united atom ff

Dear All users

I want to use united atom force field, Can i use this type of the force

fields?

I suppose that I can use it in this way,

I have to construct my .data file that included united atoms,

For example: C instead of one C and three H(CH3),

Is it true?

Dear All users

I want to use united atom force field, Can i use this type of the force
fields?

yes. for as long as the potential function is supported, LAMMPS
doesn't know and doesn't _care_ what your atoms stand for. If you look
at simulations using peridynamics or smooth particle hydrodynamics
(both supported by LAMMPS), there the "atom" positions have actually
*nothing* to do with atoms at all. they are just sites representing
some property of a continuum.

I suppose that I can use it in this way,

I have to construct my .data file that included united atoms,

For example: C instead of one C and three H(CH3),

Is it true?

yes. but remember to use suitable united atom force field parameters
and don't forget to adjust the mass.

axel.