Large-scale bus rollover simulation (ANSYS/LS-DYNA) – convergence and modeling strategy advice needed
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Hi everyone,
I’m currently working on a full bus rollover simulation with a large structural assembly, and I’m facing a modeling strategy issue regarding part definition and meshing.
Current Modeling Situation
If I merge the entire structure into a single Part (shared topology), the meshing process becomes extremely difficult:
- Mesh quality drops significantly
- Local mesh failures appear
- It becomes very hard to control element quality in complex joint regions
However, if I keep every component as separate Parts:
- The analysis becomes unstable
- Contact definitions increase significantly
- The model becomes very sensitive to contact settings
- Convergence issues occur more frequently
Currently, I am defining the connection interfaces using:
- Bonded contact
- MPC (Multi-Point Constraint)
But I’m unsure whether this is the correct global modeling strategy for such a large nonlinear rollover case.
My Question
For large vehicle structural assemblies:
- Do you typically merge structural members into larger Parts?
- Or keep them separated and manage with contacts/MPC?
- How do you balance mesh control vs analysis stability?
- At what point would you simplify the structural connectivity?
Any advice on improving overall modeling robustness would be greatly appreciated.
Thank you.
Posted Feb 26, 2026, 1:50 PM UTC
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