dimension x y z
p is periodic n is non-periodic
boundary p p n
Set the style of boundaries for the global simulation box in each dimension. The size of the simulation box is set by the create_box or read_sites commands.
The style p means the box is periodic in that dimension, so that sites can interact across the boundary.
The styles n means the box is non-periodic in that dimension, so that sties do not interact across the boundary.
Note that the interaction of a pair of neighboring sites is really controlled by each of their neighbor lists which are setup by either the create_sites or read sites commands. It is possible to have a periodic system with sites that do not interact across the periodic boundary, because of the way the neighbor lists of sites near the boundary are setup. See the create_sites or read sites for details.
IMPORTANT NOTE: The boundary command does not yet work with off-lattice applications.
This command must be used before the simulation box is defined by a read_sites or create_box command.
A 2d simulation must be periodic in the z dimesion. A 1d simulation must be periodic in the y and z dimensions.
boundary p p p