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<title>compute smd/ulsph_strain_rate command &mdash; LAMMPS 15 Dec 2015 documentation</title>
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<div class="section" id="compute-smd-ulsph-strain-rate-command">
<span id="index-0"></span><h1>compute smd/ulsph_strain_rate command<a class="headerlink" href="#compute-smd-ulsph-strain-rate-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/ulsph_strain_rate
</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/ulsph_strain_rate = 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/ulsph_strain_rate
</pre></div>
</div>
</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 outputs the rate of the logarithmic strain tensor
for particles interacting via the updated Lagrangian SPH pair style.</p>
<p>See <a class="reference external" href="USER/smd/SMD_LAMMPS_userguide.pdf">this PDF guide</a> to using Smooth Mach Dynamics in LAMMPS.</p>
<p><strong>Output info:</strong></p>
<p>This compute calculates 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>Section_howto 15</span></a> for an overview of
LAMMPS output options.</p>
<p>The values will be given in <a class="reference internal" href="units.html"><em>units</em></a> of one over time.</p>
<p>The per-particle vector has 6 entries, corresponding to the xx, yy, zz, xy, xz, yz components
of the symmetric strain rate tensor.</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-2"><span>Making LAMMPS</span></a>
section for more info. This compute can only be used for particles which interact with the updated 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>smd/utsph_strain_rate</p>
<p><strong>Default:</strong> none</p>
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