Add periodic boundary condtions section string (#119)

Author: m-frey

src/cubitpy/cubitpy_types.py

@@ -292,6 +292,8 @@ class BoundaryConditionType(Enum):
     # Please use "solid_to_solid_contact" instead.
     solid_to_solid_surface_contact = auto()
     solid_to_solid_contact = auto()
+    periodic_rve_surface = auto()
+    periodic_rve_edge = auto()
 
     # fluid
     flow_rate = auto()
@@ -362,6 +364,12 @@ def get_dat_bc_section_header(self, geometry_type):
             geometry_type == GeometryType.curve
         ):
             return "FLUID NEUMANN INFLOW LINE CONDITIONS"
+        elif self == self.periodic_rve_surface and (
+            geometry_type == GeometryType.surface
+        ):
+            return "DESIGN SURF PERIODIC RVE 3D BOUNDARY CONDITIONS"
+        elif self == self.periodic_rve_edge and (geometry_type == GeometryType.curve):
+            return "DESIGN EDGE PERIODIC RVE 2D BOUNDARY CONDITIONS"
         else:
             raise ValueError(
                 "No implemented case for {} and {}!".format(self, geometry_type)

tests/test_cubitpy.py

@@ -2259,3 +2259,25 @@ def test_object_formatter():
         TypeError, match="Expected CubitObject, CubitGroup or int, but got "
     ):
         formatter(surface_1, 0.5)
+
+
+@pytest.mark.parametrize(
+    ("bc_type", "geometry", "expected_section"),
+    [
+        (
+            cupy.bc_type.periodic_rve_surface,
+            cupy.geometry.surface,
+            "DESIGN SURF PERIODIC RVE 3D BOUNDARY CONDITIONS",
+        ),
+        (
+            cupy.bc_type.periodic_rve_edge,
+            cupy.geometry.curve,
+            "DESIGN EDGE PERIODIC RVE 2D BOUNDARY CONDITIONS",
+        ),
+    ],
+)
+def test_periodic_rve_boundary_condition_section_headers(
+    bc_type, geometry, expected_section
+):
+    """Check section headers for periodic RVE boundary condition types."""
+    assert bc_type.get_dat_bc_section_header(geometry) == expected_section