Lj/cut/coul/cut vs. lj/cut/coul/long

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1

Dear All

I’m new on LAMMPS and don’t understand the physical and computational difference of handling long-range electrostatic interactions through lj/cut/coul/cut or lj/cut/coul/long.
both keywords need a cut-off value to be specified in LAMMPS. http://lammps.sandia.gov/doc/pair_lj.html
Why coul/long needs such parameter?
Any hint is welcome.

2

Dear All
I'm new on LAMMPS and don't understand the physical and computational
difference of handling long-range electrostatic interactions through
lj/cut/coul/cut or lj/cut/coul/long.
both keywords need a cut-off value to be specified in LAMMPS.
http://lammps.sandia.gov/doc/pair_lj.html
Why coul/long needs such parameter?

to separate the real space part from the reciprocal space part.

Any hint is welcome.

please take a good MD text book and read up on ewald summation.
what you are asking about is fundamental classical MD knowledge.

axel.