Use of thermo_style fnorm command

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1

Hi all,

Lammps page for thermo_style describes fnorm as length of force vector for all atoms. In case, during my simulation, I apply force (say 10 eV/A) on my simulation box only in one direction (z-axis). Then should the fnorm value be a measure of that applied force, i.e should it be a value close to 10eV/A.

Or does fnorm sums up the force vector on each atom individually?

Thanks and Regards,

2

The force vector for all atoms has 3N components.
Fnorm is the "length" of that vector, or the 2 norm,
which if N = 1 would be sqrt(fx*fx + fy*fy + fz*fz).
So it will not be 10 if N is big.

Steve