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<title>compute ke/rigid command &mdash; LAMMPS 15 Dec 2015 documentation</title>
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<div class="section" id="compute-ke-rigid-command">
<span id="index-0"></span><h1>compute ke/rigid command<a class="headerlink" href="#compute-ke-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 ke/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>ke = 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 ke/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 translational 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 kinetic energy of each rigid body is computed as 1/2 M Vcm^2,
where M is the total mass of the rigid body, and Vcm is its
center-of-mass velocity.</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 kinetic 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 KE 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><a class="reference internal" href="compute_erotate_rigid.html"><em>compute erotate/rigid</em></a></p>
<p><strong>Default:</strong> none</p>
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