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git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@2882 f3b2605a-c512-4ea7-a41b-209d697bcdaa

This commit is contained in:
sjplimp 2009-06-22 20:49:14 +00:00
parent 62e09ef511
commit 1008b2d820
2 changed files with 38 additions and 18 deletions

28
doc/fix_freeze.html
View File

@ -25,17 +25,27 @@
<P><B>Description:</B>
</P>
<P>Zero out the force and torque on a granular particle. This is useful
for preventing certain particles from moving in a simulation.
for preventing certain particles from moving in a simulation. The
<A HREF = "pair_gran.html">granular pair styles</A> also detect if this fix has been
defined and compute interactions between frozen and non-frozen
particles appropriately, as if the frozen particle has infinite mass.
</P>
<P><B>Restart, fix_modify, output, run start/stop, minimize info:</B>
</P>
<P>No information about this fix is written to <A HREF = "restart.html">binary restart
files</A>. None of the <A HREF = "fix_modify.html">fix_modify</A> options
are relevant to this fix. No global scalar or vector or per-atom
quantities are stored by this fix for access by various <A HREF = "Section_howto.html#4_15">output
commands</A>. No parameter of this fix can be
used with the <I>start/stop</I> keywords of the <A HREF = "run.html">run</A> command.
This fix is not invoked during <A HREF = "minimize.html">energy minimization</A>.
are relevant to this fix.
</P>
<P>This fix computes a 3-vector of forces, which can be accessed by
various <A HREF = "Section_howto.html#4_15">output commands</A>. This is the total
force on the group of atoms before the forces on individual atoms are
changed by the fix. The vector values calculated by this fix are
"extensive", meaning they scale with the number of atoms in the
simulation.
</P>
<P>No parameter of this fix can be used with the <I>start/stop</I> keywords of
the <A HREF = "run.html">run</A> command. This fix is not invoked during <A HREF = "minimize.html">energy
minimization</A>.
</P>
<P><B>Restrictions:</B>
</P>
@ -44,9 +54,9 @@ LAMMPS was built with that package. See the <A HREF = "Section_start.html#2_3">
LAMMPS</A> section for more info.
</P>
<P>There can only be a single freeze fix defined. This is because other
parts of the code (pair potentials, thermodynamics, etc) treat frozen
particles differently and need to be able to reference a single group
to which this fix is applied.
the <A HREF = "pair_gran.html">granular pair styles</A> treat frozen particles
differently and need to be able to reference a single group to which
this fix is applied.
</P>
<P><B>Related commands:</B> none
</P>

28
doc/fix_freeze.txt
View File

@ -22,17 +22,27 @@ fix 2 bottom freeze :pre
[Description:]
Zero out the force and torque on a granular particle. This is useful
for preventing certain particles from moving in a simulation.
for preventing certain particles from moving in a simulation. The
"granular pair styles"_pair_gran.html also detect if this fix has been
defined and compute interactions between frozen and non-frozen
particles appropriately, as if the frozen particle has infinite mass.
[Restart, fix_modify, output, run start/stop, minimize info:]
No information about this fix is written to "binary restart
files"_restart.html. None of the "fix_modify"_fix_modify.html 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"_Section_howto.html#4_15. No parameter of this fix can be
used with the {start/stop} keywords of the "run"_run.html command.
This fix is not invoked during "energy minimization"_minimize.html.
are relevant to this fix.
This fix computes a 3-vector of forces, which can be accessed by
various "output commands"_Section_howto.html#4_15. This is the total
force on the group of atoms before the forces on individual atoms are
changed by the fix. The vector values calculated by this fix are
"extensive", meaning they scale with the number of atoms in the
simulation.
No parameter of this fix can be used with the {start/stop} keywords of
the "run"_run.html command. This fix is not invoked during "energy
minimization"_minimize.html.
[Restrictions:]
@ -41,9 +51,9 @@ LAMMPS was built with that package. See the "Making
LAMMPS"_Section_start.html#2_3 section for more info.
There can only be a single freeze fix defined. This is because other
parts of the code (pair potentials, thermodynamics, etc) treat frozen
particles differently and need to be able to reference a single group
to which this fix is applied.
the "granular pair styles"_pair_gran.html treat frozen particles
differently and need to be able to reference a single group to which
this fix is applied.
[Related commands:] none