def METHOD_NAME(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(
            "Unknown or unsupported 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