PyAnsys-dpf-core issue in reading binout energy plots

[ybavge]

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

I am currently exploring PyDPF capabilities for ls-dyna results postprocessing. I have faced issue while extracting energy plots from LSDyna d3plot/binout.
(As d3plot size is quiet large I will not attach to bug)
Internal energy, kinetic energy, total energy extraction using PYDPF is not correct (compared to LS-Prepost).

I had a closer look by writing file in .CSV , pydpf time frequency column is inconsistent in order.

Steps To Reproduce

Extract the energy plots using following code :
from ansys.dpf import core as dpf
import matplotlib.pyplot as plt
import os

#serve config
server = dpf.start_local_server(ansys_path=r"D:\PyANSYS\dpf_Server_25R1_pre0\ansys_dpf_server_win_v2025.1.pre0\ansys\dpf\server_2025_1_pre0")
ds=dpf.DataSources()
print(dpf.SERVER.version)

#User inputs needed
d3plot_dir = r"D:\Magna_iDS\LS_Dyna_Models\A05_updated\CF_study\Final_A05_DOE\Design0005_3c44fde4f8d311ee90230050568b68ba"
State_ID = 250
Part_ID_list = list(range(1,15)) + list(range(2000001,2000007))

#dpf setup
d3plot_file = os.path.join(d3plot_dir,"d3plot")
binout_file = os.path.join(d3plot_dir, "binout")
ds=dpf.DataSources()
ds.set_result_file_path(d3plot_file,"d3plot")
ds.set_result_file_path(binout_file, "binout")
model=dpf.Model(ds)
#print(model)

#get length of transient data
tf = model.metadata.time_freq_support.time_frequencies.data
no_of_states = len(tf)

#Check energy balance and sliding interface energy
SE = model.results.global_sliding_interface_energy().eval()
IE = model.results.global_internal_energy().eval()
KE = model.results.global_kinetic_energy().eval()
TE = model.results.global_total_energy().eval()
#plt.plot(SE.time_freq_support.time_frequencies.data, SE[0].data)
plt.plot(IE.time_freq_support.time_frequencies.data, IE[0].data)

print(IE.time_freq_support.time_frequencies.data)

print(IE[0].data)

plt.plot(KE.time_freq_support.time_frequencies.data, KE[0].data)

plt.plot(TE.time_freq_support.time_frequencies.data, TE[0].data)

plt.show()

Which Operating System causes the issue?

Windows

Which DPF/Ansys version are you using?

DPF Server 2025.1.pre0

Which Python version causes the issue?

3.11

Installed packages

(pydpfvenv1) D:\PyANSYS\sample_workflow>C:\Users\ybavge.ansys_python_venvs\venv_pydpf_171024\Scripts\pip list
Package Version

---

aiohappyeyeballs 2.4.3
aiohttp 3.10.10
aiosignal 1.3.1
ansys-api-mechanical 0.1.2
ansys-api-platform-instancemanagement 1.1.0
ansys-dpf-core 0.12.1
ansys-mechanical-core 0.11.8
ansys-mechanical-env 0.1.8
ansys-platform-instancemanagement 1.1.2
ansys-pythonnet 3.1.0rc3
ansys-tools-path 0.6.0
ansys-tools-visualization-interface 0.4.5
appdirs 1.4.4
attrs 24.2.0
beartype 0.19.0
cachetools 5.5.0
certifi 2024.8.30
cffi 1.17.1
charset-normalizer 3.4.0
click 8.1.7
clr-loader 0.2.6
colorama 0.4.6
contourpy 1.3.0
cycler 0.12.1
fonttools 4.54.1
frozenlist 1.4.1
google-api-core 2.21.0
google-api-python-client 2.149.0
google-auth 2.35.0
google-auth-httplib2 0.2.0
googleapis-common-protos 1.65.0
grpcio 1.67.0
httplib2 0.22.0
idna 3.10
imageio 2.36.0
importlib_metadata 8.5.0
kiwisolver 1.4.7
matplotlib 3.9.2
more-itertools 10.5.0
msgpack 1.1.0
multidict 6.1.0
numpy 2.1.2
packaging 24.1
pillow 11.0.0
pip 24.0
platformdirs 4.3.6
pooch 1.8.2
propcache 0.2.0
proto-plus 1.24.0
protobuf 5.28.2
psutil 6.0.0
pyasn1 0.6.1
pyasn1_modules 0.4.1
pycparser 2.22
pyparsing 3.2.0
python-dateutil 2.9.0.post0
pyvista 0.44.1
requests 2.32.3
rsa 4.9
scooby 0.10.0
setuptools 65.5.0
six 1.16.0
tqdm 4.66.5
trame 3.7.0
trame-client 3.4.0
trame-server 3.2.3
trame-vtk 2.8.11
trame-vuetify 2.7.1
typing_extensions 4.12.2
uritemplate 4.1.1
urllib3 2.2.3
usd-core 24.8
vtk 9.3.1
websockets 13.1
wslink 2.2.1
yarl 1.15.5
zipp 3.20.2

[ybavge]

@ayush-kumar-423 Let me know if you need more inputs from my end. Thanks

[ayush-kumar-423]

@PProfizi