Help with running "Run a full-heart EP mechanics simulation" example from the PyANSYS heart library page

[Omar-AbuAlmaaza]

Hello everyone. My name is Omar and I am currently pursuing my MASc in Mechanical Engineering. I never posted a discussion post before on Github so please excuse me for formatting issues.

I am exploring cardiac simulation and CFD. I came across the ansys.health.heart library and I thought it looks like an excellent starting point for my research. It would be really cool to use some of these examples as a starting geometry to play around with.

I am attempting to run the ep-mechanics-simulator-fullheart.py example but am encountering a critical error when the script makes its first call to the LS-Dyna solver. The Python script initializes correctly, loads the model, and begins the simulator.compute_fibers() step. However, it fails when it attempts to run the LS-Dyna solver. The script returns a Python exception, ansys.health.heart.exceptions.LSDYNATerminationError, indicating the solver did not terminate as expected. These are some of the key error messages that I got (see images). I am wondering if this is a solver version compatibility issue. I believe I have LS-DYNA executable version 14.1 installed with ANSYS 2025 R2. I would like more insight on this issue.

Any help and guidance would be much appreciated. Thank you!

[mhoeijm]

Hello @Omar-AbuAlmaaza. Sorry for the late response - I unfortunately never got a notification so did not see your message. Did you manage to find a solution already? This indeed seems an incompatibility of the LS-DYNA version. Can you try the beta version that gets shipped with the installation (appended with *_beta)? This beta version should have all the requirements. This is intelMPI though, so you need to make sure you have the right MPI environment set up to use that.

Please let me know if you need any further assistance.