error: shake clusters are clusted

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1

When I used the united-atom force field which methyl and methylene groups are considered as one center.but I used the fix shake to constranit the C-C bond, it also shows the error shake clusters are clusted.How should I do to fix the C-C
Eagerly waiting for the reply, and thank you very much!

   Sincerely yours
   Sneaker Bai
2

The fix shake doc page explains the restrictions on how it can be used, i.e.

what it can constrain. There is no current capability in LAMMPS to constrain

all the C-C backbone bonds of a long-chain polymer.

Steve

3

thanks for your reply!