ERROR on proc 0: Non-numeric atom coords - simulation unstable (src/domain.cpp:521)

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1

Dear LAMMPS Users,

I met an issue described as the title while I was simulating a friction process. Can everyone please help me fix it? Attached is the in file.

Thank you,
Steven

in.create (2.7 KB)

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That usually happens when you have atoms that are too close and thus forces become too large.

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Thanks for your reply! Does that mean there may be issues on the model created? Like there could be atoms overlapping or too close to each other?

Thank you

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That is one possible reason for close contacts, yes.

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OK. I got it. I will try to fix it. Thank you very much!!

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A simple test for close contacts in the initial geometry is to add the following line to your input after reading/creating all atoms and defining a pair style and then checking in the log file whether there are atoms deleted.

delete_atoms overlap 0.1 all all

The value of 0.1 needs to be adjusted depending on the units setting.

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7

Yes, I tried this command in my program and it deleted some atoms, which means there are atom overlapping. I think I need to redesign the model creation part to avoid overlapping. Again, thank you so much for your help!!