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git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@2947 f3b2605a-c512-4ea7-a41b-209d697bcdaa

This commit is contained in:
sjplimp 2009-07-02 15:09:14 +00:00
parent 8b75fcb864
commit fd7945cabc
2 changed files with 16 additions and 32 deletions
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24
doc/fix_rigid.html
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@ -171,23 +171,15 @@ degrees-of-freedom removed by each rigid body are accounted for in the
temperature (and pressure) computation, but only if the temperature
group includes all the particles in a particular rigid body.
</P>
<P>For rigid bodies consisting of point particles, a 3d body has 6
degrees of freedom (3 translational, 3 rotational), except for a dimer
which only has 5. A 2d body has 3 degrees of freedom (2
translational, 1 rotational).
<P>A 3d rigid body has 6 degrees of freedom (3 translational, 3
rotational), except for a collection of point particles lying on a
straight line, which has only 5, e.g a dimer. A 2d rigid body has 3
degrees of freedom (2 translational, 1 rotational).
</P>
<P>For rigid bodies containing one or more finite-size particles, a 3d
body has 6 degrees of freedom, while a 2d body has 3.
</P>
<P>IMPORTANT NOTE: A "linear rigid body" is one consisting of 3 or more
point particles in a straight line. Linear rigid bodies in 3d have 5
degrees of freedom (like a dimer) instead of 6, but LAMMPS will not
detect this. Thus if your model contains linear rigid bodies you
should use the <A HREF = "compute_modify.html">compute_modify</A> command to
subtract an additional degree of freedom for each one. You may also
wish to explicitly subtract additional degrees-of-freedom if you use
the <I>force</I> and <I>torque</I> keywords to eliminate certain motions of the
rigid body, as LAMMPS does not do this automatically.
<P>IMPORTANT NOTE: You may wish to explicitly subtract additional
degrees-of-freedom if you use the <I>force</I> and <I>torque</I> keywords to
eliminate certain motions of one or more rigid bodies, as LAMMPS does
not do this automatically.
</P>
<P>The rigid body contribution to the pressure of the system (virial) is
also accounted for by this fix.

24
doc/fix_rigid.txt
View File

@ -162,23 +162,15 @@ degrees-of-freedom removed by each rigid body are accounted for in the
temperature (and pressure) computation, but only if the temperature
group includes all the particles in a particular rigid body.
For rigid bodies consisting of point particles, a 3d body has 6
degrees of freedom (3 translational, 3 rotational), except for a dimer
which only has 5. A 2d body has 3 degrees of freedom (2
translational, 1 rotational).
A 3d rigid body has 6 degrees of freedom (3 translational, 3
rotational), except for a collection of point particles lying on a
straight line, which has only 5, e.g a dimer. A 2d rigid body has 3
degrees of freedom (2 translational, 1 rotational).
For rigid bodies containing one or more finite-size particles, a 3d
body has 6 degrees of freedom, while a 2d body has 3.
IMPORTANT NOTE: A "linear rigid body" is one consisting of 3 or more
point particles in a straight line. Linear rigid bodies in 3d have 5
degrees of freedom (like a dimer) instead of 6, but LAMMPS will not
detect this. Thus if your model contains linear rigid bodies you
should use the "compute_modify"_compute_modify.html command to
subtract an additional degree of freedom for each one. You may also
wish to explicitly subtract additional degrees-of-freedom if you use
the {force} and {torque} keywords to eliminate certain motions of the
rigid body, as LAMMPS does not do this automatically.
IMPORTANT NOTE: You may wish to explicitly subtract additional
degrees-of-freedom if you use the {force} and {torque} keywords to
eliminate certain motions of one or more rigid bodies, as LAMMPS does
not do this automatically.
The rigid body contribution to the pressure of the system (virial) is
also accounted for by this fix.