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<title>compute smd/tlsph_defgrad command &mdash; LAMMPS 15 Dec 2015 documentation</title>
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<div class="section" id="compute-smd-tlsph-defgrad-command">
<span id="index-0"></span><h1>compute smd/tlsph_defgrad command<a class="headerlink" href="#compute-smd-tlsph-defgrad-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/tlsph_defgrad
</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/tlsph_defgrad = style name of this compute command</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 smd/tlsph_defgrad
</pre></div>
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</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 deformation gradient.
It is only meaningful for particles which interact according to 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 outputss a per-particle vector of vectors (tensors), 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 be given dimensionless. See <a class="reference internal" href="units.html"><em>units</em></a>.
The per-particle vector has 10 entries. The first nine entries correspond to the xx, xy, xz, yx, yy, yz, zx, zy, zz components
of the asymmetric deformation gradient tensor. The tenth entry is the determinant of the deformation gradient.</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. TThis compute can only be used for particles which interact via the
total Lagrangian SPH pair style.</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_smd_hourglass_error.html"><em>smd/hourglass_error</em></a></p>
<p><strong>Default:</strong> none</p>
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