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<div class="section" id="compute-smd-tlsph-dt-command">
<span id="index-0"></span><h1>compute smd/tlsph/dt command</h1>
<div class="section" id="syntax">
<h2>Syntax</h2>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">compute</span> <span class="n">ID</span> <span class="n">group</span><span class="o">-</span><span class="n">ID</span> <span class="n">smd</span><span class="o">/</span><span class="n">tlsph</span><span class="o">/</span><span class="n">dt</span>
</pre></div>
</div>
<ul class="simple">
<li>ID, group-ID are documented in <a class="reference internal" href="compute.html"><span class="doc">compute</span></a> command</li>
<li>smd/tlsph/dt = style name of this compute command</li>
</ul>
</div>
<div class="section" id="examples">
<h2>Examples</h2>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">compute</span> <span class="mi">1</span> <span class="nb">all</span> <span class="n">smd</span><span class="o">/</span><span class="n">tlsph</span><span class="o">/</span><span class="n">dt</span>
</pre></div>
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</div>
<div class="section" id="description">
<h2>Description</h2>
<p>Define a computation that outputs the CFL-stable time increment per
particle. This time increment is essentially given by the speed of
sound, divided by the SPH smoothing length. Because both the speed of
sound and the smoothing length typically change during the course of a
simulation, the stable time increment needs to be recomputed every
time step. This calculation is performed automatically in the
relevant SPH pair styles and this compute only serves to make the
stable time increment accessible for output purposes.</p>
<p>See <a class="reference external" href="USER/smd/SMD_LAMMPS_userguide.pdf">this PDF guide</a> to using Smooth
Mach Dynamics in LAMMPS.</p>
<p><strong>Output info:</strong></p>
<p>This compute calculates a per-particle vector, which can be accessed
by any command that uses per-particle values from a compute as input.
See <a class="reference internal" href="Section_howto.html#howto-15"><span class="std std-ref">How-to discussions, section 6.15</span></a> for
an overview of LAMMPS output options.</p>
<p>The per-particle values will be given in <a class="reference internal" href="units.html"><span class="doc">units</span></a> of time.</p>
</div>
<div class="section" id="restrictions">
<h2>Restrictions</h2>
<p>This compute 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>
<p>This compute can only be used for particles interacting with the
Total-Lagrangian SPH pair style.</p>
</div>
<div class="section" id="related-commands">
<h2>Related commands</h2>
<p><a class="reference internal" href="fix_smd_adjust_dt.html"><span class="doc">smd/adjust/dt</span></a></p>
<p><strong>Default:</strong> none</p>
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