[gmx-users] Question about "Walls"

[ramon]

Hi,

 I would like to post a question about simulating with "Walls" in gromacs.
The question is very simple. I am trying to simulate a simple box of water molecules with pbc=xy and walls at z=0 and z=z_box. I use Berendsen T-coupling and no pressure bath.
I am trying:

pbc=xy
nwall =2
wall_atomtype = C1 C1   (C1 are the alkane carbons defined in the martini force field file)
wall_type = 9-3
wall_density = 110 110
wall_r_linpot = 1

and all what I have is that the initial box of water molecules breaks in two pieces that separate each other in the z-direction.
The same result (or a segmentation fault) is obtained by using 10-4 o 12-6 LJ potentials, large wall_r_linpot values, other values of wall_densities, so I think that the problem is with the wall_atomtype. I tried the water bead (W) instead, and segmentation fault is obtained.

 thank you very much in advance,

  Ramon


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