FEM: add new cyclic symm centrif example

src/Mod/Fem/CMakeLists.txt

@@ -72,6 +72,7 @@ SET(FemExamples_SRCS
     femexamples/ccx_cantilever_faceload.py
     femexamples/ccx_cantilever_nodeload.py
     femexamples/ccx_cantilever_prescribeddisplacement.py
+    femexamples/ccx_disc_cyclic_symm_centrif.py
     femexamples/ccx_rigid_body.py
     femexamples/ccx_pipe_pressure_2D.py
     femexamples/constraint_centrif.py

src/Mod/Fem/femexamples/ccx_disc_cyclic_symm_centrif.py

@@ -0,0 +1,179 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+# ***************************************************************************
+# *   Copyright (c) 2025 Jakub Michalski <jakub.j.michalski[at]gmail.com>   *
+# *                                                                         *
+# *   This file is part of FreeCAD.                                         *
+# *                                                                         *
+# *   FreeCAD is free software: you can redistribute it and/or modify it    *
+# *   under the terms of the GNU Lesser General Public License as           *
+# *   published by the Free Software Foundation, either version 2.1 of the  *
+# *   License, or (at your option) any later version.                       *
+# *                                                                         *
+# *   FreeCAD 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      *
+# *   Lesser General Public License for more details.                       *
+# *                                                                         *
+# *   You should have received a copy of the GNU Lesser General Public      *
+# *   License along with FreeCAD. If not, see                               *
+# *   <https://www.gnu.org/licenses/>.                                      *
+# *                                                                         *
+# ***************************************************************************
+
+import FreeCAD
+from FreeCAD import Rotation
+from FreeCAD import Vector
+
+import ObjectsFem
+
+from . import manager
+from .manager import get_meshname
+from .manager import init_doc
+
+
+def get_information():
+    return {
+        "name": "Rotating Disc Cyclic Symmetry Centrif",
+        "meshtype": "solid",
+        "meshelement": "Tet10",
+        "constraints": ["tie", "centrif", "displacement"],
+        "solvers": ["ccxtools"],
+        "material": "solid",
+        "equations": ["mechanical"],
+    }
+
+
+def get_explanation(header=""):
+    return (
+        header
+        + """
+
+To run the example from Python console use:
+from femexamples.ccx_disc_cyclic_symm_centrif import setup
+setup()
+
+Analytical solution - max von Mises stress 109.78 MPa = 1.0987e8 Pa
+
+"""
+    )
+
+
+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
+    cylinder1 = doc.addObject("Part::Cylinder", "Cylinder1")
+    cylinder1.Placement = FreeCAD.Placement(Vector(0, 0, 0), Rotation(Vector(0, 0, 1), 0))
+    cylinder1.Radius = "400 mm"
+    cylinder1.Height = "50 mm"
+    cylinder1.Angle = "45 deg"
+    
+
+    cylinder2 = doc.addObject("Part::Cylinder", "Cylinder2")
+    cylinder2.Placement = FreeCAD.Placement(Vector(0, 0, 0), Rotation(Vector(0, 0, 1), 0))
+    cylinder2.Radius = "200 mm"
+    cylinder2.Height = "50 mm"
+    cylinder2.Angle = "45 deg"
+
+    geom_obj = doc.addObject("Part::Cut", "Cut")
+    geom_obj.Base = cylinder1
+    geom_obj.Tool = cylinder2
+    doc.recompute()
+
+    if FreeCAD.GuiUp:
+        geom_obj.ViewObject.Document.activeView().viewAxonometric()
+        geom_obj.ViewObject.Document.activeView().fitAll()
+
+    # line for centrif axis
+    axis = doc.addObject("Part::Line", "Axis")
+    axis.Placement = FreeCAD.Placement(Vector(0, 0, 0), Rotation(Vector(0, 0, 1), 0))
+    axis.X1 = "0.00 mm"
+    axis.Y1 = "0.00 mm"
+    axis.Z1 = "0.00 mm"
+    axis.X2 = "0.00 mm"
+    axis.Y2 = "0.00 mm"
+    axis.Z2 = "50.00 mm"
+    doc.recompute()
+    if FreeCAD.GuiUp:
+        axis.ViewObject.LineWidth = 5.0
+        axis.ViewObject.LineColor = (1.0, 0.0, 0.0)
+
+    # analysis
+    analysis = ObjectsFem.makeAnalysis(doc, "Analysis")
+    if FreeCAD.GuiUp:
+        import FemGui
+
+        FemGui.setActiveAnalysis(analysis)
+
+    # solver
+    if solvertype == "ccxtools":
+        solver_obj = ObjectsFem.makeSolverCalculiXCcxTools(doc, "CalculiXCcxTools")
+        solver_obj.AnalysisType = "static"
+        analysis.addObject(solver_obj)
+    else:
+        FreeCAD.Console.PrintWarning(
+            "Unknown or unsupported solver type: {}. "
+            "No solver object was created.\n".format(solvertype)
+        )
+
+    # material
+    material_obj = ObjectsFem.makeMaterialSolid(doc, "Steel")
+    mat = material_obj.Material
+    mat["Name"] = "Calculix-Steel"
+    mat["YoungsModulus"] = "210000 MPa"
+    mat["PoissonRatio"] = "0.30"
+    mat["Density"] = "8000 kg/m^3"
+    material_obj.Material = mat
+    material_obj.References = [(geom_obj, "Solid1")]
+    analysis.addObject(material_obj)
+
+    # constraint tie
+    con_tie = ObjectsFem.makeConstraintTie(doc, "ConstraintTie")
+    con_tie.References = [
+        (geom_obj, "Face2"),
+        (geom_obj, "Face3"),
+    ]
+    con_tie.Tolerance = 0.2
+    con_tie.CyclicSymmetry = True
+    con_tie.Sectors = 8
+    con_tie.ConnectedSectors = 1
+    analysis.addObject(con_tie)
+    
+    # constraint centrif
+    con_centrif = ObjectsFem.makeConstraintCentrif(doc, "ConstraintCentrif")
+    con_centrif.References = [(geom_obj, "Solid1")]
+    con_centrif.RotationFrequency = "50 Hz"
+    con_centrif.RotationAxis = [(axis, "Edge1")]
+    analysis.addObject(con_centrif)
+    
+    # constraint displacement
+    con_disp = ObjectsFem.makeConstraintDisplacement(doc, "ConstraintDisplacement")
+    con_disp.References = [(geom_obj, ("Vertex8"))]
+    analysis.addObject(con_disp)
+    con_disp.zFree = False
+    con_disp.zDisplacement = "0.00 mm"
+
+    # mesh
+    femmesh_obj = analysis.addObject(ObjectsFem.makeMeshGmsh(doc, get_meshname()))[0]
+    femmesh_obj.Shape = geom_obj
+    femmesh_obj.ElementOrder = "2nd"
+    femmesh_obj.CharacteristicLengthMax = "10 mm"
+    femmesh_obj.ViewObject.Visibility = False
+
+    # generate the mesh
+    from femmesh import gmshtools
+
+    gmsh_mesh = gmshtools.GmshTools(femmesh_obj, analysis)
+    gmsh_mesh.create_mesh()
+
+    doc.recompute()
+    return doc
+