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<div class="section" id="fix-eos-cv-command">
<span id="index-0"></span><h1>fix eos/cv command<a class="headerlink" href="#fix-eos-cv-command" title="Permalink to this headline"></a></h1>
<div class="section" id="syntax">
<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 eos/cv cv
</pre></div>
</div>
<ul class="simple">
<li>ID, group-ID are documented in <a class="reference internal" href="fix.html"><em>fix</em></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<a class="headerlink" href="#examples" title="Permalink to this headline"></a></h2>
<div class="highlight-python"><div class="highlight"><pre>fix 1 all eos/cv 0.01
</pre></div>
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<div class="section" id="description">
<h2>Description<a class="headerlink" href="#description" title="Permalink to this headline"></a></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>
<hr class="docutils" />
<div class="section" id="restrictions">
<h2>Restrictions<a class="headerlink" href="#restrictions" title="Permalink to this headline"></a></h2>
<p>The fix <em>eos/cv</em> is only available if LAMMPS is built with the
USER-DPD package.</p>
</div>
<div class="section" id="related-commands">
<h2>Related commands<a class="headerlink" href="#related-commands" title="Permalink to this headline"></a></h2>
<p><a class="reference internal" href="fix_shardlow.html"><em>fix shardlow</em></a>, <a class="reference internal" href="pair_dpd_fdt.html"><em>pair dpd/fdt</em></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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