<spanid="index-0"></span><h1>compute smd/ulsph_strain_rate command<aclass="headerlink"href="#compute-smd-ulsph-strain-rate-command"title="Permalink to this headline">¶</a></h1>
<divclass="section"id="syntax">
<h2>Syntax<aclass="headerlink"href="#syntax"title="Permalink to this headline">¶</a></h2>
<divclass="highlight-python"><divclass="highlight"><pre>compute ID group-ID smd/ulsph_strain_rate
</pre></div>
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<ulclass="simple">
<li>ID, group-ID are documented in <aclass="reference internal"href="compute.html"><em>compute</em></a> command</li>
<li>smd/ulsph_strain_rate = style name of this compute command</li>
</ul>
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<divclass="section"id="examples">
<h2>Examples<aclass="headerlink"href="#examples"title="Permalink to this headline">¶</a></h2>
<divclass="highlight-python"><divclass="highlight"><pre>compute 1 all smd/ulsph_strain_rate
</pre></div>
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<divclass="section"id="description">
<h2>Description<aclass="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 <aclass="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 <aclass="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 <aclass="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>
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<divclass="section"id="restrictions">
<h2>Restrictions<aclass="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 <aclass="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>
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<divclass="section"id="related-commands">
<h2>Related commands<aclass="headerlink"href="#related-commands"title="Permalink to this headline">¶</a></h2>
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