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<div class="section" id="compute-smd-contact-radius-command">
<span id="index-0"></span><h1>compute smd/contact/radius 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">contact</span><span class="o">/</span><span class="n">radius</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/contact/radius = 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">contact</span><span class="o">/</span><span class="n">radius</span>
</pre></div>
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</div>
<div class="section" id="description">
<h2>Description</h2>
<p>Define a computation which outputs the contact radius, i.e., the
radius used to prevent particles from penetrating each other. The
contact radius is used only to prevent particles belonging to
different physical bodies from penetrating each other. It is used by
the contact pair styles, e.g., smd/hertz and smd/tri_surface.</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>The value of the contact radius will be 0.0 for particles not in the
specified compute group.</p>
<p><strong>Output info:</strong></p>
<p>This compute calculates a per-particle vector, 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">Section_howto 15</span></a> for an overview of
LAMMPS output options.</p>
<p>The per-particle vector values will be in distance <a class="reference internal" href="units.html"><span class="doc">units</span></a>.</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.</p>
</div>
<div class="section" id="related-commands">
<h2>Related commands</h2>
<p><a class="reference internal" href="dump.html"><span class="doc">dump custom</span></a> smd/hertz smd/tri_surface</p>
<p><strong>Default:</strong> none</p>
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