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<div class="section" id="fix-eos-cv-command">
<span id="index-0"></span><h1>fix eos/cv command</h1>
<div class="section" id="syntax">
<h2>Syntax</h2>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">fix</span> <span class="n">ID</span> <span class="n">group</span><span class="o">-</span><span class="n">ID</span> <span class="n">eos</span><span class="o">/</span><span class="n">cv</span> <span class="n">cv</span>
</pre></div>
</div>
<ul class="simple">
<li>ID, group-ID are documented in <a class="reference internal" href="fix.html"><span class="doc">fix</span></a> command</li>
<li>eos/cv = style name of this fix command</li>
<li>cv = constant-volume heat capacity (energy/temperature units)</li>
</ul>
</div>
<div class="section" id="examples">
<h2>Examples</h2>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">fix</span> <span class="mi">1</span> <span class="nb">all</span> <span class="n">eos</span><span class="o">/</span><span class="n">cv</span> <span class="mf">0.01</span>
</pre></div>
</div>
</div>
<div class="section" id="description">
<h2>Description</h2>
<p>Fix <em>eos/cv</em> applies a mesoparticle equation of state to relate the
particle internal energy (u_i) to the particle internal temperature
(dpdTheta_i). The <em>eos/cv</em> mesoparticle equation of state requires
the constant-volume heat capacity, and is defined as follows:</p>
<img alt="_images/fix_eos-cv.jpg" class="align-center" src="_images/fix_eos-cv.jpg" />
<p>where Cv is the constant-volume heat capacity, u_cond is the internal
conductive energy, and u_mech is the internal mechanical energy. Note
that alternative definitions of the mesoparticle equation of state are
possible.</p>
</div>
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<h2>Restrictions</h2>
<p>This command is part of the USER-DPD package. It is only enabled if
LAMMPS was built with that package. See the <a class="reference internal" href="Section_start.html#start-3"><span class="std std-ref">Making LAMMPS</span></a> section for more info.</p>
<p>This command also requires use of the <a class="reference internal" href="atom_style.html"><span class="doc">atom_style dpd</span></a>
command.</p>
</div>
<div class="section" id="related-commands">
<h2>Related commands</h2>
<p><a class="reference internal" href="fix_shardlow.html"><span class="doc">fix shardlow</span></a>, <a class="reference internal" href="pair_dpd_fdt.html"><span class="doc">pair dpd/fdt</span></a></p>
<p><strong>Default:</strong> none</p>
<hr class="docutils" />
<p id="larentzos"><strong>(Larentzos)</strong> J.P. Larentzos, J.K. Brennan, J.D. Moore, and
W.D. Mattson, &#8220;LAMMPS Implementation of Constant Energy Dissipative
Particle Dynamics (DPD-E)&#8221;, ARL-TR-6863, U.S. Army Research
Laboratory, Aberdeen Proving Ground, MD (2014).</p>
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