Fem: Add cylindrical shell example

src/Mod/Fem/CMakeLists.txt

@@ -78,6 +78,7 @@ SET(FemExamples_SRCS
     femexamples/equation_electrostatics_capacitance_two_balls.py
     femexamples/equation_electrostatics_electricforce_elmer_nongui6.py
     femexamples/frequency_beamsimple.py
+    femexamples/frequency_cylindricalshell.py
     femexamples/manager.py
     femexamples/material_multiple_bendingbeam_fiveboxes.py
     femexamples/material_multiple_bendingbeam_fivefaces.py
@@ -115,6 +116,7 @@ SET(FemExampleMeshes_SRCS
     femexamples/meshes/mesh_constraint_tie_tetra10.py
     femexamples/meshes/mesh_contact_box_halfcylinder_tetra10.py
     femexamples/meshes/mesh_contact_tube_tube_tria3.py
+    femexamples/meshes/mesh_cylindricalshell_quad4.py
     femexamples/meshes/mesh_eigenvalue_of_elastic_beam_tetra10.py
     femexamples/meshes/mesh_electricforce_elmer_nongui6_tetra10.py
     femexamples/meshes/mesh_flexural_buckling.py

src/Mod/Fem/femexamples/frequency_cylindricalshell.py

@@ -0,0 +1,166 @@
+# ***************************************************************************
+# *   Copyright (c) 2022 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
+
+import Draft
+
+import Fem
+import ObjectsFem
+
+from . import manager
+from .manager import get_meshname
+from .manager import init_doc
+
+
+def get_information():
+    return {
+        "name": "Frequency Analysis Cylindrical Shell",
+        "meshtype": "face",
+        "meshelement": "Quad4",
+        "constraints": ["fixed"],
+        "solvers": ["calculix", "ccxtools"],
+        "material": "solid",
+        "equation": "frequency",
+    }
+
+
+def get_explanation(header=""):
+    return (
+        header
+        + """
+
+To run the example from Python console use:
+from femexamples.frequency_cylindrical_shell import setup
+setup()
+
+
+See forum topic post:
+https://forum.freecadweb.org/viewtopic.php?f=18&t=65382#p564156
+frequency analysis for cylindrical shell
+
+"""
+    )
+
+
+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 object
+    # create cylinder
+    cyl_obj = doc.addObject("Part::Cylinder", "Cylinder")
+    cyl_obj.Radius = 5000
+    cyl_obj.Height = 5000
+    doc.recompute()
+    if FreeCAD.GuiUp:
+        cyl_obj.ViewObject.Document.activeView().viewAxonometric()
+        cyl_obj.ViewObject.Document.activeView().fitAll()
+
+    # create cylindrical shell
+    Draft.downgrade(cyl_obj, delete=True)
+    doc.removeObject("Face001")
+    doc.removeObject("Face002")
+    doc.recompute()
+
+    # 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.SplitInputWriter = False
+        solver_obj.AnalysisType = "frequency"
+        solver_obj.GeometricalNonlinearity = "linear"
+        solver_obj.ThermoMechSteadyState = False
+        solver_obj.MatrixSolverType = "default"
+        solver_obj.IterationsControlParameterTimeUse = False
+        solver_obj.EigenmodesCount = 10
+        solver_obj.EigenmodeHighLimit = 1000000.0
+        solver_obj.EigenmodeLowLimit = 0.01
+    analysis.addObject(solver_obj)
+
+    # material
+    material_obj = analysis.addObject(
+        ObjectsFem.makeMaterialSolid(doc, "MechanicalMaterial")
+    )[0]
+    mat = material_obj.Material
+    mat["Name"] = "Steel-Generic"
+    mat["YoungsModulus"] = "210 GPa"
+    mat["PoissonRatio"] = "0.30"
+    mat["Density"] = "7900 kg/m^3"
+    material_obj.Material = mat
+    analysis.addObject(material_obj)
+
+    # constraint displacement xyz
+    con_disp_xyz = ObjectsFem.makeConstraintDisplacement(doc, "Fix_Z")
+    con_disp_xyz.References = [(doc.Face, "Edge2")]
+    con_disp_xyz.xFix = False
+    con_disp_xyz.xFree = True
+    con_disp_xyz.xDisplacement = 0.0
+    con_disp_xyz.yFix = False
+    con_disp_xyz.yFree = True
+    con_disp_xyz.yDisplacement = 0.0
+    con_disp_xyz.zFix = True
+    con_disp_xyz.zFree = False
+    con_disp_xyz.zDisplacement = 0.0
+    analysis.addObject(con_disp_xyz)
+
+    # add thickness
+    geo_thickness = ObjectsFem.makeElementGeometry2D(doc, 10)
+    analysis.addObject(geo_thickness)
+
+    # mesh
+    from .meshes.mesh_cylindricalshell_quad4 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 = doc.Face
+    femmesh_obj.SecondOrderLinear = False
+    femmesh_obj.CharacteristicLengthMax = "250.0 mm"
+
+    doc.recompute()
+    return doc