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<title>pair_style smd/hertz command — LAMMPS documentation</title>
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<li>pair_style smd/hertz command</li>
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<div class="section" id="pair-style-smd-hertz-command">
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<span id="index-0"></span><h1>pair_style smd/hertz 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">pair_style</span> <span class="n">smd</span><span class="o">/</span><span class="n">hertz</span> <span class="n">scale_factor</span>
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</pre></div>
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</div>
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<div class="section" id="examples">
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<h2>Examples</h2>
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<p>pair_style smd/hertz 1.0
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pair_coeff 1 1 <contact_stiffness></p>
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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>The <em>smd/hertz</em> style calculates contact forces between SPH particles belonging to different physical bodies.</p>
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<p>The contact forces are calculated using a Hertz potential, which evaluates the overlap between two particles
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(whose spatial extents are defined via its contact radius).
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The effect is that a particles cannot penetrate into each other.
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The parameter <contact_stiffness> has units of pressure and should equal roughly one half
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of the Young’s modulus (or bulk modulus in the case of fluids) of the material model associated with the SPH particles.</p>
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<p>The parameter <em>scale_factor</em> can be used to scale the particles’ contact radii. This can be useful to control how close
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particles can approach each other. Usually, <em>scale_factor</em>=1.0.</p>
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<hr class="docutils" />
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<p><strong>Mixing, shift, table, tail correction, restart, rRESPA info</strong>:</p>
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<p>No mixing is performed automatically.
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Currently, no part of USER-SMD supports restarting nor minimization.
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rRESPA does not apply to this pair style.</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 fix 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>
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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="pair_coeff.html"><span class="doc">pair_coeff</span></a></p>
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<p><strong>Default:</strong> none</p>
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