<spanid="index-0"></span><h1>fix lb/pc command<aclass="headerlink"href="#fix-lb-pc-command"title="Permalink to this headline">¶</a></h1>
<divclass="section"id="syntax">
<h2>Syntax<aclass="headerlink"href="#syntax"title="Permalink to this headline">¶</a></h2>
<divclass="highlight-python"><divclass="highlight"><pre>fix ID group-ID lb/pc
</pre></div>
</div>
<ulclass="simple">
<li>ID, group-ID are documented in the <aclass="reference internal"href="fix.html"><em>fix</em></a> command</li>
<li>lb/pc = style name of this fix command</li>
</ul>
</div>
<divclass="section"id="examples">
<h2>Examples<aclass="headerlink"href="#examples"title="Permalink to this headline">¶</a></h2>
<divclass="highlight-python"><divclass="highlight"><pre>fix 1 all lb/pc
</pre></div>
</div>
</div>
<divclass="section"id="description">
<h2>Description<aclass="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 <aclass="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 <aclass="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>
<h2>Restart, fix_modify, output, run start/stop, minimize info<aclass="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 <aclass="reference internal"href="restart.html"><em>binary restart files</em></a>. None of the <aclass="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 <spanclass="xref std std-ref">output commands</span>. No parameter of this fix can be
used with the <em>start/stop</em> keywords of the <aclass="reference internal"href="run.html"><em>run</em></a> command.
This fix is not invoked during <aclass="reference internal"href="minimize.html"><em>energy minimization</em></a>.</p>
</div>
<divclass="section"id="restrictions">
<h2>Restrictions<aclass="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 <aclass="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
<aclass="reference internal"href="fix_lb_fluid.html"><em>fix lb/fluid</em></a> command, and must come after this
command.</p>
</div>
<divclass="section"id="related-commands">
<h2>Related commands<aclass="headerlink"href="#related-commands"title="Permalink to this headline">¶</a></h2>
<pid="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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