Struggling to read a s2s file created by fluent

[DiogoGomes1406]

Hi,

I’m encountering a persistent issue when working with the S2S radiation model through PyFluent.

I create the S2S file using:

solver.settings.setup.models.radiation.s2s.compute_write_vf(file_name=Path(s2s_path).as_posix())

Then, when I try to read it back later using:

solver.settings.setup.models.radiation.s2s.read_vf_file(file_name=Path(s2s_path).as_posix())

I get the following error:

"The mesh has been modified.
Previously saved S2S files are incompatible and cannot be read."

However, the mesh has not been modified — I’m trying to read the file right after generating it, in the same session.

I also tested two workflows:

A full workflow done entirely with PyFluent (meshing → setup → solution), and

the same workflow, but the s2s file is created using the GUI.

Even though the settings files are exactly the same (I compared them line-by-line in Notepad++), Fluent still refuses to load the .s2s file generated through PyFluent, both in PyFluent and in the GUI. I can not also load a s2s file created using the GUI, in pyfluent.

Has anyone experienced this issue or found a workaround?

Thanks in advance!