This example contains a (crude and somewhat simple) example of 
the translocation of a (rather short) polymer through a hole in a wall, 
surrounded by an explicit LJ solvent.

(I used a short polymer because a longer polymer would require a larger box.
 But this example looked more impressive visually when I used a smaller box.)
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Note: You must compile LAMMPS with the optional "RIGID" package installed. To
      do this, go to the "src" directory of your lammps installation and type:
      make yes-RIGID
      make clean-all
      make NAME_OF_TARGET   #<--("make ubuntu", "make g++", "make linux".)
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Instructions on how to build LAMMPS input files and 
run a short simulation are provided in other README files.

step 1)
README_setup.sh

step2)
README_run.sh