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<title>pair_style smd/ulsph command — 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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<li>pair_style smd/ulsph command</li>
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<div class="section" id="pair-style-smd-ulsph-command">
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<span id="index-0"></span><h1>pair_style smd/ulsph command<a class="headerlink" href="#pair-style-smd-ulsph-command" title="Permalink to this headline">¶</a></h1>
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<div class="section" id="syntax">
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<h2>Syntax<a class="headerlink" href="#syntax" title="Permalink to this headline">¶</a></h2>
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<div class="highlight-python"><div class="highlight"><pre>pair_style smd/ulsph args
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</pre></div>
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</div>
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<ul class="simple">
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<li>these keywords must be given</li>
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</ul>
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<p>keyword = <a href="#id1"><span class="problematic" id="id2">**</span></a>DENSITY_SUMMATION* or <a href="#id3"><span class="problematic" id="id4">**</span></a>DENSITY_CONTINUITY* and <a href="#id5"><span class="problematic" id="id6">**</span></a>VELOCITY_GRADIENT* or <a href="#id7"><span class="problematic" id="id8">**</span></a>NO_VELOCITY_GRADIENT* and <a href="#id9"><span class="problematic" id="id10">**</span></a>GRADIENT_CORRECTION* or <a href="#id11"><span class="problematic" id="id12">**</span></a>NO_GRADIENT_CORRECTION*</p>
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</div>
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<div class="section" id="examples">
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<h2>Examples<a class="headerlink" href="#examples" title="Permalink to this headline">¶</a></h2>
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<p>pair_style smd/ulsph <a href="#id13"><span class="problematic" id="id14">*</span></a>DENSITY_CONTINUITY <a href="#id15"><span class="problematic" id="id16">*</span></a>VELOCITY_GRADIENT <a href="#id17"><span class="problematic" id="id18">*</span></a>NO_GRADIENT_CORRECTION</p>
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</div>
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<div class="section" id="description">
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<h2>Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
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<p>The <em>smd/ulsph</em> style computes particle interactions according to continuum mechanics constitutive laws and an updated Lagrangian Smooth-Particle Hydrodynamics algorithm.</p>
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<p>This pair style is invoked similar to the following command:</p>
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<div class="highlight-python"><div class="highlight"><pre>pair_style smd/ulsph *DENSITY_CONTINUITY *VELOCITY_GRADIENT *NO_GRADIENT_CORRECTION
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pair_coeff i j *COMMON rho0 c0 Q1 Cp hg &
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*END
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</pre></div>
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</div>
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<p>Here, <em>i</em> and <em>j</em> denote the <em>LAMMPS</em> particle types for which this pair style is
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defined. Note that <em>i</em> and <em>j</em> can be different, i.e., <em>ulsph</em> cross interactions
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between different particle types are allowed. However, <em>i</em>–<em>i</em> respectively <em>j</em>–<em>j</em> pair_coeff lines have to preceed a cross interaction.
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In contrast to the usual <em>LAMMPS</em> <em>pair coeff</em> definitions, which are given solely a
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number of floats and integers, the <em>ulsph</em> <em>pair coeff</em> definition is organised using
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keywords. These keywords mark the beginning of different sets of parameters for particle properties,
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material constitutive models, and damage models. The <em>pair coeff</em> line must be terminated with
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the <a href="#id29"><span class="problematic" id="id30">**</span></a>END* keyword. The use the line continuation operator <em>&</em> is recommended. A typical
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invocation of the <em>ulsph</em> for a solid body would consist of an equation of state for computing
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the pressure (the diagonal components of the stress tensor), and a material model to compute shear
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stresses (the off-diagonal components of the stress tensor).</p>
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<p>Note that the use of <a href="#id31"><span class="problematic" id="id32">*</span></a>GRADIENT_CORRECTION can lead to severe numerical instabilities. For a general fluid simulation, <a href="#id33"><span class="problematic" id="id34">*</span></a>NO_GRADIENT_CORRECTION is recommended.</p>
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<p>Please see the <a class="reference external" href="USER/smd/SMD_LAMMPS_userguide.pdf">SMD user guide</a> for a complete listing of the possible keywords and material models.</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<a class="headerlink" href="#restrictions" title="Permalink to this headline">¶</a></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>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<a class="headerlink" href="#related-commands" title="Permalink to this headline">¶</a></h2>
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<p><a class="reference internal" href="pair_coeff.html"><em>pair_coeff</em></a></p>
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<p><strong>Default:</strong> none</p>
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