Fem: Add Z-refinement support for Netgen

src/Mod/Fem/femmesh/netgentools.py

@@ -112,6 +112,9 @@ class NetgenTools:
             "result_file": self.result_file,
             "mesh_region": self.get_mesh_region(),
             "verbosity": self.param_grp.GetInt("LogVerbosity", 2),
+            "zrefine": self.obj.ZRefine,
+            "zrefine_size": self.obj.ZRefineSize,
+            "zrefine_direction": tuple(self.obj.ZRefineDirection),
         }
 
         with open(self.script_file, "w") as file:
@@ -146,6 +149,9 @@ def run_netgen(
     result_file,
     mesh_region,
     verbosity,
+    zrefine,
+    zrefine_size,
+    zrefine_direction,
 ):
     geom = occ.OCCGeometry(brep_file)
     ngcore.SetNumThreads(threads)
@@ -162,6 +168,12 @@ def run_netgen(
             elif t == "Solid":
                 shape.solids.solids[n - 1].maxh = l
 
+    if zrefine in ["Custom", "Regular"]:
+        for sol in shape.solids:
+            bottom = sol.faces.Min(zrefine_direction)
+            top = sol.faces.Max(zrefine_direction)
+            bottom.Identify(top, "bot-top", type=occ.IdentificationType.CLOSESURFACES)
+
     with ngcore.TaskManager():
         meshing.SetMessageImportance(verbosity)
         geom = occ.OCCGeometry(shape)
@@ -169,6 +181,11 @@ def run_netgen(
             geom.Heal()
         mesh = geom.GenerateMesh(mp=meshing.MeshingParameters(**params))
 
+        if zrefine == "Regular":
+            mesh.ZRefine("bot-top", np.arange(zrefine_size[0], 1, zrefine_size[0]))
+        elif zrefine == "Custom":
+            mesh.ZRefine("bot-top", zrefine_size)
+
     result = {{
         "coords": [],
         "Edges": [[], []],
@@ -317,7 +334,6 @@ run_netgen(**{kwds})
             "try_hexes": self.obj.TryHexes,
             "inverttets": self.obj.InvertTets,
             "inverttrigs": self.obj.InvertTrigs,
-            "autozrefine": self.obj.AutoZRefine,
             "parallel_meshing": self.obj.ParallelMeshing,
             "nthreads": self.param_grp.GetInt("NumOfThreads", QThread.idealThreadCount()),
             "closeedgefac": self.obj.CloseEdgeFactor,

src/Mod/Fem/femobjects/mesh_netgen.py

@@ -469,11 +469,32 @@ class MeshNetgen(base_fempythonobject.BaseFemPythonObject):
         )
         prop.append(
             _PropHelper(
-                type="App::PropertyBool",
-                name="AutoZRefine",
+                type="App::PropertyEnumeration",
+                name="ZRefine",
                 group="Mesh Parameters",
-                doc="Automatic Z refine",
-                value=False,
+                doc="Z-refinement for extruded shapes",
+                value=["No", "Regular", "Custom"],
+            )
+        )
+        prop.append(
+            _PropHelper(
+                type="App::PropertyVector",
+                name="ZRefineDirection",
+                group="Mesh Parameters",
+                doc="Z-refinement direction",
+                value=Base.Vector(0, 0, 1),
+            )
+        )
+        prop.append(
+            _PropHelper(
+                type="App::PropertyFloatList",
+                name="ZRefineSize",
+                group="Mesh Parameters",
+                doc="Z-refinement size given as a fraction of the shape size.\n"
+                + "For a regular partition only one value is needed",
+                value=[
+                    0.1,
+                ],
             )
         )
         prop.append(