Beginner in LAMMPS

Hi every one.
I’m a beginner in LAMMPS and want to work DPD. But I have problems with very simple issues. For example I don’t know that how we can set course graining parameter (Nm) in input. Also if we should set mass=1 all the time in LJ units, how can we model different kinds of fluid with different mass?
Thanks

Hi every one.
I’m a beginner in LAMMPS and want to work DPD. But I have problems with very
simple issues. For example I don’t know that how we can set course graining

these are not so much LAMMPS problems, but general issues on
the simulation method. a mailing list is a sad and inefficient replacement
for a proper tutor or textbook. i suggest that you find somebody local
that can explain these issues to you properly and also read up on
relevant textbooks and publications. those do explain these issues,
even if it sometimes takes a second or third look to fully understand it.
but this is the nature of the profession, is it not?

parameter (Nm) in input. Also if we should set mass=1 all the time in LJ

why should you? you have to pick *one* reference mass/sigma/epsilon
and then everything else is relative to that. this is why reduced units
make the most sense, if you have only one kind of particles in your system.

axel.