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### 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

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:

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

Related commands:

pair_style sph/artVisc/tensCorr, fix sph/pressure, fix sph/density/continuity

Default: none

(Liu and Liu, 2003) "Smoothed Particle Hydrodynamics: A Meshfree Particle Method", G. R. Liu and M. B. Liu, World Scientific, p. 449 (2003).