[FEM] rewrite initial velocity constraint
- same as #8963 but for initial velocity - add an example file that demonstrates the influence of the initial velocity - some fine-tuning for the existing flow example
This commit is contained in:
Uwe
@@ -40,7 +40,7 @@ def get_information():
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"name": "Flow - Elmer 2D",
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"meshtype": "solid",
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"meshelement": "Tet10",
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"constraints": ["initial pressure", "initial temperature", "initial velocity",
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"constraints": ["initial pressure", "initial temperature",
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"temperature", "velocity"],
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"solvers": ["elmer"],
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"material": "fluid",
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@@ -179,10 +179,10 @@ def setup(doc=None, solvertype="elmer"):
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# constraint inlet velocity
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FlowVelocity_Inlet = ObjectsFem.makeConstraintFlowVelocity(doc, "FlowVelocity_Inlet")
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FlowVelocity_Inlet.References = [(BooleanFragments, "Edge5")]
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FlowVelocity_Inlet.NormalDirection = Vector(-1, 0, 0)
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FlowVelocity_Inlet.VelocityXFormula = "Variable Coordinate 2; Real MATC \"-0.01*(tx-1)*(2-tx)\""
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FlowVelocity_Inlet.VelocityXUnspecified = False
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FlowVelocity_Inlet.VelocityXHasFormula = True
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FlowVelocity_Inlet.VelocityYUnspecified = False
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analysis.addObject(FlowVelocity_Inlet)
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# constraint wall velocity
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@@ -192,7 +192,6 @@ def setup(doc=None, solvertype="elmer"):
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(BooleanFragments, "Edge3"),
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(BooleanFragments, "Edge4"),
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(BooleanFragments, "Edge7")]
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FlowVelocity_Wall.NormalDirection = Vector(0, -1, 0)
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FlowVelocity_Wall.VelocityXUnspecified = False
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FlowVelocity_Wall.VelocityYUnspecified = False
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analysis.addObject(FlowVelocity_Wall)
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275
src/Mod/Fem/femexamples/equation_flow_initial_elmer_2D.py
Normal file
275
src/Mod/Fem/femexamples/equation_flow_initial_elmer_2D.py
Normal file
@@ -0,0 +1,275 @@
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# ***************************************************************************
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# * Copyright (c) 2023 Uwe Stöhr <uwestoehr@lyx.org> *
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# * *
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# * This file is part of the FreeCAD CAx development system. *
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# * *
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# * This program is free software; you can redistribute it and/or modify *
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# * it under the terms of the GNU Lesser General Public License (LGPL) *
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# * as published by the Free Software Foundation; either version 2 of *
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# * the License, or (at your option) any later version. *
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# * for detail see the LICENCE text file. *
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# * *
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# * This program is distributed in the hope that it will be useful, *
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# * but WITHOUT ANY WARRANTY; without even the implied warranty of *
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# * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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# * GNU Library General Public License for more details. *
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# * *
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# * You should have received a copy of the GNU Library General Public *
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# * License along with this program; if not, write to the Free Software *
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# * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
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# * USA *
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# * *
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# ***************************************************************************
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import sys
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import FreeCAD
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from FreeCAD import Placement
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from FreeCAD import Rotation
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from FreeCAD import Vector
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import Draft
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import ObjectsFem
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from BOPTools import SplitFeatures
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from . import manager
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from .manager import get_meshname
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from .manager import init_doc
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def get_information():
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return {
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"name": "Initial Flow - Elmer 2D",
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"meshtype": "solid",
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"meshelement": "Tet10",
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"constraints": ["initial pressure", "initial temperature", "initial velocity",
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"temperature", "velocity"],
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"solvers": ["elmer"],
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"material": "fluid",
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"equations": ["flow", "heat"]
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}
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def get_explanation(header=""):
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return header + """
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To run the example from Python console use:
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from femexamples.equation_flow_initial_elmer_2D import setup
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setup()
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Flow and Heat equation with initial velocity - Elmer solver
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"""
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def setup(doc=None, solvertype="elmer"):
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# init FreeCAD document
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if doc is None:
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doc = init_doc()
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# explanation object
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# just keep the following line and change text string in get_explanation method
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manager.add_explanation_obj(doc, get_explanation(manager.get_header(get_information())))
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# geometric objects
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# the wire defining the pipe volume in 2D
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p1 = Vector(400, -50.000, 0)
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p2 = Vector(400, -150.000, 0)
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p3 = Vector(1200, -150.000, 0)
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p4 = Vector(1200, 50.000, 0)
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p5 = Vector(0, 50.000, 0)
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p6 = Vector(0, -50.000, 0)
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wire = Draft.make_wire([p1, p2, p3, p4, p5, p6], closed=True)
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wire.Label = "Wire"
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# the circle defining the heating rod
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pCirc = Vector(160, 0, 0)
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axisCirc = Vector(1, 0, 0)
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placementCircle = Placement(pCirc, Rotation(axisCirc, 0))
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circle = Draft.make_circle(10, placement=placementCircle)
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circle.Label = "HeatingRod"
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circle.ViewObject.Visibility = False
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# a link of the circle
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circleLink = doc.addObject("App::Link", "Link-HeatingRod")
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circleLink.LinkTransform = True
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circleLink.LinkedObject = circle
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# cut rod from wire to get volume of fluid
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cut = doc.addObject("Part::Cut", "Cut")
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cut.Base = wire
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cut.Tool = circleLink
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cut.ViewObject.Visibility = False
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# BooleanFregments object to combine cut with rod
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BooleanFragments = SplitFeatures.makeBooleanFragments(name="BooleanFragments")
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BooleanFragments.Objects = [cut, circle]
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# set view
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doc.recompute()
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if FreeCAD.GuiUp:
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BooleanFragments.ViewObject.Transparency = 50
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BooleanFragments.ViewObject.Document.activeView().fitAll()
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# analysis
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analysis = ObjectsFem.makeAnalysis(doc, "Analysis")
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if FreeCAD.GuiUp:
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import FemGui
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FemGui.setActiveAnalysis(analysis)
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# solver
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if solvertype == "elmer":
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solver_obj = ObjectsFem.makeSolverElmer(doc, "SolverElmer")
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solver_obj.CoordinateSystem = "Cartesian 2D"
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equation_flow = ObjectsFem.makeEquationFlow(doc, solver_obj)
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equation_heat = ObjectsFem.makeEquationHeat(doc, solver_obj)
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else:
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FreeCAD.Console.PrintWarning(
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"Unknown or unsupported solver type: {}. "
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"No solver object was created.\n".format(solvertype)
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)
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return doc
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analysis.addObject(solver_obj)
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# solver settings
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equation_flow.IdrsParameter = 3
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equation_flow.LinearIterativeMethod = "Idrs"
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equation_flow.LinearPreconditioning = "ILU1"
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equation_flow.NonlinearIterations = 20
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equation_flow.NonlinearNewtonAfterIterations = 20
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equation_flow.RelaxationFactor = 0.15
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equation_flow.Variable = "Flow Solution[Velocity:2 Pressure:1]"
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equation_heat.Convection = "Computed"
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equation_heat.IdrsParameter = 3
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equation_heat.LinearIterativeMethod = "Idrs"
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equation_heat.LinearPreconditioning = "ILU1"
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equation_heat.NonlinearIterations = 20
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equation_heat.NonlinearNewtonAfterIterations = 20
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equation_heat.Priority = 5
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equation_heat.RelaxationFactor = 0.15
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equation_heat.Stabilize = True
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# material
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# fluid
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material_obj = ObjectsFem.makeMaterialFluid(doc, "Material_Fluid")
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mat = material_obj.Material
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mat["Name"] = "Carbon dioxide"
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mat["Density"] = "1.8393 kg/m^3"
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mat["DynamicViscosity"] = "14.7e-6 kg/m/s"
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mat["ThermalConductivity"] = "0.016242 W/m/K"
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mat["ThermalExpansionCoefficient"] = "0.00343 m/m/K"
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mat["SpecificHeat"] = "0.846 kJ/kg/K"
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material_obj.Material = mat
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material_obj.References = [(BooleanFragments, "Face2")]
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analysis.addObject(material_obj)
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# tube wall
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material_obj = ObjectsFem.makeMaterialSolid(doc, "Material_Wall")
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mat = material_obj.Material
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mat["Name"] = "Aluminum Generic"
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mat["Density"] = "2700 kg/m^3"
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mat["PoissonRatio"] = "0.35"
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mat["ShearModulus"] = "25.0 GPa"
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mat["UltimateTensileStrength"] = "310 MPa"
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mat["YoungsModulus"] = "70000 MPa"
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mat["ThermalConductivity"] = "237.0 W/m/K"
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mat["ThermalExpansionCoefficient"] = "23.1 µm/m/K"
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mat["SpecificHeat"] = "897.0 J/kg/K"
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material_obj.Material = mat
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material_obj.References = [(BooleanFragments, "Face1")]
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analysis.addObject(material_obj)
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# constraint inlet velocity
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FlowVelocity_Inlet = ObjectsFem.makeConstraintFlowVelocity(doc, "FlowVelocity_Inlet")
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FlowVelocity_Inlet.References = [(BooleanFragments, "Edge5")]
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FlowVelocity_Inlet.VelocityX = "20.0 mm/s"
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FlowVelocity_Inlet.VelocityXUnspecified = False
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analysis.addObject(FlowVelocity_Inlet)
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# constraint wall velocity
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FlowVelocity_Wall = ObjectsFem.makeConstraintFlowVelocity(doc, "FlowVelocity_Wall")
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FlowVelocity_Wall.References = [
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(BooleanFragments, "Edge2"),
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(BooleanFragments, "Edge3"),
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(BooleanFragments, "Edge4"),
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(BooleanFragments, "Edge7")]
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FlowVelocity_Wall.VelocityXUnspecified = False
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FlowVelocity_Wall.VelocityYUnspecified = False
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analysis.addObject(FlowVelocity_Wall)
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# constraint initial velocity
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FlowVelocity_Initial = ObjectsFem.makeConstraintInitialFlowVelocity(doc, "FlowVelocity_Initial")
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FlowVelocity_Initial.References = [(BooleanFragments, "Face2")]
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FlowVelocity_Initial.VelocityX = "20.0 mm/s"
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FlowVelocity_Initial.VelocityY = "-20.0 mm/s"
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FlowVelocity_Initial.VelocityXUnspecified = False
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FlowVelocity_Initial.VelocityYUnspecified = False
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analysis.addObject(FlowVelocity_Initial)
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# constraint initial temperature
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Temperature_Initial = ObjectsFem.makeConstraintInitialTemperature(doc, "Temperature_Initial")
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Temperature_Initial.initialTemperature = 300.0
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analysis.addObject(Temperature_Initial)
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# constraint wall temperature
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Temperature_Wall = ObjectsFem.makeConstraintTemperature(doc, "Temperature_Wall")
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Temperature_Wall.Temperature = 300.0
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Temperature_Wall.NormalDirection = Vector(0, 0, -1)
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Temperature_Wall.References = [
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(BooleanFragments, "Edge2"),
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(BooleanFragments, "Edge3"),
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(BooleanFragments, "Edge4"),
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(BooleanFragments, "Edge7")]
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analysis.addObject(Temperature_Wall)
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# constraint inlet temperature
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Temperature_Inlet = ObjectsFem.makeConstraintTemperature(doc, "Temperature_Inlet")
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Temperature_Inlet.Temperature = 350.0
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Temperature_Inlet.NormalDirection = Vector(-1, 0, 0)
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Temperature_Inlet.References = [(BooleanFragments, "Edge5")]
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analysis.addObject(Temperature_Inlet)
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# constraint heating rod temperature
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Temperature_HeatingRod = ObjectsFem.makeConstraintTemperature(doc, "Temperature_HeatingRod")
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Temperature_HeatingRod.Temperature = 373.0
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Temperature_HeatingRod.NormalDirection = Vector(0, -1, 0)
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Temperature_HeatingRod.References = [(BooleanFragments, "Edge1")]
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analysis.addObject(Temperature_HeatingRod)
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# constraint initial pressure
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Pressure_Initial = ObjectsFem.makeConstraintInitialPressure(doc, "Pressure_Initial")
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Pressure_Initial.Pressure = "100.0 kPa"
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Pressure_Initial.NormalDirection = Vector(0, -1, 0)
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Pressure_Initial.References = [(BooleanFragments, "Face2")]
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analysis.addObject(Pressure_Initial)
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# mesh
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femmesh_obj = analysis.addObject(ObjectsFem.makeMeshGmsh(doc, get_meshname()))[0]
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femmesh_obj.Part = BooleanFragments
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femmesh_obj.ElementOrder = "1st"
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femmesh_obj.CharacteristicLengthMax = "4 mm"
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femmesh_obj.ViewObject.Visibility = False
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# mesh_region
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mesh_region = ObjectsFem.makeMeshRegion(doc, femmesh_obj, name="MeshRegion")
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mesh_region.CharacteristicLength = "2 mm"
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mesh_region.References = [
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(BooleanFragments, "Edge1"),
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(BooleanFragments, "Vertex2"),
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(BooleanFragments, "Vertex4"),
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(BooleanFragments, "Vertex6")]
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mesh_region.ViewObject.Visibility = False
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# generate the mesh
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from femmesh import gmshtools
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gmsh_mesh = gmshtools.GmshTools(femmesh_obj, analysis)
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try:
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error = gmsh_mesh.create_mesh()
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except Exception:
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error = sys.exc_info()[1]
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FreeCAD.Console.PrintError(
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"Unexpected error when creating mesh: {}\n"
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.format(error)
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)
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doc.recompute()
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return doc
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@@ -40,7 +40,7 @@ def get_information():
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"name": "Turbulent Flow - Elmer 2D",
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"meshtype": "solid",
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"meshelement": "Tet10",
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"constraints": ["initial pressure", "initial temperature", "initial velocity",
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"constraints": ["initial pressure", "initial temperature",
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"temperature", "velocity"],
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"solvers": ["elmer"],
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"material": "fluid",
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@@ -54,7 +54,7 @@ To run the example from Python console use:
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from femexamples.equation_flow_turbulent_elmer_2D import setup
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setup()
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Flow and Heat equation - Elmer solver
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Flow and Heat equation in turbulent flow - Elmer solver
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"""
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@@ -136,8 +136,8 @@ def setup(doc=None, solvertype="elmer"):
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equation_flow.setExpression("LinearTolerance", "1e-6")
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equation_flow.NonlinearIterations = 30
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equation_flow.NonlinearNewtonAfterIterations = 30
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equation_flow.setExpression("NonlinearTolerance", "1e-4")
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equation_flow.RelaxationFactor = 0.1
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equation_flow.setExpression("NonlinearTolerance", "1e-4")
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equation_flow.Variable = "Flow Solution[Velocity:2 Pressure:1]"
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equation_heat.Convection = "Computed"
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equation_heat.IdrsParameter = 3
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@@ -185,10 +185,8 @@ def setup(doc=None, solvertype="elmer"):
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# constraint inlet velocity
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FlowVelocity_Inlet = ObjectsFem.makeConstraintFlowVelocity(doc, "FlowVelocity_Inlet")
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FlowVelocity_Inlet.References = [(BooleanFragments, "Edge5")]
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FlowVelocity_Inlet.NormalDirection = Vector(-1, 0, 0)
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FlowVelocity_Inlet.VelocityX = "20.0 mm/s"
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FlowVelocity_Inlet.VelocityXUnspecified = False
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FlowVelocity_Inlet.VelocityYUnspecified = False
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analysis.addObject(FlowVelocity_Inlet)
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# constraint wall velocity
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@@ -198,7 +196,6 @@ def setup(doc=None, solvertype="elmer"):
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(BooleanFragments, "Edge3"),
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(BooleanFragments, "Edge4"),
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(BooleanFragments, "Edge7")]
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FlowVelocity_Wall.NormalDirection = Vector(0, 0, -1)
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FlowVelocity_Wall.VelocityXUnspecified = False
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FlowVelocity_Wall.VelocityYUnspecified = False
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analysis.addObject(FlowVelocity_Wall)
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@@ -71,6 +71,7 @@ def run_all():
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run_example("equation_electrostatics_capacitance_two_balls", run_solver=True)
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run_example("equation_electrostatics_electricforce_elmer_nongui6", run_solver=True)
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run_example("equation_flow_elmer_2D", run_solver=True)
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run_example("equation_flow_initial_elmer_2D", run_solver=True)
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run_example("equation_flow_turbulent_elmer_2D", run_solver=True)
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run_example("equation_flux_elmer", run_solver=True)
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run_example("equation_magnetodynamics_elmer", run_solver=True)
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@@ -109,6 +110,7 @@ def setup_all():
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run_example("equation_electrostatics_capacitance_two_balls")
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run_example("equation_electrostatics_electricforce_elmer_nongui6")
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run_example("equation_flow_elmer_2D")
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run_example("equation_flow_initial_elmer_2D")
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run_example("equation_flow_turbulent_elmer_2D")
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run_example("equation_flux_elmer")
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run_example("equation_magnetodynamics_elmer")
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