[lammps-users] Wall atoms missing!

Hi lammps users,

We are trying to set polymer flow simulations on LAMMPS.
The simulation box has 100 chains, 20 monomer per chain surrounded by
3 layers of wall atoms on either side. When I run using the following script
the upper layer contains only 2 layers of instead of 3 but surprisingly the
number of total atoms remains the same. I don’t have a clue of what is going on.
Atom types 1,2,3 & 4 are polymer molecules in different regions along X-axis
where as 5,6,7 & 8 are wall atoms. Here is the input script and data file. Any help would be greatly appreciated.

Srikanth Dhondi

data.polymer (340 KB)

test.in (408 Bytes)

Your script doesn't define any groups or regions. All the atom
types are hard-wired in the data file. So if the upper vs lower
layer have different numbers of atoms, that's what's in the data file.