Unable to load UDF library from API

Hello,

I am looking for a solution to load UDF from the pyfluent API. Following the API reference, I ended up with this minimal code:

solver = pyfluent.launch_fluent()
solver.settings.file.read_case(file_name=".my_mesh.msh.h5")
solver.settings.setup.user_defined.load(udf_library_name="libudf")

But, this give me an error saying that there is no user_defined attribute like mentioned in the reference:

AttributeError: 'setup' object has no attribute 'user_defined'.
The most similar names are: turbo_models

I am doing something wrong or is this a bug from the API?

Thank you for the help

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Comments

Grouaze

I forgot to mention I am using Ansys 2025 R1, and PyFluent 0.35

Adam Anderson

The way I do it is via the scheme command called via the scheme eval capability:

libname = "lib_my_model"

stop_profile_updates = "#t" if stop_profile_updates else "" # Not #f!!!

solver_session.scheme.eval(f'(open-udf-library "{libname}" {stop_profile_updates})')

Is that any use?
(Note the syntax for the scheme.eval changed in 2025R2, it's slightly different in 2025R1)