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< title > fix enforce2d command — LAMMPS documentation< / title >
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< li class = "toctree-l1" > < a class = "reference internal" href = "Section_intro.html" > 1. Introduction< / a > < / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "Section_start.html" > 2. Getting Started< / a > < / li >
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< li > fix enforce2d command< / li >
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< a href = "http://lammps.sandia.gov" > Website< / a >
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< span id = "index-0" > < / span > < h1 > fix enforce2d command< a class = "headerlink" href = "#fix-enforce2d-command" title = "Permalink to this headline" > ¶< / a > < / h1 >
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< div class = "section" id = "fix-enforce2d-cuda-command" >
< h1 > fix enforce2d/cuda command< a class = "headerlink" href = "#fix-enforce2d-cuda-command" title = "Permalink to this headline" > ¶< / a > < / h1 >
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< h2 > Syntax< a class = "headerlink" href = "#syntax" title = "Permalink to this headline" > ¶< / a > < / h2 >
< div class = "highlight-python" > < div class = "highlight" > < pre > fix ID group-ID enforce2d
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< li > ID, group-ID are documented in < a class = "reference internal" href = "fix.html" > < em > fix< / em > < / a > command< / li >
< li > enforce2d = style name of this fix command< / li >
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< h2 > Examples< a class = "headerlink" href = "#examples" title = "Permalink to this headline" > ¶< / a > < / h2 >
< div class = "highlight-python" > < div class = "highlight" > < pre > fix 5 all enforce2d
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< h2 > Description< a class = "headerlink" href = "#description" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > Zero out the z-dimension velocity and force on each atom in the group.
This is useful when running a 2d simulation to insure that atoms do
not move from their initial z coordinate.< / p >
< hr class = "docutils" / >
< p > Styles with a < em > cuda< / em > suffix are functionally the same as the
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corresponding style without the suffix. They have been optimized to
run faster, depending on your available hardware, as discussed in
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< a class = "reference internal" href = "Section_accelerate.html" > < em > Section_accelerate< / em > < / a > of the manual. The
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accelerated styles take the same arguments and should produce the same
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results, except for round-off and precision issues.< / p >
< p > These accelerated styles are part of the USER-CUDA package. They are
only enabled if LAMMPS was built with that package. See the < a class = "reference internal" href = "Section_start.html#start-3" > < span > Making LAMMPS< / span > < / a > section for more info.< / p >
< p > You can specify the accelerated styles explicitly in your input script
by including their suffix, or you can use the < a class = "reference internal" href = "Section_start.html#start-7" > < span > -suffix command-line switch< / span > < / a > when you invoke LAMMPS, or you can
use the < a class = "reference internal" href = "suffix.html" > < em > suffix< / em > < / a > command in your input script.< / p >
< p > See < a class = "reference internal" href = "Section_accelerate.html" > < em > Section_accelerate< / em > < / a > of the manual for
more instructions on how to use the accelerated styles effectively.< / p >
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< h2 > Restart, fix_modify, output, run start/stop, minimize info< a class = "headerlink" href = "#restart-fix-modify-output-run-start-stop-minimize-info" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > No information about this fix is written to < a class = "reference internal" href = "restart.html" > < em > binary restart files< / em > < / a > . None of the < a class = "reference internal" href = "fix_modify.html" > < em > fix_modify< / em > < / a > options
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are relevant to this fix. No global or per-atom quantities are stored
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by this fix for access by various < a class = "reference internal" href = "Section_howto.html#howto-15" > < span > output commands< / span > < / a > . No parameter of this fix can
be used with the < em > start/stop< / em > keywords of the < a class = "reference internal" href = "run.html" > < em > run< / em > < / a > command.< / p >
< p > The forces due to this fix are imposed during an energy minimization,
invoked by the < a class = "reference internal" href = "minimize.html" > < em > minimize< / em > < / a > command.< / p >
< / div >
< div class = "section" id = "restrictions" >
< h2 > Restrictions< a class = "headerlink" href = "#restrictions" title = "Permalink to this headline" > ¶< / a > < / h2 >
< blockquote >
< div > none< / div > < / blockquote >
< p > < strong > Related commands:< / strong > none< / p >
< p > < strong > Default:< / strong > none< / p >
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© Copyright 2013 Sandia Corporation.
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