[lammps-users] LAMMPS geometry import // LAMMPS-FEM coupling

I don't know about LibMultiScale - but you can ask Reese Jones (rjones
at sandia.gov)
about the FEM-LAMMPS coupling.

There is no capability to input a general CAD geometry as a boundary for
granular simulations. But a "fix" could be written to do this. The
would be, if it contains lots of "geometry", e.g. 100K triangles, as opposed
to 3 primitives, then it would require some thought as to how to interact
the geometry with the particles in an efficient manner.