forked from lijiext/lammps
55 lines
1.7 KiB
Plaintext
55 lines
1.7 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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fix nve/noforce command :h3
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[Syntax:]
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fix ID group-ID nve :pre
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ID, group-ID are documented in "fix"_fix.html command
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nve/noforce = style name of this fix command :ul
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[Examples:]
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fix 3 wall nve/noforce :pre
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[Description:]
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Perform updates of position, but not velocity for atoms in the group
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each timestep. In other words, the force on the atoms is ignored and
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their velocity is not updated. The atom velocities are used to update
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their positions.
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This can be useful for wall atoms, when you set their velocities, and
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want the wall to move (or stay stationary) in a prescribed fashion.
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This can also be accomplished via the "fix setforce"_fix_setforce.html
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command, but with fix nve/noforce, the forces on the wall atoms are
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unchanged, and can thus be printed by the "dump"_dump.html command or
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queried with an equal-style "variable"_variable.html that uses the
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fcm() group function to compute the total force on the group of atoms.
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[Restart, fix_modify, output, run start/stop, minimize info:]
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No information about this fix is written to "binary restart
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files"_restart.html. None of the "fix_modify"_fix_modify.html options
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are relevant to this fix. No global or per-atom quantities are stored
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by this fix for access by various "output
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commands"_Section_howto.html#howto_15. No parameter of this fix can
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be used with the {start/stop} keywords of the "run"_run.html command.
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This fix is not invoked during "energy minimization"_minimize.html.
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[Restrictions:] none
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[Related commands:]
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"fix nve"_fix_nve.html
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[Default:] none
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