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<div class="section" id="fix-eos-cv-command">
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<span id="index-0"></span><h1>fix eos/cv command</h1>
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<div class="section" id="syntax">
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<h2>Syntax</h2>
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<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>
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</pre></div>
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</div>
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<ul class="simple">
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<li>ID, group-ID are documented in <a class="reference internal" href="fix.html"><span class="doc">fix</span></a> command</li>
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<li>eos/cv = style name of this fix command</li>
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<li>cv = constant-volume heat capacity (energy/temperature units)</li>
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</ul>
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</div>
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<div class="section" id="examples">
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<h2>Examples</h2>
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<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>
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</pre></div>
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</div>
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</div>
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<div class="section" id="description">
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<h2>Description</h2>
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<p>Fix <em>eos/cv</em> applies a mesoparticle equation of state to relate the
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particle internal energy (u_i) to the particle internal temperature
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(dpdTheta_i). The <em>eos/cv</em> mesoparticle equation of state requires
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the constant-volume heat capacity, and is defined as follows:</p>
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<img alt="_images/fix_eos-cv.jpg" class="align-center" src="_images/fix_eos-cv.jpg" />
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<p>where Cv is the constant-volume heat capacity, u_cond is the internal
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conductive energy, and u_mech is the internal mechanical energy. Note
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that alternative definitions of the mesoparticle equation of state are
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possible.</p>
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<div class="section" id="restrictions">
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<h2>Restrictions</h2>
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<p>The fix <em>eos/cv</em> is only available if LAMMPS is built with the
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USER-DPD package.</p>
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</div>
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<div class="section" id="related-commands">
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<h2>Related commands</h2>
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<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>
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<p><strong>Default:</strong> none</p>
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<hr class="docutils" />
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<p id="larentzos"><strong>(Larentzos)</strong> J.P. Larentzos, J.K. Brennan, J.D. Moore, and
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W.D. Mattson, “LAMMPS Implementation of Constant Energy Dissipative
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Particle Dynamics (DPD-E)”, ARL-TR-6863, U.S. Army Research
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Laboratory, Aberdeen Proving Ground, MD (2014).</p>
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