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<div class="section" id="compute-erotate-sphere-command">
<span id="index-0"></span><h1>compute erotate/sphere command</h1>
<div class="section" id="syntax">
<h2>Syntax</h2>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">compute</span> <span class="n">ID</span> <span class="n">group</span><span class="o">-</span><span class="n">ID</span> <span class="n">erotate</span><span class="o">/</span><span class="n">sphere</span>
</pre></div>
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<ul class="simple">
<li>ID, group-ID are documented in <a class="reference internal" href="compute.html"><span class="doc">compute</span></a> command</li>
<li>erotate/sphere = style name of this compute 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">compute</span> <span class="mi">1</span> <span class="nb">all</span> <span class="n">erotate</span><span class="o">/</span><span class="n">sphere</span>
</pre></div>
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<div class="section" id="description">
<h2>Description</h2>
<p>Define a computation that calculates the rotational kinetic energy of
a group of spherical particles.</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>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">For <a class="reference internal" href="dimension.html"><span class="doc">2d models</span></a>, particles are treated as
spheres, not disks, meaning their moment of inertia will be the same
as in 3d.</p>
</div>
<p><strong>Output info:</strong></p>
<p>This compute calculates a global scalar (the KE). This value can be
used by any command that uses a global scalar value from a compute as
input. See <a class="reference internal" href="Section_howto.html#howto-15"><span class="std std-ref">Section_howto 15</span></a> for an
overview of LAMMPS output options.</p>
<p>The scalar value calculated by this compute is &#8220;extensive&#8221;. The
scalar value will be in energy <a class="reference internal" href="units.html"><span class="doc">units</span></a>.</p>
</div>
<div class="section" id="restrictions">
<h2>Restrictions</h2>
<p>This compute requires that atoms store a radius and angular velocity
(omega) as defined by the <a class="reference internal" href="atom_style.html"><span class="doc">atom_style sphere</span></a> command.</p>
<p>All particles in the group must be finite-size spheres or point
particles. They cannot be aspherical. Point particles will not
contribute to the rotational energy.</p>
</div>
<div class="section" id="related-commands">
<h2>Related commands</h2>
<p><a class="reference internal" href="compute_erotate_asphere.html"><span class="doc">compute erotate/asphere</span></a></p>
<p><strong>Default:</strong> none</p>
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