perpendicular pressure

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1

Dear LAMMPS users ,

I have two lennard-jones walls and some molecules between them .

***************************************************** LJ wall

Molecule

****************************************************** LJ wall

I want to calculate perpendicular pressure for this system .
How can I obtain the total force exerted by particles on each wall ?

Regards,
Saeed.

2

Dear Saeed,

For the desired group, you try:

Hope it is useful.

3

If you used a fix wall command, e.g. fix wall/lj93,
to define your walls, then the doc page for the fix
explains that the force of the particles on the wall
is tallied and output by the fix.

Steve

4

Dear Steve and Xiaolin ,

Thanks for your reply .

Regards,
Saeed.