconditioning = "ILU1"
equation_heat.setExpression("LinearTolerance", "1e-6")
equation_heat.NonlinearIterations = 30
equation_heat.NonlinearNewtonAfterIterations = 30
equation_heat.setExpression("NonlinearTolerance", "1e-4")
equation_heat.Priority = 5
equation_heat.RelaxationFactor = 0.1
equation_heat.Stabilize = True
# material
# fluid
material_obj = ObjectsFem.makeMaterialFluid(doc, "Material_Fluid")
mat = material_obj.Material
mat["Name"] = "Water"
mat["Density"] = "998 kg/m^3"
mat["DynamicViscosity"] = "1.003e-3 kg/m/s"
mat["ThermalConductivity"] = "0.591 W/m/K"
mat["ThermalExpansionCoefficient"] = "2.07e-4 m/m/K"
mat["SpecificHeat"] = "4182 J/kg/K"
material_obj.Material = mat
material_obj.References = [(BooleanFragments, "Face2")]
analysis.addObject(material_obj)
# tube wall
material_obj = ObjectsFem.makeMaterialSolid(doc, "Material_Wall")
mat = material_obj.Material
mat["Name"] = "Aluminum Generic"
mat["Density"] = "2700 kg/m^3"
mat["PoissonRatio"] = "0.35"
mat["ShearModulus"] = "25.0 GPa"
mat["UltimateTensileStrength"] = "310 MPa"
mat["YoungsModulus"] = "70000 MPa"
mat["ThermalConductivity"] = "237.0 W/m/K"
mat["ThermalExpansionCoefficient"] = "23.1 µm/m/K"
mat["SpecificHeat"] = "897.0 J/kg/K"
material_obj.Material = mat
material_obj.References = [(BooleanFragments, "Face1")]
analysis.addObject(material_obj)
# constraint inlet velocity
FlowVelocity_Inlet = ObjectsFem.makeConstraintFlowVelocity(doc, "FlowVelocity_Inlet")
FlowVelocity_Inlet.References = [(BooleanFragments, "Edge5")]
FlowVelocity_Inlet.NormalDirection = Vector(-1, 0, 0)
FlowVelocity_Inlet.VelocityX = 0.020
FlowVelocity_Inlet.VelocityXEnabled = True
FlowVelocity_Inlet.VelocityYEnabled = True
FlowVelocity_Inlet.VelocityZEnabled = True
analysis.addObject(FlowVelocity_Inlet)
# constraint outlet velocity
FlowVelocity_Outlet = ObjectsFem.makeConstraintFlowVelocity(doc, "FlowVelocity_Outlet")
FlowVelocity_Outlet.References = [(BooleanFragments, "Edge6")]
FlowVelocity_Outlet.NormalDirection = Vector(1, 0, 0)
FlowVelocity_Outlet.VelocityYEnabled = True
FlowVelocity_Outlet.VelocityZEnabled = True
analysis.addObject(FlowVelocity_Outlet)
# constraint wall velocity
FlowVelocity_Wall = ObjectsFem.makeConstraintFlowVelocity(doc, "FlowVelocity_Wall")
FlowVelocity_Wall.References = [
(BooleanFragments, "Edge2"),
(BooleanFragments, "Edge3"),
(BooleanFragments, "Edge4"),
(BooleanFragments, "Edge7")]
FlowVelocity_Wall.NormalDirection = Vector(0, 0, -1)
FlowVelocity_Wall.VelocityXEnabled = True
FlowVelocity_Wall.VelocityYEnabled = True
FlowVelocity_Wall.VelocityZEnabled = True
analysis.addObject(FlowVelocity_Wall)
# constraint initial velocity
FlowVelocity_Initial = ObjectsFem.makeConstraintInitialFlowVelocity(doc, "FlowVelocity_Initial")
FlowVelocity_Initial.References = [(BooleanFragments, "Face2")]
FlowVelocity_Initial.NormalDirection = Vector(0, -1, 0)
FlowVelocity_Initial.VelocityXEnabled = True
FlowVelocity_Initial.VelocityYEnabled = True
FlowVelocity_Initial.VelocityZEnabled = True
analysis.addObject(FlowVelocity_Initial)
# constraint initial temperature
Temperature_Initial = ObjectsFem.makeConstraintInitialTemperature(doc, "Temperature_Initial")
Temperature_Initial.initialTemperature = 300.0
analysis.addObject(Temperature_Initial)
# constraint wall temperature
Temperature_Wall = ObjectsFem.makeConstraintTemperature(doc, "Temperature_Wall")
Temperature_Wall.Temperature = 300.0
Temperature_Wall.NormalDirection = Vector(0, 0, -1)
Temperature_Wall.References = [
(BooleanFragments, "Edge2"),
(BooleanFragments, "Edge3"),
(BooleanFragments, "Edge4"),
(BooleanFragments, "Edge7")]
analysis.addObject(Temperature_Wall)
# constraint inlet temperature
Temperature_Inlet = ObjectsFem.makeConstraintTemperature(doc, "Temperature_Inlet")
Temperature_Inlet.Temperature = 350.0
Temperature_Inlet.NormalDirection = Vector(-1, 0, 0)
Temperature_Inlet.References = [(BooleanFragments, "Edge5")]
analysis.addObject(Temperature_Inlet)
# constraint heating rod temperature
Temperature_HeatingRod = ObjectsFem.makeConstraintTemperature(doc, "Temperature_HeatingRod")
Temperature_HeatingRod.Temperature = 373.0
Temperature_HeatingRod.NormalDirection = Vector(0, -1, 0)
Temperature_HeatingRod.References = [(BooleanFragments, "Edge1")]
analysis.addObject(Temperature_HeatingRod)
# constraint initial pressure
Pressure_Initial = ObjectsFem.makeConstraintInitialPressure(doc, "Pressure_Initial")
Pressure_Initial.Pressure = "100.0 kPa"
Pressure_Initial.NormalDirection = Vector(0, -1, 0)
Pressure_Initial.References = [(BooleanFragments, "Face2")]
analysis.addObject(Pressure_Initial)
# mesh
femmesh_obj = analysis.addObject(ObjectsFem.makeMeshGmsh(doc, get_meshname()))[0]
femmesh_obj.Part = BooleanFragments
femmesh_obj.ElementOrder = "1st"
femmesh_obj.CharacteristicLengthMax = "4 mm"
femmesh_obj.ViewObject.Visibility = False
# mesh_region
mesh_region = ObjectsFem.makeMeshRegion(doc, femmesh_obj, name="MeshRegion")
mesh_region.CharacteristicLength = "2 mm"
mesh_region.References = [
(BooleanFragments, "Edge1"),
(BooleanFragments, "Vertex2"),
(BooleanFragments, "Vertex4"),
(BooleanFragments, "Vertex6")]
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)
)
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_flow_turbulent_elmer_2D", run_solver=True)
run_example("equation_flux_elmer", run_solver=True)
run_example("equation_magnetodynamics_elmer", run_solver=True)
run_example("equation_magnetodynamics_2D_elmer.py", run_solver=True)
@@ -108,6 +109,7 @@ 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_flow_turbulent_elmer_2D")
run_example("equation_flux_elmer")
run_example("equation_magnetodynamics_elmer")
run_example("equation_magnetodynamics_2D_elmer.py")