Entire mesh is fetched when initializing a Simulation object

[FedericoNegri]

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

Initializing a Simulation object requires fetching the entire mesh because of Simulation._units["distance"] , see

pydpf-post/src/ansys/dpf/post/simulation.py

Line 86 in ea886a3

"distance": self._model.metadata.meshed_region.unit,

For large models, this makes the initialization very slow.

Steps To Reproduce

from ansys.dpf import post

path = r"<path/to/large/model>"
simulation = post.load_simulation(path)

Which Operating System are you using?

Windows

Which DPF/Ansys version are you using?

Ansys 2024 R1

Which Python version are you using?

3.10

Installed packages

ansys-dpf-core @ git+https://[email protected]/ansys/pydpf-core.git
ansys-dpf-post @ git+https://github.com/ansys/pydpf-post.git