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<li class="toctree-l1"><a class="reference internal" href="Section_intro.html">1. Introduction</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Section_accelerate.html">5. Accelerating LAMMPS performance</a></li>
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<li>compute smd/hourglass/error command</li>
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<div class="section" id="compute-smd-hourglass-error-command">
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<span id="index-0"></span><h1>compute smd/hourglass/error 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">smd</span><span class="o">/</span><span class="n">hourglass</span><span class="o">/</span><span class="n">error</span>
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</pre></div>
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</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>smd/hourglass/error = style name of this compute command</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">smd</span><span class="o">/</span><span class="n">hourglass</span><span class="o">/</span><span class="n">error</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 which outputs the error of the approximated
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relative separation with respect to the actual relative separation of
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the particles i and j. Ideally, if the deformation gradient is exact,
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and there exists a unique mapping between all particles’ positions
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within the neighborhood of the central node and the deformation
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gradient, the approximated relative separation will coincide with the
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actual relative separation of the particles i and j in the deformed
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configuration. This compute is only really useful for debugging the
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hourglass control mechanim which is part of the Total-Lagrangian SPH
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pair style.</p>
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<p>See <a class="reference external" href="USER/smd/SMD_LAMMPS_userguide.pdf">this PDF guide</a> to use Smooth
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Mach Dynamics in LAMMPS.</p>
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<p><strong>Output Info:</strong></p>
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<p>This compute calculates a per-particle vector, which can be accessed by
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any command that uses per-particle values from a compute as input. See
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<a class="reference internal" href="Section_howto.html#howto-15"><span class="std std-ref">How-to discussions, section 6.15</span></a>
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for an overview of LAMMPS output options.</p>
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<p>The per-particle vector values will are dimensionless. See
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<span class="xref doc">units</span>.</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 USER-SMD 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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<p>This quantity will be computed only for particles which interact with
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tlsph pair style.</p>
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<p><strong>Related Commands:</strong></p>
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<p><a class="reference internal" href="compute_smd_tlsph_defgrad.html"><span class="doc">smd/tlsph_defgrad</span></a></p>
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</div>
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<h2>Default</h2>
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