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<title>compute smd/contact/radius command — LAMMPS documentation</title>
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<li>compute smd/contact/radius command</li>
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<div class="section" id="compute-smd-contact-radius-command">
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<span id="index-0"></span><h1>compute smd/contact/radius command</h1>
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<div class="section" id="syntax">
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<h2>Syntax</h2>
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<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>
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</pre></div>
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<ul class="simple">
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<li>ID, group-ID are documented in <a class="reference internal" href="compute.html"><span class="doc">compute</span></a> command</li>
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<li>smd/contact/radius = style name of this compute command</li>
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</ul>
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<div class="section" id="examples">
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<h2>Examples</h2>
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<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>
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</pre></div>
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</div>
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<div class="section" id="description">
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<h2>Description</h2>
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<p>Define a computation which outputs the contact radius, i.e., the
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radius used to prevent particles from penetrating each other. The
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contact radius is used only to prevent particles belonging to
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different physical bodies from penetrating each other. It is used by
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the contact pair styles, e.g., smd/hertz and smd/tri_surface.</p>
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<p>See <a class="reference external" href="USER/smd/SMD_LAMMPS_userguide.pdf">this PDF guide</a> to using Smooth
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Mach Dynamics in LAMMPS.</p>
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<p>The value of the contact radius will be 0.0 for particles not in the
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specified compute group.</p>
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<p><strong>Output info:</strong></p>
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<p>This compute calculates a per-particle vector, which can be accessed by
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any command that uses per-particle values from a compute as input. See
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<a class="reference internal" href="Section_howto.html#howto-15"><span class="std std-ref">Section_howto 15</span></a> for an overview of
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LAMMPS output options.</p>
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<p>The per-particle vector values will be in distance <a class="reference internal" href="units.html"><span class="doc">units</span></a>.</p>
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</div>
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<div class="section" id="restrictions">
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<h2>Restrictions</h2>
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<p>This compute is part of the USER-SMD package. It is only enabled if
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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>
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</div>
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<div class="section" id="related-commands">
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<h2>Related commands</h2>
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<p><a class="reference internal" href="dump.html"><span class="doc">dump custom</span></a> smd/hertz smd/tri_surface</p>
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<p><strong>Default:</strong> none</p>
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