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<div class="section" id="compute-smd-tlsph-defgrad-command">
<span id="index-0"></span><h1>compute smd/tlsph/defgrad 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">tlsph</span><span class="o">/</span><span class="n">defgrad</span>
</pre></div>
</div>
<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/tlsph/defgrad = 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">tlsph</span><span class="o">/</span><span class="n">defgrad</span>
</pre></div>
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<div class="section" id="description">
<h2>Description</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 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 be given dimensionless. See
<a class="reference internal" href="units.html"><span class="doc">units</span></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</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. 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</h2>
<p><a class="reference internal" href="compute_smd_hourglass_error.html"><span class="doc">smd/hourglass/error</span></a></p>
<p><strong>Default:</strong> none</p>
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