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<title>compute erotate/rigid command &mdash; LAMMPS 15 May 2015 version documentation</title>
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<div class="section" id="compute-erotate-rigid-command">
<span id="index-0"></span><h1>compute erotate/rigid command<a class="headerlink" href="#compute-erotate-rigid-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/rigid fix-ID
</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/rigid = style name of this compute command</li>
<li>fix-ID = ID of rigid body fix</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>compute 1 all erotate/rigid myRigid
</pre></div>
</div>
</div>
<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 of
a collection of rigid bodies, as defined by one of the <a class="reference internal" href="fix_rigid.html"><em>fix rigid</em></a> command variants.</p>
<p>The rotational energy of each rigid body is computed as 1/2 I Wbody^2,
where I is the inertia tensor for the rigid body, and Wbody is its
angular velocity vector. Both I and Wbody are in the frame of
reference of the rigid body, i.e. I is diagonalized.</p>
<p>The <em>fix-ID</em> should be the ID of one of the <a class="reference internal" href="fix_rigid.html"><em>fix rigid</em></a>
commands which defines the rigid bodies. The group specified in the
compute command is ignored. The rotational energy of all the rigid
bodies defined by the fix rigid command in included in the
calculation.</p>
<p><strong>Output info:</strong></p>
<p>This compute calculates a global scalar (the summed rotational energy
of all the rigid bodies). 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>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"><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>
<p>This compute is part of the RIGID 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>Making LAMMPS</span></a> section for more info.</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><code class="xref doc docutils literal"><span class="pre">compute</span> <span class="pre">ke/rigid</span></code></p>
<p><strong>Default:</strong> none</p>
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