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<li>compute ke/rigid command</li>
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<div class="section" id="compute-ke-rigid-command">
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<span id="index-0"></span><h1>compute ke/rigid command</h1>
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<div class="section" id="syntax">
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<h2>Syntax</h2>
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<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">ke</span><span class="o">/</span><span class="n">rigid</span> <span class="n">fix</span><span class="o">-</span><span class="n">ID</span>
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</pre></div>
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<ul class="simple">
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<li>ID, group-ID are documented in <a class="reference internal" href="compute.html"><span class="doc">compute</span></a> command</li>
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<li>ke = style name of this compute command</li>
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<li>fix-ID = ID of rigid body fix</li>
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</ul>
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</div>
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<div class="section" id="examples">
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<h2>Examples</h2>
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<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">ke</span><span class="o">/</span><span class="n">rigid</span> <span class="n">myRigid</span>
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</pre></div>
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</div>
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</div>
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<div class="section" id="description">
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<h2>Description</h2>
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<p>Define a computation that calculates the translational kinetic energy
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of a collection of rigid bodies, as defined by one of the <a class="reference internal" href="fix_rigid.html"><span class="doc">fix rigid</span></a> command variants.</p>
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<p>The kinetic energy of each rigid body is computed as 1/2 M Vcm^2,
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where M is the total mass of the rigid body, and Vcm is its
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center-of-mass velocity.</p>
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<p>The <em>fix-ID</em> should be the ID of one of the <a class="reference internal" href="fix_rigid.html"><span class="doc">fix rigid</span></a>
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commands which defines the rigid bodies. The group specified in the
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compute command is ignored. The kinetic energy of all the rigid
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bodies defined by the fix rigid command in included in the
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calculation.</p>
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<p><strong>Output info:</strong></p>
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<p>This compute calculates a global scalar (the summed KE of all the
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rigid bodies). This value can be used by any command that uses a
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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
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options.</p>
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<p>The scalar value calculated by this compute is “extensive”. The
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scalar value will be in energy <a class="reference internal" href="units.html"><span class="doc">units</span></a>.</p>
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</div>
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<div class="section" id="restrictions">
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<h2>Restrictions</h2>
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<p>This compute is part of the RIGID package. It is only enabled if
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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>
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</div>
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<div class="section" id="related-commands">
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<h2>Related commands</h2>
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<p><a class="reference internal" href="compute_erotate_rigid.html"><span class="doc">compute erotate/rigid</span></a></p>
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<p><strong>Default:</strong> none</p>
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