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<div class="section" id="fix-nve-body-command">
<span id="index-0"></span><h1>fix nve/body 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">nve</span><span class="o">/</span><span class="n">body</span>
</pre></div>
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<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>nve/body = style name of this fix command</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">nve</span><span class="o">/</span><span class="n">body</span>
</pre></div>
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<div class="section" id="description">
<h2>Description</h2>
<p>Perform constant NVE integration to update position, velocity,
orientation, and angular velocity for body particles in the group each
timestep. V is volume; E is energy. This creates a system trajectory
consistent with the microcanonical ensemble. See <a class="reference internal" href="Section_howto.html#howto-14"><span class="std std-ref">Section_howto 14</span></a> of the manual and the <a class="reference internal" href="body.html"><span class="doc">body</span></a>
doc page for more details on using body particles.</p>
<p>This fix differs from the <a class="reference internal" href="fix_nve.html"><span class="doc">fix nve</span></a> command, which
assumes point particles and only updates their position and velocity.</p>
</div>
<div class="section" id="restart-fix-modify-output-run-start-stop-minimize-info">
<h2>Restart, fix_modify, output, run start/stop, minimize info</h2>
<p>No information about this fix is written to <a class="reference internal" href="restart.html"><span class="doc">binary restart files</span></a>. None of the <a class="reference internal" href="fix_modify.html"><span class="doc">fix_modify</span></a> options
are relevant to this fix. No global or per-atom quantities are stored
by this fix for access by various <a class="reference internal" href="Section_howto.html#howto-15"><span class="std std-ref">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"><span class="doc">run</span></a> command.
This fix is not invoked during <a class="reference internal" href="minimize.html"><span class="doc">energy minimization</span></a>.</p>
</div>
<div class="section" id="restrictions">
<h2>Restrictions</h2>
<p>This fix is part of the BODY 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 fix requires that atoms store torque and angular momementum and a
quaternion as defined by the <a class="reference internal" href="atom_style.html"><span class="doc">atom_style body</span></a>
command.</p>
<p>All particles in the group must be body particles. They cannot be
point particles.</p>
</div>
<div class="section" id="related-commands">
<h2>Related commands</h2>
<p><a class="reference internal" href="fix_nve.html"><span class="doc">fix nve</span></a>, <a class="reference internal" href="fix_nve_sphere.html"><span class="doc">fix nve/sphere</span></a>, <a class="reference internal" href="fix_nve_asphere.html"><span class="doc">fix nve/asphere</span></a></p>
<p><strong>Default:</strong> none</p>
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