Error: too many groups

Dear lammps users,

Rencently I am modeling filler-polymer composite. I construct a filler which is similar with one of literature shown in attachment figure. Hence, in order to keep the shape, I treat each filler as a rigid body (I will also do the stretch. So the relative motion between fillers is necessary).

My question is I have plenty of fillers in the system (now 30 60. In future, maybe more). But the group limit in Lammps is 32. How should I solve this problem? Could this limit be changed? Or is there any other method (command) to keep the fillers shape without using potential?

Best
Chi Ma

Graduate student
Mechanical Engineering
The University of Akron

Capture.PNG

Dear lammps users,

Rencently I am modeling filler-polymer composite. I construct a filler which
is similar with one of literature shown in attachment figure. Hence, in
order to keep the shape, I treat each filler as a rigid body (I will also do
the stretch. So the relative motion between fillers is necessary).

My question is I have plenty of fillers in the system (now 30 60. In future,
maybe more). But the group limit in Lammps is 32. How should I solve this
problem? Could this limit be changed? Or is there any other method (command)
to keep the fillers shape without using potential?

the is a frequently asked question with a simple solution: use
molecule ids instead of groups to label your rigid bodies.
please see the documentation and the mailing list archives for more
detailed explanations and comments.

axel.