FLUENT: Problem reading face zones from mesh without cell zone

[PProfizi]

Before submitting the issue

• I have checked for Compatibility issues
• I have searched among the existing issues
• I am using a Python virtual environment

Description of the bug

Raised by @mhoeijm

The question is whether it is normal for the fluent meshes_provider to not return meshes for face zones on bodies without a cell zone.
If this is expected behavior, should it then be improved?

The description in the example for this states:
If no region_scoping is connected, the MeshedRegion for all body and face zones is retrieved in a MeshesContainer

@mhoeijm feel free to add to this description of the issue.

Steps To Reproduce

Using the following script

import os

import ansys.dpf.core as dpf

FLUENT_BOX = r"box_no_cells-2.msh.h5"
os.environ["ANSYS_DPF_ACCEPT_LA"] = "Y"

ds = dpf.DataSources()
ds.set_result_file_path(FLUENT_BOX, key="cas")

streams = dpf.operators.metadata.streams_provider(data_sources=ds)
meshes = dpf.operators.mesh.meshes_provider(streams_container=streams, region_scoping=None).eval()

# get mesh info:
model = dpf.Model(data_sources=ds)
minfo: dpf.MeshInfo = model.metadata.mesh_info

print(model)

with the following file:

box_no_cells-2.msh.h5.zip

One box has a cell zone defined and the meshes_provider correctly returns the cell zone along with associated face zones, whereas the second box is made only of face zones which are not returned by the operator.

Which Operating System causes the issue?

Windows

Which DPF/Ansys version are you using?

DPF Server 2025.2.pre0, Ansys 2025 R1

Which Python version causes the issue?

3.12

Installed packages

ansys-dpf-core==0.13.3

[PProfizi]

@rafacanton FYI