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<title>pair_style smd/hertz command &mdash; LAMMPS 15 May 2015 version documentation</title>
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<li class="toctree-l1"><a class="reference internal" href="Section_intro.html">1. Introduction</a></li>
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<div class="section" id="pair-style-smd-hertz-command">
<span id="index-0"></span><h1>pair_style smd/hertz command<a class="headerlink" href="#pair-style-smd-hertz-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>pair_style smd/hertz scale_factor
</pre></div>
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<div class="section" id="examples">
<h2>Examples<a class="headerlink" href="#examples" title="Permalink to this headline"></a></h2>
<p>pair_style smd/hertz 1.0
pair_coeff 1 1 &lt;contact_stiffness&gt;</p>
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<div class="section" id="description">
<h2>Description<a class="headerlink" href="#description" title="Permalink to this headline"></a></h2>
<p>The <em>smd/hertz</em> style calculates contact forces between SPH particles belonging to different physical bodies.</p>
<p>The contact forces are calculated using a Hertz potential, which evaluates the overlap between two particles
(whose spatial extents are defined via its contact radius).
The effect is that a particles cannot penetrate into each other.
The parameter &lt;contact_stiffness&gt; has units of pressure and should equal roughly one half
of the Young&#8217;s modulus (or bulk modulus in the case of fluids) of the material model associated with the SPH particles.</p>
<p>The parameter <em>scale_factor</em> can be used to scale the particles&#8217; contact radii. This can be useful to control how close
particles can approach each other. Usually, <a href="#id1"><span class="problematic" id="id2">*</span></a>scale_factor*=1.0.</p>
<hr class="docutils" />
<p><strong>Mixing, shift, table, tail correction, restart, rRESPA info</strong>:</p>
<p>No mixing is performed automatically.
Currently, no part of USER-SMD supports restarting nor minimization.
rRESPA does not apply to this pair style.</p>
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<h2>Restrictions<a class="headerlink" href="#restrictions" title="Permalink to this headline"></a></h2>
<p>This fix 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>Making LAMMPS</span></a>
section for more info.</p>
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<div class="section" id="related-commands">
<h2>Related commands<a class="headerlink" href="#related-commands" title="Permalink to this headline"></a></h2>
<p><a class="reference internal" href="pair_coeff.html"><em>pair_coeff</em></a></p>
<p><strong>Default:</strong> none</p>
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