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Support ufl expressions and submesh quantities in interpolate_to_surface_submesh #226

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Merged
jorgensd merged 2 commits into from
Jun 4, 2026
Merged

Support ufl expressions and submesh quantities in interpolate_to_surface_submesh #226

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a7fcf10
Updates to work with submesh quantities
jorgensd Jun 4, 2026
14c69fd
Remove breakpoint
jorgensd Jun 4, 2026
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17 changes: 12 additions & 5 deletions src/scifem/interpolation.py
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Original file line number Diff line number Diff line change
Expand Up @@ -333,6 +333,7 @@ def interpolate_to_surface_submesh(
u_surface: dolfinx.fem.Function,
submesh_facets: npt.NDArray[np.int32],
integration_entities: npt.NDArray[np.int32],
entity_maps: list[dolfinx.mesh.EntityMap] | None = None,
):
"""
Interpolate a function `u_volume` into the function `u_surface`.
Expand All @@ -350,24 +351,29 @@ def interpolate_to_surface_submesh(
"""
if Version(dolfinx.__version__) < Version("0.10.0"):
raise RuntimeError("interpolate_to_submesh requires dolfinx version 0.10.0 or higher")
V_vol = u_volume.function_space
mesh = V_vol.mesh
ufl_domains = ufl.domain.extract_domains(u_volume)
max_tdim_pos = np.argmax([domain.ufl_cargo().topology.dim for domain in ufl_domains])
mesh = dolfinx.mesh.Mesh(ufl_domains[max_tdim_pos].ufl_cargo(), ufl_domains[max_tdim_pos])

V_surf = u_surface.function_space
submesh = V_surf.mesh
ip = V_surf.element.interpolation_points

expr = dolfinx.fem.Expression(u_volume, ip)

try:
expr = dolfinx.fem.Expression(u_volume, ip, entity_maps=entity_maps)
except TypeError:
expr = dolfinx.fem.Expression(u_volume, ip)
mesh.topology.create_connectivity(mesh.topology.dim, submesh.topology.dim)
mesh.topology.create_connectivity(submesh.topology.dim, mesh.topology.dim)

data = expr.eval(mesh, integration_entities)

submesh.topology.create_entity_permutations()
mesh.topology.create_entity_permutations()
ft = V_surf.element.basix_element.cell_type

if Version(dolfinx.__version__) < Version("0.11.0.dev0"):
V_vol = u_volume.function_space
mesh = V_vol.mesh
# Before the introduction of https://github.com/FEniCS/dolfinx/pull/4140
# one needed to permute the data according to the facet permutations.
cell_info = mesh.topology.get_cell_permutation_info()
Expand Down Expand Up @@ -396,5 +402,6 @@ def interpolate_to_surface_submesh(
interpolate_func = u_surface._cpp_object.interpolate_f
else:
interpolate_func = u_surface._cpp_object.interpolate

interpolate_func(shaped_data, submesh_facets)
u_surface.x.scatter_forward()
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