# *************************************************************************** # * Copyright (c) 2023 Uwe Stöhr * # * * # * 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 Draft import ObjectsFem import Part from BOPTools import SplitFeatures from . import manager from .manager import get_meshname from .manager import init_doc def get_information(): return { "name": "Inductive heating - Elmer 2D", "meshtype": "solid", "meshelement": "Tet10", "constraints": ["current density"], "solvers": ["elmer"], "material": "solid", "equations": ["electromagnetic"] } def get_explanation(header=""): return header + """ To run the example from Python console use: from femexamples.equation_magnetodynamics_2D_elmer import setup setup() Magnetodynamic2D 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 defining the insulation area p1 = Vector(0.0, 0.0, 0.0) p2 = Vector(40.0, 0.0, 0.0) p3 = Vector(40.0, 120.0, 0.0) p4 = Vector(0.0, 120.0, 0.0) p5 = Vector(0.0, 100.0, 0.0) p6 = Vector(25.0, 100.0, 0.0) p7 = Vector(25.0, 20.0, 0.0) p8 = Vector(0.0, 20.0, 0.0) Insulation = Draft.make_wire([p1, p2, p3, p4, p5, p6, p7, p8], closed=True) Insulation.Label = "Insulation" Insulation.ViewObject.Visibility = False # wire defining the coil volume p1 = Vector(50.0, -10.0, 0.0) p2 = Vector(55.0, -10.0, 0.0) p3 = Vector(55.0, 110.0, 0.0) p4 = Vector(50.0, 110.0, 0.0) Coil = Draft.make_wire([p1, p2, p3, p4], closed=True) Coil.Label = "Coil" Coil.ViewObject.Visibility = False # wire defining the crucible area p1 = Vector(0.0, 20.0, 0.0) p2 = Vector(25.0, 20.0, 0.0) p3 = Vector(25.0, 100.0, 0.0) p4 = Vector(0.0, 100.0, 0.0) p5 = Vector(0.0, 90.0, 0.0) p6 = Vector(20.0, 90.0, 0.0) p7 = Vector(20.0, 30.0, 0.0) p8 = Vector(0.0, 30.0, 0.0) Crucible = Draft.make_wire([p1, p2, p3, p4, p5, p6, p7, p8], closed=True) Crucible.Label = "Crucible" Crucible.ViewObject.Visibility = False # wire defining the powder volume p1 = Vector(0.0, 30.0, 0.0) p2 = Vector(20.0, 30.0, 0.0) p3 = Vector(20.0, 40.0, 0.0) p4 = Vector(0.0, 40.0, 0.0) Powder = Draft.make_wire([p1, p2, p3, p4], closed=True) Powder.Label = "Powder" Powder.ViewObject.Visibility = False # a half circle defining later the air volume Air_Circle = Part.makeCircle( 140.0, Vector(0.0, 60.0, 0.0), Vector(0.0, 0.0, 1.0), -90.0, 90.0) Air_Line = Part.makeLine((0.0, -80.0, 0.0), (0.0, 200.0, 0.0)) Air_Area = doc.addObject("Part::Feature", "Air_Area") Air_Area.Shape = Part.Face([Part.Wire([Air_Circle, Air_Line])]) # a link of the Insulation InsulationLink = doc.addObject("App::Link", "Link_Insulation") InsulationLink.LinkTransform = True InsulationLink.LinkedObject = Insulation InsulationLink.ViewObject.Visibility = False # a link of the Coil CoilLink = doc.addObject("App::Link", "Link_Coil") CoilLink.LinkTransform = True CoilLink.LinkedObject = Coil CoilLink.ViewObject.Visibility = False # a link of the Crucible CrucibleLink = doc.addObject("App::Link", "Link_Crucible") CrucibleLink.LinkTransform = True CrucibleLink.LinkedObject = Crucible CrucibleLink.ViewObject.Visibility = False # a link of the Powder PowderLink = doc.addObject("App::Link", "Link_Powder") PowderLink.LinkTransform = True PowderLink.LinkedObject = Powder PowderLink.ViewObject.Visibility = False # fusion of all links Fusion = doc.addObject("Part::MultiFuse", "Fusion") Fusion.Shapes = [InsulationLink, CoilLink, CrucibleLink, PowderLink] Fusion.ViewObject.Visibility = False # cut all objects from Air wire to get volume of fluid Cut = doc.addObject("Part::Cut", "Cut_Air") Cut.Base = Air_Area Cut.Tool = Fusion Cut.ViewObject.Visibility = False # BooleanFregments object to combine cut with rod BooleanFragments = SplitFeatures.makeBooleanFragments(name="BooleanFragments") BooleanFragments.Objects = [Insulation, Coil, Crucible, Powder, Cut] # set view doc.recompute() if FreeCAD.GuiUp: BooleanFragments.ViewObject.Document.activeView().viewTop() 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") solver_obj.CoordinateSystem = "Axi Symmetric" equation_magnetodynamic2D = ObjectsFem.makeEquationMagnetodynamic2D(doc, solver_obj) equation_magnetodynamic2D.AngularFrequency = "50 kHz" equation_magnetodynamic2D.CalculateCurrentDensity = True equation_magnetodynamic2D.CalculateElectricField = True equation_magnetodynamic2D.CalculateJouleHeating = True equation_magnetodynamic2D.IsHarmonic = True else: FreeCAD.Console.PrintWarning( "Unknown or unsupported solver type: {}. " "No solver object was created.\n".format(solvertype) ) return doc analysis.addObject(solver_obj) # materials # air around the objects and inside the coil material_obj = ObjectsFem.makeMaterialFluid(doc, "Air") mat = material_obj.Material mat["Name"] = "Air" mat["Density"] = "1.204 kg/m^3" mat["ThermalConductivity"] = "0.02587 W/m/K" mat["ThermalExpansionCoefficient"] = "3.43e-3 1/K" mat["SpecificHeat"] = "1.01 kJ/kg/K" mat["ElectricalConductivity"] = "1e-12 S/m" mat["RelativePermeability"] = "1.0" mat["RelativePermittivity"] = "1.00059" material_obj.Material = mat material_obj.References = [ (BooleanFragments, "Face2"), (BooleanFragments, "Face5"), (BooleanFragments, "Face6")] analysis.addObject(material_obj) # graphite of the crucible material_obj = ObjectsFem.makeMaterialSolid(doc, "Material-Crucible") mat = material_obj.Material mat["Name"] = "Graphite" mat["ElectricalConductivity"] = "2e4 S/m" mat["RelativePermeability"] = "1.0" material_obj.Material = mat material_obj.References = [(BooleanFragments, "Face3")] analysis.addObject(material_obj) # insulation of the crucible material_obj = ObjectsFem.makeMaterialSolid(doc, "Material-Insulation") mat = material_obj.Material mat["Name"] = "Insulation" mat["ElectricalConductivity"] = "2.0e3 S/m" mat["RelativePermeability"] = "1.0" material_obj.Material = mat material_obj.References = [(BooleanFragments, "Face1")] analysis.addObject(material_obj) # material of powder material_obj = ObjectsFem.makeMaterialSolid(doc, "Material-Powder") mat = material_obj.Material mat["Name"] = "Powder" mat["ElectricalConductivity"] = "1e4 S/m" mat["RelativePermeability"] = "1.0" material_obj.Material = mat material_obj.References = [(BooleanFragments, "Face4")] analysis.addObject(material_obj) # constraint current density CurrentDensity = ObjectsFem.makeConstraintCurrentDensity(doc, "CurrentDensity") CurrentDensity.References = [(BooleanFragments, "Face2")] CurrentDensity.CurrentDensity_re_1 = "250000.000 A/m^2" CurrentDensity.CurrentDensity_re_1_Disabled = False analysis.addObject(CurrentDensity) # mesh femmesh_obj = analysis.addObject(ObjectsFem.makeMeshGmsh(doc, get_meshname()))[0] femmesh_obj.Part = BooleanFragments femmesh_obj.CharacteristicLengthMax = "3 mm" femmesh_obj.ViewObject.Visibility = False # mesh_region mesh_region = ObjectsFem.makeMeshRegion(doc, femmesh_obj, name="MeshRegion") mesh_region.CharacteristicLength = "1 mm" mesh_region.References = [ (BooleanFragments, "Face1"), (BooleanFragments, "Face2"), (BooleanFragments, "Face3"), (BooleanFragments, "Face4")] 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