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<title>compute smd/tlsph_dt command — LAMMPS 15 May 2015 version documentation</title>
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<li>compute smd/tlsph_dt command</li>
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<div class="section" id="compute-smd-tlsph-dt-command">
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<span id="index-0"></span><h1>compute smd/tlsph_dt command<a class="headerlink" href="#compute-smd-tlsph-dt-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>compute ID group-ID smd/tlsph_dt
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</pre></div>
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</div>
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<ul class="simple">
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<li>ID, group-ID are documented in <a class="reference internal" href="compute.html"><em>compute</em></a> command</li>
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<li>smd/tlsph_dt = style name of this compute command</li>
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</ul>
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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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<div class="highlight-python"><div class="highlight"><pre>compute 1 all smd/tlsph_dt
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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<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
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<p>Define a computation that outputs the CFL-stable time increment per particle.
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This time increment is essentially given by the speed of sound, divided by the SPH smoothing length.
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Because both the speed of sound and the smoothing length typically change during the course of a simulation,
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the stable time increment needs to be recomputed every time step.
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This calculation is performed automatically in the relevant SPH pair styles and this compute only serves to make the
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stable time increment accessible for output purposes.</p>
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<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>
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<p><strong>Output info:</strong></p>
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<p>This compute calculates a per-particle vector, which can be accessed by
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any command that uses per-particle values from a compute as input. See
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<a class="reference internal" href="Section_howto.html#howto-15"><span>How-to discussions, section 6.15</span></a>
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for an overview of LAMMPS output options.</p>
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<p>The per-particle values will be given in <a class="reference internal" href="units.html"><em>units</em></a> of time.</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 compute 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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<p>This compute can only be used for particles interacting with the Total-Lagrangian SPH pair style.</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="fix_smd_adjust_dt.html"><em>smd/adjust_dt</em></a></p>
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<p><strong>Default:</strong> none</p>
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