Fix wall/lj126 command!!!

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1

Hi Dear LAMMPS users

Why doesn’t work fix wall/lj126 in simulations!!?

for Example ,if I simulate Poiseuille flow and replace this command instead of Wall Molecules , I don’t get appropriate results (like Velocity Profile)?? i get negative Pressure!!

Thanks a lot from your attention

Iman Tasdighi

2

hi iman,

please calm down. there is no need to use that
many exclamation marks or question marks.

Hi Dear LAMMPS users

Why doesn't work fix wall/lj126 in simulations!!?

it does work fine.

for Example ,if I simulate Poiseuille flow and replace this command instead
of Wall Molecules , I don't get appropriate results (like Velocity
Profile)?? i get negative Pressure!!

the wall potential does what it says it does.
it has no roughness, so please explain why
it should induce a velocity profile?

if you get a negative pressure, you are likely
not using it right. however, if you are not using
a feature correctly, that doesn't automatically
mean that this feature is broken. please keep
that in mind.

thanks,
    axel.