Fem: Add support for 2D geometries to Centrif constraint

src/Mod/Fem/femmesh/meshsetsgetter.py

@@ -467,16 +467,11 @@ class MeshSetsGetter:
     # ********************************************************************************************
     # element sets constraints
     def get_constraints_centrif_elements(self):
-        # get element ids and write them into the femobj
-        if not self.member.cons_centrif:
-            return
-        if (
-            len(self.member.cons_centrif) == 1
-            and not self.member.cons_centrif[0]["Object"].References
-        ):
-            self.member.cons_centrif[0]["FEMElements"] = self.ccx_evolumes
-        else:
-            self.get_solid_element_sets(self.member.cons_centrif)
+        for femobj in self.member.cons_centrif:
+            obj = femobj["Object"]
+            result = self._get_ccx_elements(obj)
+
+            femobj["CentrifElements"] = result
 
     def get_constraints_bodyheatsource_elements(self):
         for femobj in self.member.cons_bodyheatsource:

src/Mod/Fem/femsolver/calculix/write_constraint_centrif.py

@@ -60,12 +60,16 @@ def get_after_write_constraint():
 
 
 def write_meshdata_constraint(f, femobj, centrif_obj, ccxwriter):
+
     f.write(f"*ELSET,ELSET={centrif_obj.Name}\n")
-    if isinstance(femobj["FEMElements"], str):
-        f.write("{}\n".format(femobj["FEMElements"]))
-    else:
-        for e in femobj["FEMElements"]:
-            f.write(f"{e},\n")
+    for refs, elem, is_sub_el in femobj["CentrifElements"]:
+        if not is_sub_el:
+            for e in elem:
+                f.write(f"{e},\n")
+
+    # use all elements if there are no references
+    if not femobj["CentrifElements"]:
+        f.write(f"{ccxwriter.ccx_eall}\n")
 
 
 def write_constraint(f, femobj, centrif_obj, ccxwriter):

src/Mod/Fem/femtaskpanels/task_constraint_centrif.py

@@ -62,10 +62,13 @@ class _TaskPanel(base_femtaskpanel._BaseTaskPanel):
         self.axis_selection_widget = selection_widgets.GeometryElementsSelection(
             obj.RotationAxis, ["Edge"], False, False
         )
+        self.axis_selection_widget.setWindowTitle(
+            self.axis_selection_widget.tr("Axis Reference Selector")
+        )
 
         # loaded body selection widget
         self.body_selection_widget = selection_widgets.GeometryElementsSelection(
-            obj.References, ["Solid"], False, False
+            obj.References, ["Solid", "Face"], False, False
         )
 
         # form made from param and selection widget