How to loosen the convergence check in OpenRadioss for implicit solver?

[li2qn]

Hey Radioss user,

I am wondering how to loosen the convergence check in OpenRadioss for implicit solver? any keyword I can use? Thanks for help

[li2qn]

Please help

[li2qn]

for example, can I control the ratio of the largest residual to the corresponding average flux norm for convergence? or other convergence criterion parameters I can adjust? Thanks

[li2qn]

any idea on how to do this? Thanks for any help

[GLBrandao]

Hello @li2qn
Maybe this page can help: https://help.altair.com/hwsolvers/rad/topics/solvers/rad/implicit_solutions_intro_engine_r.htm
Specially the implicit solvers page, /IMPL/NONLIN keyword: https://help.altair.com/hwsolvers/rad/topics/solvers/rad/impl_nonlin_engine_r.htm

[li2qn]

Thanks so much. One more question, how can I specify the shell thickness offset directions? like from the center/top/bottom of the shell surfaces?