Random results/crashes when getting skin results

[janvonrickenbach]

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

The following snipped reads strains from a distributed rst file. The resulting array (res.array) has a random size every time the script is run (usually 220 or 216). Sometimes the script also crashes.

To reproduce:

• Download the attached file, remove the png extension and unpack the archive.
• set data_directory to the folder where you extracted the archive
• Run the script below => the assertion fails with either a value of 216, 220.

Notes:

• Running the server in a pydpf-composite docker container and connecting to it yields always the same result (224)
• Setting the skin flag to False results in always the same results

import os
from ansys.dpf.core import DataSources
from ansys.dpf.post import StaticMechanicalSimulation
from ansys.dpf.post.simulation import ResultCategory

data_directory = 
distributed_files = [
    os.path.join(data_directory, f"file{i}.rst") for i in range(4)
]

ds = DataSources()
for domain_id, file_path in enumerate(distributed_files):
    ds.set_domain_result_file_path(file_path, domain_id)

model = StaticMechanicalSimulation(result_file=ds)

selection = model._build_selection(
    base_name="EPEL",
    category=ResultCategory.matrix,
    location="Elemental",
    skin=True,
    set_ids=[5],
    times=None,
    selection=None,
)

res = model._get_result(
    base_name="EPEL",
    location="Elemental",
    category=ResultCategory.matrix,
    selection=selection,
)
assert res.array.shape[0] == 224, res.array.shape[0]

distributed.zip

Steps To Reproduce

See above

Which Operating System are you using?

Windows

Which DPF/Ansys version are you using?

DPF Server 2025.1.pre0

Which Python version are you using?

3.10

Installed packages

annotated-types==0.7.0
ansys-dpf-core @ git+https://[email protected]/ansys/pydpf-core.git@24523e39859964b54cc8de1b07c9096f4ec804ad
ansys-dpf-post @ git+https://github.com/ansys/pydpf-post.git@e47a80a336093b7e06fc07d27045b1d1a4b41627
ansys-hps-client @ git+https://github.com/ansys/pyhps.git@4512655320766fa5575491ade15dc720875b2809
anyio==4.4.0
backoff==2.2.1
backports.tarfile==1.2.0
build==1.2.1
cachetools==5.3.3
certifi==2024.2.2
cfgv==3.4.0
charset-normalizer==3.3.2
click==8.1.7
colorama==0.4.6
contourpy==1.2.1
coverage==7.5.3
cx_Freeze==6.15.16
cx_Logging==3.2.0
cycler==0.12.1
distlib==0.3.8
dnspython==2.6.1
docutils==0.21.2
email_validator==2.1.1
exceptiongroup==1.2.1
fast_simplification==0.1.7
fastapi==0.111.0
fastapi-cli==0.0.4
filelock==3.14.0
fonttools==4.52.4
google-api-core==2.19.0
google-api-python-client==2.131.0
google-auth==2.29.0
google-auth-httplib2==0.2.0
googleapis-common-protos==1.63.0
grpcio==1.64.0
h11==0.14.0
httpcore==1.0.5
httplib2==0.22.0
httptools==0.6.1
httpx==0.27.0
humanize==4.9.0
identify==2.5.36
idna==3.7
importlib_metadata==7.1.0
iniconfig==2.0.0
jaraco.classes==3.4.0
jaraco.context==5.3.0
jaraco.functools==4.0.1
Jinja2==3.1.4
keyring==25.2.1
kiwisolver==1.4.5
lief==0.14.1
markdown-it-py==3.0.0
MarkupSafe==2.1.5
marshmallow==3.21.2
marshmallow-oneofschema==3.1.1
matplotlib==3.9.0
mdurl==0.1.2
more-itertools==10.2.0
nh3==0.2.17
nodeenv==1.9.0
numpy==1.26.4
orjson==3.10.3
packaging==24.0
pandas==2.2.2
pillow==10.3.0
pkginfo==1.10.0
platformdirs==4.2.2
plotly==5.22.0
pluggy==1.5.0
pooch==1.8.1
portend==3.2.0
pre-commit==3.7.1
proto-plus==1.23.0
protobuf==4.25.3
psutil==5.9.8
pyasn1==0.6.0
pyasn1_modules==0.4.0
pydantic==2.7.0
pydantic-settings==2.2.1
pydantic_core==2.18.1
Pygments==2.18.0
PyJWT==2.8.0
pyparsing==3.1.2
pyproject_hooks==1.1.0
pytest==8.2.1
pytest-cov==5.0.0
pytest-rerunfailures==14.0
pytest-timeout==2.3.1
python-dateutil==2.9.0.post0
python-dotenv==1.0.1
python-multipart==0.0.9
pytz==2024.1
pyvista==0.43.8
pywin32-ctypes==0.2.2
PyYAML==6.0.1
readme_renderer==43.0
requests==2.32.2
requests-toolbelt==1.0.0
rfc3986==2.0.0
rich==13.7.1
rsa==4.9
scooby==0.10.0
shellingham==1.5.4
six==1.16.0
sniffio==1.3.1
starlette==0.37.2
tempora==5.5.1
tenacity==8.3.0
tomli==2.0.1
tqdm==4.66.4
twine==5.1.0
typer==0.12.3
typing_extensions==4.12.0
tzdata==2024.1
ujson==5.10.0
uritemplate==4.1.1
urllib3==2.2.1
uvicorn==0.29.0
virtualenv==20.26.2
vtk==9.3.0
watchfiles==0.22.0
websockets==12.0
zipp==3.19.0

[MichaelNale]

@janvonrickenbach I think that the link to download your rst is broken or I need access.

[janvonrickenbach]

@MichaelNale Sorry for that. I replaced the link.