cubic with 4 fixed walls

hello dear
i am simulating a cubic.can anybody introduce a site or a data file for a cubic with 4 fixed walls?has anybody seen sth like it?i need it.thank you
i appreciate anyhelp

Your message is really not very clear. A cubic what? Certainly LAMMPS
has many fixes that represent fixed walls, such as fix wall/reflect.

2015-11-13 12:36 GMT-07:00 Mehdi zarei <[email protected]>: