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lammps/doc/src/pair_sph_idealgas.txt
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pair_sph_idealgas.txt
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"LAMMPS WWW Site"_lws - "LAMMPS Documentation"_ld - "LAMMPS Commands"_lc :c
:link(lws,http://lammps.sandia.gov)
:link(ld,Manual.html)
:link(lc,Section_commands.html#comm)
:line
pair_style sph/idealgas command :h3
[Syntax:]
pair_style sph/idealgas :pre
[Examples:]
pair_style sph/idealgas
pair_coeff * * 1.0 2.4 :pre
[Description:]
The sph/idealgas style computes pressure forces between particles
according to the ideal gas equation of state:
:c,image(Eqs/pair_sph_ideal.jpg)
where gamma = 1.4 is the heat capacity ratio, rho is the local
density, and e is the internal energy per unit mass. This pair style
also computes Monaghan's artificial viscosity to prevent particles
from interpentrating "(Monaghan)"_#ideal-Monoghan.
See "this PDF guide"_USER/sph/SPH_LAMMPS_userguide.pdf to using SPH in
LAMMPS.
The following coefficients must be defined for each pair of atoms
types via the "pair_coeff"_pair_coeff.html command as in the examples
above.
nu artificial viscosity (no units)
h kernel function cutoff (distance units) :ul
:line
[Mixing, shift, table, tail correction, restart, rRESPA info]:
This style does not support mixing. Thus, coefficients for all
I,J pairs must be specified explicitly.
This style does not support the "pair_modify"_pair_modify.html
shift, table, and tail options.
This style does not write information to "binary restart
files"_restart.html. Thus, you need to re-specify the pair_style and
pair_coeff commands in an input script that reads a restart file.
This style can only be used via the {pair} keyword of the "run_style
respa"_run_style.html command. It does not support the {inner},
{middle}, {outer} keywords.
[Restrictions:]
This pair style is part of the USER-SPH package. It is only enabled
if LAMMPS was built with that package. See the "Making
LAMMPS"_Section_start.html#start_3 section for more info.
[Related commands:]
"pair_coeff"_pair_coeff.html, pair_sph/rhosum
[Default:] none
:line
:link(ideal-Monoghan)
[(Monaghan)] Monaghan and Gingold, Journal of Computational Physics,
52, 374-389 (1983).
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