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git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@9240 f3b2605a-c512-4ea7-a41b-209d697bcdaa

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sjplimp 2013-01-05 00:48:13 +00:00
parent 9934c92093
commit b72f03d427
2 changed files with 27 additions and 1 deletions
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14
doc/fix_heat.html
View File

@ -23,6 +23,8 @@
<LI>eflux = rate of heat addition or subtraction (energy/time units)
<LI>eflux can be a variable (see below)
<LI>zero or more keyword/value pairs may be appended to args
<LI>keyword = <I>region</I>
@ -35,6 +37,7 @@
<P><B>Examples:</B>
</P>
<PRE>fix 3 qin heat 1 1.0
fix 3 qin heat 10 v_flux
fix 4 qout heat 1 -1.0 region top
</PRE>
<P><B>Description:</B>
@ -62,6 +65,17 @@ time the fix is invoked. If heat is subtracted from the system too
aggressively so that the group's kinetic energy would go to zero,
LAMMPS halts with an error message.
</P>
<P>The <I>eflux</I> parameter can be specified as an equal-style
<A HREF = "variable.html">variable</A>. If the value is a variable, it should be
specified as v_name, where name is the variable name. In this case,
the variable will be evaluated each timestep, and its value used to
determine the flux.
</P>
<P>Equal-style variables can specify formulas with various mathematical
functions, and include <A HREF = "thermo_style.html">thermo_style</A> command
keywords for the simulation box parameters and timestep and elapsed
time. Thus it is easy to specify a time-dependent flux.
</P>
<P>Fix heat is different from a thermostat such as <A HREF = "fix_nh.html">fix nvt</A>
or <A HREF = "fix_temp_rescale.html">fix temp/rescale</A> in that energy is
added/subtracted continually. Thus if there isn't another mechanism

14
doc/fix_heat.txt
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@ -16,6 +16,7 @@ ID, group-ID are documented in "fix"_fix.html command :ulb,l
heat = style name of this fix command :l
N = add/subtract heat every this many timesteps :l
eflux = rate of heat addition or subtraction (energy/time units) :l
eflux can be a variable (see below) :l
zero or more keyword/value pairs may be appended to args :l
keyword = {region} :l
{region} value = region-ID
@ -25,6 +26,7 @@ keyword = {region} :l
[Examples:]
fix 3 qin heat 1 1.0
fix 3 qin heat 10 v_flux
fix 4 qout heat 1 -1.0 region top :pre
[Description:]
@ -52,6 +54,17 @@ time the fix is invoked. If heat is subtracted from the system too
aggressively so that the group's kinetic energy would go to zero,
LAMMPS halts with an error message.
The {eflux} parameter can be specified as an equal-style
"variable"_variable.html. If the value is a variable, it should be
specified as v_name, where name is the variable name. In this case,
the variable will be evaluated each timestep, and its value used to
determine the flux.
Equal-style variables can specify formulas with various mathematical
functions, and include "thermo_style"_thermo_style.html command
keywords for the simulation box parameters and timestep and elapsed
time. Thus it is easy to specify a time-dependent flux.
Fix heat is different from a thermostat such as "fix nvt"_fix_nh.html
or "fix temp/rescale"_fix_temp_rescale.html in that energy is
added/subtracted continually. Thus if there isn't another mechanism
@ -90,4 +103,3 @@ minimization"_minimize.html.
temp/region"_compute_temp_region.html
[Default:] none