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<div class="section" id="fix-lb-pc-command">
<span id="index-0"></span><h1>fix lb/pc command<a class="headerlink" href="#fix-lb-pc-command" title="Permalink to this headline"></a></h1>
<div class="section" id="syntax">
<h2>Syntax<a class="headerlink" href="#syntax" title="Permalink to this headline"></a></h2>
<div class="highlight-python"><div class="highlight"><pre>fix ID group-ID lb/pc
</pre></div>
</div>
<ul class="simple">
<li>ID, group-ID are documented in the <a class="reference internal" href="fix.html"><em>fix</em></a> command</li>
<li>lb/pc = style name of this fix command</li>
</ul>
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<div class="section" id="examples">
<h2>Examples<a class="headerlink" href="#examples" title="Permalink to this headline"></a></h2>
<div class="highlight-python"><div class="highlight"><pre>fix 1 all lb/pc
</pre></div>
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<div class="section" id="description">
<h2>Description<a class="headerlink" href="#description" title="Permalink to this headline"></a></h2>
<p>Update the positions and velocities of the individual particles
described by <em>group-ID</em>, experiencing velocity-dependent hydrodynamic
forces, using the integration algorithm described in <a class="reference internal" href="fix_lb_viscous.html#mackay"><span>Mackay et al.</span></a>. This integration algorithm should only be used if a
user-specified value for the force-coupling constant used in <a class="reference internal" href="fix_lb_fluid.html"><em>fix lb/fluid</em></a> has been set; do not use this integration
algorithm if the force coupling constant has been set by default.</p>
</div>
<div class="section" id="restart-fix-modify-output-run-start-stop-minimize-info">
<h2>Restart, fix_modify, output, run start/stop, minimize info<a class="headerlink" href="#restart-fix-modify-output-run-start-stop-minimize-info" title="Permalink to this headline"></a></h2>
<p>No information about this fix is written to <a class="reference internal" href="restart.html"><em>binary restart files</em></a>. None of the <a class="reference internal" href="fix_modify.html"><em>fix_modify</em></a> options
are relevant to this fix. No global or per-atom quantities are stored
by this fix for access by various <span class="xref std std-ref">output commands</span>. No parameter of this fix can be
used with the <em>start/stop</em> keywords of the <a class="reference internal" href="run.html"><em>run</em></a> command.
This fix is not invoked during <a class="reference internal" href="minimize.html"><em>energy minimization</em></a>.</p>
</div>
<div class="section" id="restrictions">
<h2>Restrictions<a class="headerlink" href="#restrictions" title="Permalink to this headline"></a></h2>
<p>This fix is part of the USER-LB 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>Making LAMMPS</span></a> section for more info.</p>
<p>Can only be used if a lattice-Boltzmann fluid has been created via the
<a class="reference internal" href="fix_lb_fluid.html"><em>fix lb/fluid</em></a> command, and must come after this
command.</p>
</div>
<div class="section" id="related-commands">
<h2>Related commands<a class="headerlink" href="#related-commands" title="Permalink to this headline"></a></h2>
<p><a class="reference internal" href="fix_lb_fluid.html"><em>fix lb/fluid</em></a> <a class="reference internal" href="fix_lb_rigid_pc_sphere.html"><em>fix lb/rigid/pc/sphere</em></a></p>
<p><strong>Default:</strong> None.</p>
<hr class="docutils" />
<p id="mackay"><strong>(Mackay et al.)</strong> Mackay, F. E., Ollila, S.T.T., and Denniston, C., Hydrodynamic Forces Implemented into LAMMPS through a lattice-Boltzmann fluid, Computer Physics Communications 184 (2013) 2021-2031.</p>
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