FEM: constraint centrif, add example

src/Mod/Fem/CMakeLists.txt

@@ -53,6 +53,7 @@ SET(FemExamples_SRCS
     femexamples/ccx_cantilever_nodeload.py
     femexamples/ccx_cantilever_hexa20faceload.py
     femexamples/ccx_cantilever_prescribeddisplacement.py
+    femexamples/constraint_centrif.py
     femexamples/constraint_contact_shell_shell.py
     femexamples/constraint_contact_solid_solid.py
     femexamples/constraint_section_print.py
@@ -88,6 +89,7 @@ SET(FemExampleMeshes_SRCS
     femexamples/meshes/mesh_canticcx_hexa20.py
     femexamples/meshes/mesh_canticcx_tetra10.py
     femexamples/meshes/mesh_capacitance_two_balls_tetra10.py
+    femexamples/meshes/mesh_constraint_centrif_tetra10.py
     femexamples/meshes/mesh_constraint_tie_tetra10.py
     femexamples/meshes/mesh_contact_box_halfcylinder_tetra10.py
     femexamples/meshes/mesh_contact_tube_tube_tria3.py

src/Mod/Fem/femexamples/constraint_centrif.py

@@ -0,0 +1,197 @@
+# ***************************************************************************
+# *   Copyright (c) 2021 Bernd Hahnebach <bernd@bimstatik.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 FreeCAD
+from FreeCAD import Vector as vec
+
+from BasicShapes import Shapes
+from Draft import clone
+from Part import makeLine
+
+import Fem
+import ObjectsFem
+
+from . import manager
+from .manager import get_meshname
+from .manager import init_doc
+
+
+def get_information():
+    return {
+        "name": "Constraint Centrif",
+        "meshtype": "solid",
+        "meshelement": "Tet10",
+        "constraints": ["centrif", "fixed"],
+        "solvers": ["calculix"],
+        "material": "multimaterial",
+        "equation": "mechanical"
+    }
+
+
+def get_explanation(header=""):
+    return header + """
+
+To run the example from Python console use:
+from femexamples.constraint_centrif import setup
+setup()
+
+
+See forum topic post:
+https://forum.freecadweb.org/viewtopic.php?f=18&t=57770
+
+constraint centrif, concerning CENTRIF label from ccx's *DLOAD card
+
+"""
+
+
+def setup(doc=None, solvertype="ccxtools"):
+
+    # 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
+    # ring
+    stiffener = doc.addObject("Part::Box", "Stiffener")
+    stiffener.Length = 10
+    stiffener.Width = 200
+    stiffener.Height = 10
+    stiffener.Placement.Base = (-5, -100, 0)
+    circumference = Shapes.addTube(doc, "Circumference")
+    circumference.Height = 10.0
+    circumference.InnerRadius = 97.5
+    circumference.OuterRadius = 102.5
+    doc.recompute()
+
+    fusion = doc.addObject("Part::MultiFuse", "Fusion")
+    fusion.Shapes = [stiffener, circumference]
+    doc.recompute()
+
+    centerhole = doc.addObject("Part::Cylinder", "CenterHole")
+    centerhole.Radius = 3
+    centerhole.Height = 20
+    doc.recompute()
+
+    ring_bottom = doc.addObject("Part::Cut", "RingBottom")
+    ring_bottom.Base = fusion
+    ring_bottom.Tool = centerhole
+    doc.recompute()
+
+    # standard ring
+    ring_top = clone(ring_bottom, delta=vec(0, 0, 20))
+    ring_top.Label = "RingTop"
+
+    # compound of both rings
+    geom_obj = doc.addObject("Part::Compound", "TheRingOfFire")
+    geom_obj.Links = [ring_bottom, ring_top]
+    doc.recompute()
+
+    if FreeCAD.GuiUp:
+        geom_obj.ViewObject.Document.activeView().viewAxonometric()
+        geom_obj.ViewObject.Document.activeView().fitAll()
+
+    # line for centrif axis
+    sh_axis_line = makeLine(vec(0, 0, 0), vec(0, 0, 31))
+    axis_line = doc.addObject("Part::Feature", "CentrifAxis")
+    axis_line.Shape = sh_axis_line
+    doc.recompute()
+    if FreeCAD.GuiUp:
+        axis_line.ViewObject.LineWidth = 5.0
+        axis_line.ViewObject.LineColor = (1.0, 0.0, 0.0)
+
+    # analysis
+    analysis = ObjectsFem.makeAnalysis(doc, "Analysis")
+
+    # solver
+    if solvertype == "calculix":
+        solver_obj = ObjectsFem.makeSolverCalculix(doc, "SolverCalculiX")
+    elif solvertype == "ccxtools":
+        solver_obj = ObjectsFem.makeSolverCalculixCcxTools(doc, "CalculiXccxTools")
+        solver_obj.WorkingDir = u""
+    else:
+        FreeCAD.Console.PrintWarning(
+            "Not known or not supported solver type: {}. "
+            "No solver object was created.\n".format(solvertype)
+        )
+    if solvertype == "calculix" or solvertype == "ccxtools":
+        solver_obj.AnalysisType = "static"
+        solver_obj.GeometricalNonlinearity = "linear"
+        solver_obj.ThermoMechSteadyState = False
+        solver_obj.MatrixSolverType = "default"
+        solver_obj.IterationsControlParameterTimeUse = False
+        solver_obj.SplitInputWriter = False
+    analysis.addObject(solver_obj)
+
+    # materials
+    material_obj_scotty = ObjectsFem.makeMaterialSolid(doc, "Steel_Scotty")
+    mat = material_obj_scotty.Material
+    mat["Name"] = "Steel_Scotty"
+    mat["YoungsModulus"] = "210000 MPa"
+    mat["PoissonRatio"] = "0.30"
+    mat["Density"] = "4000 kg/m^3"
+    material_obj_scotty.Material = mat
+    material_obj_scotty.References = [(ring_bottom, "Solid1")]
+    analysis.addObject(material_obj_scotty)
+
+    material_obj_std = ObjectsFem.makeMaterialSolid(doc, "Steel_Std")
+    mat = material_obj_std.Material
+    mat["Name"] = "Steel_Std"
+    mat["YoungsModulus"] = "210000 MPa"
+    mat["PoissonRatio"] = "0.30"
+    mat["Density"] = "8000 kg/m^3"
+    material_obj_std.Material = mat
+    material_obj_std.References = [(ring_top, "Solid1")]
+    analysis.addObject(material_obj_std)
+
+    # constraint fixed
+    con_fixed = ObjectsFem.makeConstraintFixed(doc, "ConstraintFixed")
+    con_fixed.References = [(geom_obj, ("Face4", "Face12"))]
+    analysis.addObject(con_fixed)
+
+    # constraint centrif
+    con_centrif = ObjectsFem.makeConstraintCentrif(doc, "ConstraintCentrif")
+    con_centrif.RotationFrequency = "100 Hz"
+    con_centrif.RotationAxis = [(axis_line, "Edge1")]
+    analysis.addObject(con_centrif)
+
+    # mesh
+    from .meshes.mesh_constraint_centrif_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 = analysis.addObject(ObjectsFem.makeMeshGmsh(doc, get_meshname()))[0]
+    femmesh_obj.FemMesh = fem_mesh
+    femmesh_obj.Part = geom_obj
+    femmesh_obj.SecondOrderLinear = False
+    femmesh_obj.CharacteristicLengthMax = "5.0 mm"
+
+    doc.recompute()
+    return doc