Ideas for smoothing solid-flex contacts (PSHELL)?

Attached model drags a simple block across a simple flexible plate's surface. Force is too unsteady to be of any use. Even with flexbody rigid, force is unsteady.

I've noticed using SI2 solver dramatically helps, but hoping someone out there has other tricks up their sleeve (other than just softening the contact parameters).

Attached Files (2)

plate_test.zip

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0 erik_spe over 3 years ago
Thanks for your responses.

Didn't see quite the same,

From "v0" (1st picture), was not matching

From "v0_refined", it was similar, but not quite as good (2nd picture).--this was with the flexbody set to rigid.

Using 2019.2--probably older than yours--all other solver settings should be default.

Anyway, fine at leaving it at this. Takeaways for me are that sliding contact, even for VERY SIMPLE models, requires significant changes to solver settings (10e6 lower-than-default ERROR, etc). Shouldn't be surprised if the converged ERROR/HMAX results in long run times, also shouldn't expect any Hertzian-based contact parameters to work well, as biasing towards lower stiffness will significantly assist convergence. If other approaches (such as using spheres) are applicable, then that's an obvious route to go, as long as the tradeoff with geometric accuracy is acceptable, weighted against run time.
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0 erik_spe over 3 years ago
Thanks for your responses.

Didn't see quite the same,

From "v0" (1st picture), was not matching

From "v0_refined", it was similar, but not quite as good (2nd picture).--this was with the flexbody set to rigid.

Using 2019.2--probably older than yours--all other solver settings should be default.

Anyway, fine at leaving it at this. Takeaways for me are that sliding contact, even for VERY SIMPLE models, requires significant changes to solver settings (10e6 lower-than-default ERROR, etc). Shouldn't be surprised if the converged ERROR/HMAX results in long run times, also shouldn't expect any Hertzian-based contact parameters to work well, as biasing towards lower stiffness will significantly assist convergence. If other approaches (such as using spheres) are applicable, then that's an obvious route to go, as long as the tradeoff with geometric accuracy is acceptable, weighted against run time.
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