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[binghuan.li19]

Hello,

I am using LS-DYNA 2025 R2 on Windows to obtain the unloaded configuration of a pressurised hyperelastic model using *CONTROL_REFERENCE_CONFIGURATION.

The analysis is launched with the CASE option, as required:

mpiexec -np %NCPU% -aa -a "%SOLVER%" CASE i=run_zero_p_config.k memory=%MEMORY%

The target.k file contains only the target nodal coordinates. The material is an Ogden hyperelastic model, and the forward analysis is implicit.

LS-DYNA generates iter2.inp and iter1.guess, but it does not generate iter1.algo. When iteration 2 starts, LS-DYNA crashes in REPNOD, apparently while attempting to read the missing iter1.algo file:

forrtl: severe (157): Program Exception - access violation

lsdyna_mpp_dp_msm REPNOD 37088 dynkab.F
lsdyna_mpp_dp_msm KEYWRD 12115 dynkaa.F
lsdyna_mpp_dp_msm LSINPUT 1482 dynm.F

I have tested both the MPP and SMP executables, and the same issue occurs, so it does not appear to be MPI-specific.

Could anyone please advise whether iter1.algo should always be generated automatically after iteration 1? Is this a known issue with *CONTROL_REFERENCE_CONFIGURATION in the 2025 R2 Windows build?

Any guidance would be greatly appreciated. I understand the issue with this keyword has been brought up some time ago - may I inquire about any fix since then, or any successful examples to share? I can provide the input and iteration output files, in any feasible way, if required.

Thank you.