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<div class="section" id="compute-smd-hourglass-error-command">
<span id="index-0"></span><h1>compute smd/hourglass_error command<a class="headerlink" href="#compute-smd-hourglass-error-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 smd/hourglass_error
</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>smd/hourglass_error = style name of this compute command</li>
</ul>
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<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 smd/hourglass_error
</pre></div>
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<div class="section" id="description">
<h2>Description<a class="headerlink" href="#description" title="Permalink to this headline"></a></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>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"><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 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>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"><em>smd/tlsph_defgrad</em></a></p>
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