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git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@2943 f3b2605a-c512-4ea7-a41b-209d697bcdaa

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sjplimp
2009-07-02 13:41:57 +00:00
parent 61a1499a13
commit b5bb75bef2
2 changed files with 12 additions and 12 deletions
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12
doc/fix_viscous.html
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@ -62,12 +62,12 @@ This is not the same as mass/time units, at least for some of the
LAMMPS <A HREF = "units.html">units</A> options like "real" or "metal" that are not
self-consistent.
</P>
<P>In a Brownian dynamics context, gamma = kT / D, where k = Boltzmann's
constant, T = temperature, and D = particle diffusion coefficient. D
can be written as kT / (3 pi eta d), where eta = dynamic viscosity of
the frictional fluid and d = diameter of particle. This means gamma =
3 pi eta d, and thus is proportional to the viscosity of the fluid and
the particle diameter.
<P>In a Brownian dynamics context, gamma = Kb T / D, where Kb =
Boltzmann's constant, T = temperature, and D = particle diffusion
coefficient. D can be written as Kb T / (3 pi eta d), where eta =
dynamic viscosity of the frictional fluid and d = diameter of
particle. This means gamma = 3 pi eta d, and thus is proportional to
the viscosity of the fluid and the particle diameter.
</P>
<P>In the current implementation, rather than have the user specify a
viscosity, gamma is specified directly in force/velocity units. If

12
doc/fix_viscous.txt
View File

@ -52,12 +52,12 @@ This is not the same as mass/time units, at least for some of the
LAMMPS "units"_units.html options like "real" or "metal" that are not
self-consistent.
In a Brownian dynamics context, gamma = kT / D, where k = Boltzmann's
constant, T = temperature, and D = particle diffusion coefficient. D
can be written as kT / (3 pi eta d), where eta = dynamic viscosity of
the frictional fluid and d = diameter of particle. This means gamma =
3 pi eta d, and thus is proportional to the viscosity of the fluid and
the particle diameter.
In a Brownian dynamics context, gamma = Kb T / D, where Kb =
Boltzmann's constant, T = temperature, and D = particle diffusion
coefficient. D can be written as Kb T / (3 pi eta d), where eta =
dynamic viscosity of the frictional fluid and d = diameter of
particle. This means gamma = 3 pi eta d, and thus is proportional to
the viscosity of the fluid and the particle diameter.
In the current implementation, rather than have the user specify a
viscosity, gamma is specified directly in force/velocity units. If