fix sph/density/corr command

Syntax

fix ID group-ID sph/density/corr style args

  • ID, group-ID are documented in fix command

  • sph/density/corr = style name of this fix command

  • style = shepard

  • args = list of arguments for a particular style

shepard args = every nSteps
  nSteps = determes number of timesteps

Examples

fix corr all sph/density/corr shepard every 30

LIGGGHTS vs. LAMMPS Info:

This command is not available in LAMMPS.

Description

In general the pressure field in SPH exhibits large oscillations. One approach to overcome this problem is to perform a filter over the density.

The filterstyle shepard is one of the most simple and quick correction. Every nSteps timesteps the following rule is applied:

images/fix_sph_density_corr_eq1.jpg

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 scalar or vector 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.

Restrictions

none