some questions about "kspace ewald"

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1

Can i use it in 2D？If i want to use it in 2d,what should i do?It seems that i cannot use it in 2d in lammps?

2

Can i use it in 2D？

not as such.

If i want to use it in 2d,what should i do?

you would have to program a 2d ewald algorithm into LAMMPS. it would
be a nice addition to LAMMPS.

It seems that i cannot use it in 2d in lammps?

the only option available that is readily implemented into LAMMPS is
to use the slab feature which simulates a 2d system as a 3d system and
then corrects for the (net) interaction across periodic boundaries
using a poisson solver. that is, of course, only an approximation of a
real 2-d ewald.

axel.