USER/sph/water_collapse initial data

Good morning,

I can run the sph/water_collapse example using LAMMPS (16 Jul 2018).
For testing purposes, i would like to decrease/increase the number of
atoms in:
https://github.com/lammps/lammps/blob/master/examples/USER/sph/water_collapse/data.initial

I could not find how to do this in SPH_LAMMPS_userguide.pdf.
Could you point me to some documentation please ?

Regards,

jg.

Good morning,

I can run the sph/water_collapse example using LAMMPS (16 Jul 2018).
For testing purposes, i would like to decrease/increase the number of
atoms in:
https://github.com/lammps/lammps/blob/master/examples/USER/sph/water_collapse/data.initial

I could not find how to do this in SPH_LAMMPS_userguide.pdf.
Could you point me to some documentation please ?

decreasing the number of particles (this is a mesoscale model, so they
are not atoms) would require either creating a new data file or
deleting particles (e.g. through defining a region and using the
delete_atoms command). the data file format is described in the
documentation for the read_data command.

increasing the number of particles can be done via the replicate
command. however, only the z-direction is periodic, so you can only
use replication in z-direction. in that case, you probably want to
check out the settings of the processors command and also perhaps
consider enabling load balancing for optimal performance.

axel.