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<div class="section" id="compute-smd-hourglass-error-command">
<span id="index-0"></span><h1>compute smd/hourglass/error 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">smd</span><span class="o">/</span><span class="n">hourglass</span><span class="o">/</span><span class="n">error</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>smd/hourglass/error = 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">smd</span><span class="o">/</span><span class="n">hourglass</span><span class="o">/</span><span class="n">error</span>
</pre></div>
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</div>
<div class="section" id="description">
<h2>Description</h2>
<p>Define a computation which outputs the error of the approximated
relative separation with respect to the actual relative separation of
the particles i and j. Ideally, if the deformation gradient is exact,
and there exists a unique mapping between all particles&#8217; positions
within the neighborhood of the central node and the deformation
gradient, the approximated relative separation will coincide with the
actual relative separation of the particles i and j in the deformed
configuration. This compute is only really useful for debugging the
hourglass control mechanim which is part of the Total-Lagrangian SPH
pair style.</p>
<p>See <a class="reference external" href="USER/smd/SMD_LAMMPS_userguide.pdf">this PDF guide</a> to use Smooth
Mach Dynamics in LAMMPS.</p>
<p><strong>Output Info:</strong></p>
<p>This compute calculates a per-particle vector, which can be accessed by
any command that uses per-particle values from a compute as input. See
<a class="reference internal" href="Section_howto.html#howto-15"><span class="std std-ref">How-to discussions, section 6.15</span></a>
for an overview of LAMMPS output options.</p>
<p>The per-particle vector values will are dimensionless. See
<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 is part of the USER-SMD 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 class="std std-ref">Making LAMMPS</span></a> section for more info.</p>
<p>This quantity will be computed only for particles which interact with
tlsph pair style.</p>
<p><strong>Related Commands:</strong></p>
<p><a class="reference internal" href="compute_smd_tlsph_defgrad.html"><span class="doc">smd/tlsph_defgrad</span></a></p>
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<h2>Default</h2>
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