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<div class="section" id="example-problems">
<h1>7. Example problems<a class="headerlink" href="#example-problems" title="Permalink to this headline"></a></h1>
<p>The LAMMPS distribution includes an examples sub-directory with
several sample problems. Each problem is in a sub-directory of its
own. Most are 2d models so that they run quickly, requiring at most a
couple of minutes to run on a desktop machine. Each problem has an
input script (in.*) and produces a log file (log.*) and dump file
(dump.*) when it runs. Some use a data file (data.*) of initial
coordinates as additional input. A few sample log file outputs on
different machines and different numbers of processors are included in
the directories to compare your answers to. E.g. a log file like
log.crack.foo.P means it ran on P processors of machine &#8220;foo&#8221;.</p>
<p>For examples that use input data files, many of them were produced by
<a class="reference external" href="http://pizza.sandia.gov">Pizza.py</a> or setup tools described in the
<a class="reference internal" href="Section_tools.html"><em>Additional Tools</em></a> section of the LAMMPS
documentation and provided with the LAMMPS distribution.</p>
<p>If you uncomment the <a class="reference internal" href="dump.html"><em>dump</em></a> command in the input script, a
text dump file will be produced, which can be animated by various
<a class="reference external" href="http://lammps.sandia.gov/viz.html">visualization programs</a>. It can
also be animated using the xmovie tool described in the <a class="reference internal" href="Section_tools.html"><em>Additional Tools</em></a> section of the LAMMPS documentation.</p>
<p>If you uncomment the <a class="reference internal" href="dump.html"><em>dump image</em></a> command in the input
script, and assuming you have built LAMMPS with a JPG library, JPG
snapshot images will be produced when the simulation runs. They can
be quickly post-processed into a movie using commands described on the
<a class="reference internal" href="dump_image.html"><em>dump image</em></a> doc page.</p>
<p>Animations of many of these examples can be viewed on the Movies
section of the <a class="reference external" href="http://lammps.sandia.gov">LAMMPS WWW Site</a>.</p>
<p>These are the sample problems in the examples sub-directories:</p>
<table border="1" class="docutils">
<colgroup>
<col width="15%" />
<col width="85%" />
</colgroup>
<tbody valign="top">
<tr class="row-odd"><td>balance</td>
<td>dynamic load balancing, 2d system</td>
</tr>
<tr class="row-even"><td>body</td>
<td>body particles, 2d system</td>
</tr>
<tr class="row-odd"><td>colloid</td>
<td>big colloid particles in a small particle solvent, 2d system</td>
</tr>
<tr class="row-even"><td>comb</td>
<td>models using the COMB potential</td>
</tr>
<tr class="row-odd"><td>crack</td>
<td>crack propagation in a 2d solid</td>
</tr>
<tr class="row-even"><td>cuda</td>
<td>use of the USER-CUDA package for GPU acceleration</td>
</tr>
<tr class="row-odd"><td>dipole</td>
<td>point dipolar particles, 2d system</td>
</tr>
<tr class="row-even"><td>dreiding</td>
<td>methanol via Dreiding FF</td>
</tr>
<tr class="row-odd"><td>eim</td>
<td>NaCl using the EIM potential</td>
</tr>
<tr class="row-even"><td>ellipse</td>
<td>ellipsoidal particles in spherical solvent, 2d system</td>
</tr>
<tr class="row-odd"><td>flow</td>
<td>Couette and Poiseuille flow in a 2d channel</td>
</tr>
<tr class="row-even"><td>friction</td>
<td>frictional contact of spherical asperities between 2d surfaces</td>
</tr>
<tr class="row-odd"><td>gpu</td>
<td>use of the GPU package for GPU acceleration</td>
</tr>
<tr class="row-even"><td>hugoniostat</td>
<td>Hugoniostat shock dynamics</td>
</tr>
<tr class="row-odd"><td>indent</td>
<td>spherical indenter into a 2d solid</td>
</tr>
<tr class="row-even"><td>intel</td>
<td>use of the USER-INTEL package for CPU or Intel(R) Xeon Phi(TM) coprocessor</td>
</tr>
<tr class="row-odd"><td>kim</td>
<td>use of potentials in Knowledge Base for Interatomic Models (KIM)</td>
</tr>
<tr class="row-even"><td>line</td>
<td>line segment particles in 2d rigid bodies</td>
</tr>
<tr class="row-odd"><td>meam</td>
<td>MEAM test for SiC and shear (same as shear examples)</td>
</tr>
<tr class="row-even"><td>melt</td>
<td>rapid melt of 3d LJ system</td>
</tr>
<tr class="row-odd"><td>micelle</td>
<td>self-assembly of small lipid-like molecules into 2d bilayers</td>
</tr>
<tr class="row-even"><td>min</td>
<td>energy minimization of 2d LJ melt</td>
</tr>
<tr class="row-odd"><td>msst</td>
<td>MSST shock dynamics</td>
</tr>
<tr class="row-even"><td>nb3b</td>
<td>use of nonbonded 3-body harmonic pair style</td>
</tr>
<tr class="row-odd"><td>neb</td>
<td>nudged elastic band (NEB) calculation for barrier finding</td>
</tr>
<tr class="row-even"><td>nemd</td>
<td>non-equilibrium MD of 2d sheared system</td>
</tr>
<tr class="row-odd"><td>obstacle</td>
<td>flow around two voids in a 2d channel</td>
</tr>
<tr class="row-even"><td>peptide</td>
<td>dynamics of a small solvated peptide chain (5-mer)</td>
</tr>
<tr class="row-odd"><td>peri</td>
<td>Peridynamic model of cylinder impacted by indenter</td>
</tr>
<tr class="row-even"><td>pour</td>
<td>pouring of granular particles into a 3d box, then chute flow</td>
</tr>
<tr class="row-odd"><td>prd</td>
<td>parallel replica dynamics of vacancy diffusion in bulk Si</td>
</tr>
<tr class="row-even"><td>qeq</td>
<td>use of the QEQ pacakge for charge equilibration</td>
</tr>
<tr class="row-odd"><td>reax</td>
<td>RDX and TATB models using the ReaxFF</td>
</tr>
<tr class="row-even"><td>rigid</td>
<td>rigid bodies modeled as independent or coupled</td>
</tr>
<tr class="row-odd"><td>shear</td>
<td>sideways shear applied to 2d solid, with and without a void</td>
</tr>
<tr class="row-even"><td>snap</td>
<td>NVE dynamics for BCC tantalum crystal using SNAP potential</td>
</tr>
<tr class="row-odd"><td>srd</td>
<td>stochastic rotation dynamics (SRD) particles as solvent</td>
</tr>
<tr class="row-even"><td>tad</td>
<td>temperature-accelerated dynamics of vacancy diffusion in bulk Si</td>
</tr>
<tr class="row-odd"><td>tri</td>
<td>triangular particles in rigid bodies</td>
</tr>
</tbody>
</table>
<p>Here is how you might run and visualize one of the sample problems:</p>
<div class="highlight-python"><div class="highlight"><pre>cd indent
cp ../../src/lmp_linux . # copy LAMMPS executable to this dir
lmp_linux &lt; in.indent # run the problem
</pre></div>
</div>
<p>Running the simulation produces the files <em>dump.indent</em> and
<em>log.lammps</em>. You can visualize the dump file as follows:</p>
<div class="highlight-python"><div class="highlight"><pre>../../tools/xmovie/xmovie -scale dump.indent
</pre></div>
</div>
<p>If you uncomment the <a class="reference internal" href="dump_image.html"><em>dump image</em></a> line(s) in the input
script a series of JPG images will be produced by the run. These can
be viewed individually or turned into a movie or animated by tools
like ImageMagick or QuickTime or various Windows-based tools. See the
<a class="reference internal" href="dump_image.html"><em>dump image</em></a> doc page for more details. E.g. this
Imagemagick command would create a GIF file suitable for viewing in a
browser.</p>
<div class="highlight-python"><div class="highlight"><pre>% convert -loop 1 *.jpg foo.gif
</pre></div>
</div>
<hr class="docutils" />
<p>There is also a COUPLE directory with examples of how to use LAMMPS as
a library, either by itself or in tandem with another code or library.
See the COUPLE/README file to get started.</p>
<p>There is also an ELASTIC directory with an example script for
computing elastic constants, using a zero temperature Si example. See
the in.elastic file for more info.</p>
<p>There is also a USER directory which contains subdirectories of
user-provided examples for user packages. See the README files in
those directories for more info. See the
<a class="reference internal" href="Section_start.html"><em>Section_start.html</em></a> file for more info about user
packages.</p>
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