Help with contact #17780
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I've been playing unsuccessfully with contact for a few days now, its seems that for a given contact problem if I'm using displacement based input, i.e. I drive the bodies into contact by enforcing a time based displacment things generally work fine. When I come to do this with a force instead, I have immediate convergence failures. Could someone confirm the steps I should go through to turn a displacement based problem, into a force based problem? Take the example in modules/contact/test/tests/ring_contact, i turned this into a force based example and I have immediate convergence fails and -ve jacobians, usually the elements become hugely deformed (presumably) since they have a very large -ve y coordinate, e.g. I did this using a nodal kernel on my real problem, and a body force on this one. Maybe I'm missing something fundamental? |
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Replies: 1 comment 8 replies
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@lindsayad Can you help out please? |
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@lindsayad Can you help out please?