[lammps-users] liquid layer on wall/reflect or wall/lj93

I am trying to create an Lennard-Jones system with a ayer of liquid
approx 50 sigma deep sitting on top of a solid at the very bottom of
the simulation domain.

Despite my efforts the liquid layer always acquires a velocity upwards
away from the wall (i.e. the whole slab moves up as one)

I have tried the following configurations: