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<title>compute erotate/sphere/atom command &mdash; LAMMPS 15 May 2015 version documentation</title>
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<div class="section" id="compute-erotate-sphere-atom-command">
<span id="index-0"></span><h1>compute erotate/sphere/atom command<a class="headerlink" href="#compute-erotate-sphere-atom-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>compute ID group-ID erotate/sphere/atom
</pre></div>
</div>
<ul class="simple">
<li>ID, group-ID are documented in <a class="reference internal" href="compute.html"><em>compute</em></a> command</li>
<li>erotate/sphere/atom = style name of this compute command</li>
</ul>
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<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>compute 1 all erotate/sphere/atom
</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>Define a computation that calculates the rotational kinetic energy for
each particle in a group.</p>
<p>The rotational energy is computed as 1/2 I w^2, where I is the moment
of inertia for a sphere and w is the particle&#8217;s angular velocity.</p>
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<p class="first admonition-title">Warning</p>
<p class="last">For <a class="reference internal" href="dimension.html"><em>2d models</em></a>, particles are treated
as spheres, not disks, meaning their moment of inertia will be the
same as in 3d.</p>
</div>
<p>The value of the rotational kinetic energy will be 0.0 for atoms not
in the specified compute group or for point particles with a radius =
0.0.</p>
<p><strong>Output info:</strong></p>
<p>This compute calculates a per-atom vector, which can be accessed by
any command that uses per-atom values from a compute as input. See
<a class="reference internal" href="Section_howto.html#howto-15"><span>Section_howto 15</span></a> for an overview of
LAMMPS output options.</p>
<p>The per-atom vector values will be in energy <a class="reference internal" href="units.html"><em>units</em></a>.</p>
</div>
<div class="section" id="restrictions">
<h2>Restrictions<a class="headerlink" href="#restrictions" title="Permalink to this headline"></a></h2>
<blockquote>
<div>none</div></blockquote>
</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="dump.html"><em>dump custom</em></a></p>
<p><strong>Default:</strong> none</p>
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