constraining motion of atoms

Dear lammps users,

I want to constrain the motion of thermally vibrated atoms only in the lateral direction (x-y plane), i.e. ignore v_z components.
The simulation should be performed in 3D.
Is there simple way to do it?
Thanks in advance.

Joe

Dear lammps users,

I want to constrain the motion of thermally vibrated atoms only in the lateral direction (x-y plane), i.e. ignore v_z components.
The simulation should be performed in 3D.
Is there simple way to do it?

You can use the velocity command to set the initial z velocities to zero and then fix setforce to keep the z component of the force at zero.

Axel

See the fix planeforce command.

Steve