forked from lijiext/lammps
80 lines
2.1 KiB
Plaintext
80 lines
2.1 KiB
Plaintext
"LAMMPS WWW Site"_lws - "LAMMPS Documentation"_ld - "LAMMPS Commands"_lc :c
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:link(lws,http://lammps.sandia.gov)
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:link(ld,Manual.html)
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:link(lc,Section_commands.html#comm)
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:line
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pair_style sph/lj command :h3
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[Syntax:]
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pair_style sph/lj :pre
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[Examples:]
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pair_style sph/lj
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pair_coeff * * 1.0 2.4 :pre
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[Description:]
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The sph/lj style computes pressure forces between particles according
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to the Lennard-Jones equation of state, which is computed according to
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Ree's 1980 polynomial fit "(Ree)"_#Ree. The Lennard-Jones parameters
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epsilon and sigma are set to unity. This pair style also computes
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Monaghan's artificial viscosity to prevent particles from
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interpentrating "(Monaghan)"_#Monoghan.
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See "this PDF guide"_USER/sph/SPH_LAMMPS_userguide.pdf to using SPH in
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LAMMPS.
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The following coefficients must be defined for each pair of atoms
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types via the "pair_coeff"_pair_coeff.html command as in the examples
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above.
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nu artificial viscosity (no units)
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h kernel function cutoff (distance units) :ul
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:line
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[Mixing, shift, table, tail correction, restart, rRESPA info]:
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This style does not support mixing. Thus, coefficients for all
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I,J pairs must be specified explicitly.
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This style does not support the "pair_modify"_pair_modify.html
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shift, table, and tail options.
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This style does not write information to "binary restart
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files"_restart.html. Thus, you need to re-specify the pair_style and
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pair_coeff commands in an input script that reads a restart file.
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This style can only be used via the {pair} keyword of the "run_style
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respa"_run_style.html command. It does not support the {inner},
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{middle}, {outer} keywords.
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[Restrictions:]
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As noted above, the Lennard-Jones parameters epsilon and sigma are set
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to unity.
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This pair style is part of the USER-SPH package. It is only enabled
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if LAMMPS was built with that package. See the "Making
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LAMMPS"_Section_start.html#start_3 section for more info.
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[Related commands:]
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"pair_coeff"_pair_coeff.html, pair_sph/rhosum
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[Default:] none
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:line
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:link(Ree)
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[(Ree)] Ree, Journal of Chemical Physics, 73, 5401 (1980).
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:link(Monoghan)
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[(Monaghan)] Monaghan and Gingold, Journal of Computational Physics,
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52, 374-389 (1983).
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