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<title>pair_style sph/taitwater/morris command — LAMMPS documentation</title>
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<li>pair_style sph/taitwater/morris command</li>
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<div class="section" id="pair-style-sph-taitwater-morris-command">
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<span id="index-0"></span><h1>pair_style sph/taitwater/morris 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">sph</span><span class="o">/</span><span class="n">taitwater</span><span class="o">/</span><span class="n">morris</span>
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</pre></div>
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</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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<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">pair_style</span> <span class="n">sph</span><span class="o">/</span><span class="n">taitwater</span><span class="o">/</span><span class="n">morris</span>
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<span class="n">pair_coeff</span> <span class="o">*</span> <span class="o">*</span> <span class="mf">1000.0</span> <span class="mf">1430.0</span> <span class="mf">1.0</span> <span class="mf">2.4</span>
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</pre></div>
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</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>The sph/taitwater/morris style computes pressure forces between SPH
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particles according to Tait’s equation of state:</p>
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<img alt="_images/pair_sph_tait.jpg" class="align-center" src="_images/pair_sph_tait.jpg" />
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<p>where gamma = 7 and B = c_0^2 rho_0 / gamma, with rho_0 being the
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reference density and c_0 the reference speed of sound.</p>
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<p>This pair style also computes laminar viscosity <a class="reference internal" href="#morris"><span class="std std-ref">(Morris)</span></a>.</p>
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<p>See <a class="reference external" href="USER/sph/SPH_LAMMPS_userguide.pdf">this PDF guide</a> to using SPH in
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LAMMPS.</p>
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<p>The following coefficients must be defined for each pair of atoms
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types via the <a class="reference internal" href="pair_coeff.html"><span class="doc">pair_coeff</span></a> command as in the examples
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above.</p>
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<ul class="simple">
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<li>rho0 reference density (mass/volume units)</li>
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<li>c0 reference soundspeed (distance/time units)</li>
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<li>nu dynamic viscosity (mass*distance/time units)</li>
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<li>h kernel function cutoff (distance units)</li>
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</ul>
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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>This style does not support mixing. Thus, coefficients for all
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I,J pairs must be specified explicitly.</p>
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<p>This style does not support the <a class="reference internal" href="pair_modify.html"><span class="doc">pair_modify</span></a>
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shift, table, and tail options.</p>
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<p>This style does not write information to <a class="reference internal" href="restart.html"><span class="doc">binary restart files</span></a>. Thus, you need to re-specify the pair_style and
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pair_coeff commands in an input script that reads a restart file.</p>
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<p>This style can only be used via the <em>pair</em> keyword of the <a class="reference internal" href="run_style.html"><span class="doc">run_style respa</span></a> command. It does not support the <em>inner</em>,
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<em>middle</em>, <em>outer</em> keywords.</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 pair style is part of the USER-SPH package. It is only enabled
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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>
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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>, pair_sph/rhosum</p>
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<p><strong>Default:</strong> none</p>
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<hr class="docutils" />
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<p id="morris"><strong>(Morris)</strong> Morris, Fox, Zhu, J Comp Physics, 136, 214-226 (1997).</p>
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