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git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@1779 f3b2605a-c512-4ea7-a41b-209d697bcdaa

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sjplimp 2008-04-30 15:16:54 +00:00
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2 changed files with 28 additions and 26 deletions
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27
doc/pair_lubricate.html
View File

@ -39,23 +39,24 @@ spherical particles via this formula from <A HREF = "#Ball">(Ball and Melrose)</
<CENTER><IMG SRC = "Eqs/pair_lubricate.jpg">
</CENTER>
<P>which represents the dissipation W between two nearby particles due to
the background solvent. Rc is the outer cutoff specified in the
pair_style command, the translational velocities of the 2 particles
are v1 and v2, the angular velocities are w1 and w2, and n is the unit
vector in the direction from particle 1 to 2. The 4 terms represent
four modes of pairwise interaction: squeezing, shearing, pumping, and
twisting. The 4 flags in the pair_style command turn on or off each
of these modes by including or excluding each term. The 4
coefficients on each term are functions of the separation distance of
the particles. Details are given in <A HREF = "#Ball">(Ball and Melrose)</A>,
including the forces and torques that result from taking derivatives
of this equation (see Appendix A).
their relative velocities in the presence of a background solvent. Rc
is the outer cutoff specified in the pair_style command, the
translational velocities of the 2 particles are v1 and v2, the angular
velocities are w1 and w2, and n is the unit vector in the direction
from particle 1 to 2. The 4 terms represent four modes of pairwise
interaction: squeezing, shearing, pumping, and twisting. The 4 flags
in the pair_style command turn on or off each of these modes by
including or excluding each term. The 4 coefficients on each term are
functions of the separation distance of the particles. Details are
given in <A HREF = "#Ball">(Ball and Melrose)</A>, including the forces and torques
that result from taking derivatives of this equation with respect to
velocity (see Appendix A).
</P>
<P>Unlike most pair potentials, the two specified cutoffs (cutinner and
cutoff) refer to the surface-to-surface separation between two
particles, not center-to-center distance. Currently, this pair style
can only be used for mono-disperse spheres (same radii), so that
separation is r_ij - 2*radius, where r_ij is the center-to-center
can only be used for mono-disperse extended spheres (same radii), so
that separation is r_ij - 2*radius, where r_ij is the center-to-center
distance between the particles. Within the inner cutoff <I>cutinner</I>,
the forces and torques are evaluated at a separation of cutinner. The
outer <I>cutoff</I> is the separation distance beyond which the pair-wise

27
doc/pair_lubricate.txt
View File

@ -36,23 +36,24 @@ spherical particles via this formula from "(Ball and Melrose)"_#Ball
:c,image(Eqs/pair_lubricate.jpg)
which represents the dissipation W between two nearby particles due to
the background solvent. Rc is the outer cutoff specified in the
pair_style command, the translational velocities of the 2 particles
are v1 and v2, the angular velocities are w1 and w2, and n is the unit
vector in the direction from particle 1 to 2. The 4 terms represent
four modes of pairwise interaction: squeezing, shearing, pumping, and
twisting. The 4 flags in the pair_style command turn on or off each
of these modes by including or excluding each term. The 4
coefficients on each term are functions of the separation distance of
the particles. Details are given in "(Ball and Melrose)"_#Ball,
including the forces and torques that result from taking derivatives
of this equation (see Appendix A).
their relative velocities in the presence of a background solvent. Rc
is the outer cutoff specified in the pair_style command, the
translational velocities of the 2 particles are v1 and v2, the angular
velocities are w1 and w2, and n is the unit vector in the direction
from particle 1 to 2. The 4 terms represent four modes of pairwise
interaction: squeezing, shearing, pumping, and twisting. The 4 flags
in the pair_style command turn on or off each of these modes by
including or excluding each term. The 4 coefficients on each term are
functions of the separation distance of the particles. Details are
given in "(Ball and Melrose)"_#Ball, including the forces and torques
that result from taking derivatives of this equation with respect to
velocity (see Appendix A).
Unlike most pair potentials, the two specified cutoffs (cutinner and
cutoff) refer to the surface-to-surface separation between two
particles, not center-to-center distance. Currently, this pair style
can only be used for mono-disperse spheres (same radii), so that
separation is r_ij - 2*radius, where r_ij is the center-to-center
can only be used for mono-disperse extended spheres (same radii), so
that separation is r_ij - 2*radius, where r_ij is the center-to-center
distance between the particles. Within the inner cutoff {cutinner},
the forces and torques are evaluated at a separation of cutinner. The
outer {cutoff} is the separation distance beyond which the pair-wise