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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-ulsph-command">
<span id="index-0"></span><h1>pair_style smd/ulsph command</h1>
<div class="section" id="syntax">
<h2>Syntax</h2>
<pre class="literal-block">
pair_style smd/ulsph args
</pre>
<ul class="simple">
<li>these keywords must be given</li>
</ul>
<p>keyword = <em>*DENSITY_SUMMATION</em> or <em>*DENSITY_CONTINUITY</em> and <em>*VELOCITY_GRADIENT</em> or <em>*NO_VELOCITY_GRADIENT</em> and <em>*GRADIENT_CORRECTION</em> or <em>*NO_GRADIENT_CORRECTION</em></p>
</div>
<div class="section" id="examples">
<h2>Examples</h2>
<p>pair_style smd/ulsph *DENSITY_CONTINUITY *VELOCITY_GRADIENT *NO_GRADIENT_CORRECTION</p>
</div>
<div class="section" id="description">
<h2>Description</h2>
<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>
<p>This pair style is invoked similar to the following command:</p>
<pre class="literal-block">
pair_style smd/ulsph *DENSITY_CONTINUITY *VELOCITY_GRADIENT *NO_GRADIENT_CORRECTION
pair_coeff i j *COMMON rho0 c0 Q1 Cp hg &amp;
*END
</pre>
<p>Here, <em>i</em> and <em>j</em> denote the <em>LAMMPS</em> particle types for which this pair style is
defined. Note that <em>i</em> and <em>j</em> can be different, i.e., <em>ulsph</em> cross interactions
between different particle types are allowed. However, <em>i</em>&#8211;<em>i</em> respectively <em>j</em>&#8211;<em>j</em> pair_coeff lines have to preceed a cross interaction.
In contrast to the usual <em>LAMMPS</em> <em>pair coeff</em> definitions, which are given solely a
number of floats and integers, the <em>ulsph</em> <em>pair coeff</em> definition is organised using
keywords. These keywords mark the beginning of different sets of parameters for particle properties,
material constitutive models, and damage models. The <em>pair coeff</em> line must be terminated with
the <em>*END</em> keyword. The use the line continuation operator <em>&amp;</em> is recommended. A typical
invocation of the <em>ulsph</em> for a solid body would consist of an equation of state for computing
the pressure (the diagonal components of the stress tensor), and a material model to compute shear
stresses (the off-diagonal components of the stress tensor).</p>
<p>Note that the use of *GRADIENT_CORRECTION can lead to severe numerical instabilities. For a general fluid simulation, *NO_GRADIENT_CORRECTION is recommended.</p>
<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>
<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>
</div>
<hr class="docutils" />
<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>
</div>
<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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