FEM: solver elmer unit test, small improvements

src/Mod/Fem/femexamples/boxanalysis_static.py

@@ -69,6 +69,10 @@ def setup_base(doc=None, solvertype="ccxtools"):
     mat["YoungsModulus"] = "200000 MPa"
     mat["PoissonRatio"] = "0.30"
     mat["Density"] = "7900 kg/m^3"
+    if solvertype == "elmer":
+        # set ThermalExpansionCoefficient
+        # FIXME elmer elasticity needs the dictionary key "ThermalExpansionCoefficient"
+        mat["ThermalExpansionCoefficient"] = "0 um/m/K"
     material_object.Material = mat
 
     # mesh
@@ -85,6 +89,7 @@ def setup_base(doc=None, solvertype="ccxtools"):
     femmesh_obj.FemMesh = fem_mesh
     femmesh_obj.Part = geom_obj
     femmesh_obj.SecondOrderLinear = False
+    femmesh_obj.CharacteristicLengthMin = "8.0 mm"
 
     doc.recompute()
     return doc
@@ -108,7 +113,10 @@ def setup(doc=None, solvertype="ccxtools"):
         )[0]
         solver_object.WorkingDir = u""
     elif solvertype == "elmer":
-        analysis.addObject(ObjectsFem.makeSolverElmer(doc, "SolverElmer"))
+        solver_object = analysis.addObject(
+            ObjectsFem.makeSolverElmer(doc, "SolverElmer")
+        )[0]
+        ObjectsFem.makeEquationElasticity(doc, solver_object)
     elif solvertype == "z88":
         analysis.addObject(ObjectsFem.makeSolverZ88(doc, "SolverZ88"))
     if solvertype == "calculix" or solvertype == "ccxtools":

src/Mod/Fem/femtest/app/test_solver_elmer.py

@@ -31,7 +31,6 @@ from os.path import join
 import FreeCAD
 
 import femsolver.run
-import ObjectsFem
 from . import support_utils as testtools
 from .support_utils import fcc_print
 
@@ -98,34 +97,17 @@ class TestSolverElmer(unittest.TestCase):
         from femexamples.boxanalysis_static import setup
         setup(self.document, "elmer")
 
-        analysis_obj = self.document.Analysis
+        # for information:
+        # elmer needs gmsh mesho object
+        # FIXME error message on Python solver run
+        # the examples do use a gmsh mesh object thus ok
+        # FIXME elmer elasticity needs the dict key "ThermalExpansionCoefficient" in material
+
         solver_obj = self.document.SolverElmer
-        material_obj = self.document.MechanicalMaterial
-        mesh_obj = self.document.Mesh
-        box_object = self.document.Box
 
         base_name = "cube_static"
         analysis_dir = testtools.get_unit_test_tmp_dir(self.temp_dir, solver_obj.Name)
 
-        # TODO move to elmer solver of femexample code
-        ObjectsFem.makeEquationElasticity(self.document, solver_obj)
-
-        # set ThermalExpansionCoefficient
-        # FIXME elmer elasticity needs the dictionary key "ThermalExpansionCoefficient"
-        # even on simple elasticity analysis, otherwise it fails
-        mat = material_obj.Material
-        mat["ThermalExpansionCoefficient"] = "0 um/m/K"
-        material_obj.Material = mat
-
-        # elmer needs a GMHS mesh object
-        # FIXME error message on Python solver run
-        mesh_gmsh = ObjectsFem.makeMeshGmsh(self.document)
-        mesh_gmsh.CharacteristicLengthMin = "9 mm"
-        mesh_gmsh.FemMesh = mesh_obj.FemMesh
-        mesh_gmsh.Part = box_object
-        analysis_obj.addObject(mesh_gmsh)
-        self.document.removeObject(mesh_obj.Name)  # remove original mesh object
-
         # save the file
         save_fc_file = join(analysis_dir, solver_obj.Name + "_" + base_name + ".FCStd")
         fcc_print("Save FreeCAD file to {}...".format(save_fc_file))

src/Mod/Fem/femtest/data/elmer/group_mesh.geo

@@ -13,7 +13,7 @@ Physical Volume("Solid1") = {1};
 // no boundary layer settings for this mesh
 // min, max Characteristic Length
 Mesh.CharacteristicLengthMax = 1e+22;
-Mesh.CharacteristicLengthMin = 9.0;
+Mesh.CharacteristicLengthMin = 8.0;
 
 // optimize the mesh
 Mesh.Optimize = 1;