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<div class="section" id="pair-style-smd-tri-surface-command">
<span id="index-0"></span><h1>pair_style smd/tri_surface command</h1>
<div class="section" id="syntax">
<h2>Syntax</h2>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">pair_style</span> <span class="n">smd</span><span class="o">/</span><span class="n">tri_surface</span> <span class="n">scale_factor</span>
</pre></div>
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<h2>Examples</h2>
<p>pair_style smd/tri_surface 1.0
pair_coeff 1 1 &lt;contact_stiffness&gt;</p>
</div>
<div class="section" id="description">
<h2>Description</h2>
<p>The <em>smd/tri_surface</em> style calculates contact forces between SPH particles and a rigid wall boundary defined via the
<a class="reference internal" href="fix_smd_wall_surface.html"><span class="doc">smd/wall_surface</span></a> fix.</p>
<p>The contact forces are calculated using a Hertz potential, which evaluates the overlap between a particle
(whose spatial extents are defined via its contact radius) and the triangle.
The effect is that a particle cannot penetrate into the triangular surface.
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 particle</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 the triangulated surface. Usually, <em>scale_factor</em>=1.0.</p>
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<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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<div class="section" id="restrictions">
<h2>Restrictions</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 class="std std-ref">Making LAMMPS</span></a>
section for more info.</p>
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<div class="section" id="related-commands">
<h2>Related commands</h2>
<p><a class="reference internal" href="pair_coeff.html"><span class="doc">pair_coeff</span></a></p>
<p><strong>Default:</strong> none</p>
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