fix sph command
fix ID group-ID sph
ID, group-ID are documented in fix command
sph = style name of this fix command
fix 1 all sph
Perform time integration to update position, velocity, internal energy and local density for atoms in the group each timestep. This fix is needed to time-integrate SPH systems where particles carry internal variables such as internal energy. SPH stands for Smoothed Particle Hydrodynamics.
See this PDF guide to using SPH in LAMMPS.
Restart, fix_modify, output, run start/stop, minimize info
No information about this fix is written to binary restart files. None of the fix_modify options are relevant to this fix. No global or per-atom quantities are stored by this fix for access by various output commands. No parameter of this fix can be used with the start/stop keywords of the run command. This fix is not invoked during energy minimization.
This fix is part of the USER-SPH package. It is only enabled if LAMMPS was built with that package. See the Build package doc page for more info.