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<div class="section" id="fix-manifoldforce-command">
<span id="index-0"></span><h1>fix manifoldforce command</h1>
<div class="section" id="syntax">
<h2>Syntax</h2>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">fix</span> <span class="n">ID</span> <span class="n">group</span><span class="o">-</span><span class="n">ID</span> <span class="n">manifoldforce</span> <span class="n">manifold</span> <span class="n">manifold</span><span class="o">-</span><span class="n">args</span> <span class="o">...</span>
</pre></div>
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<ul class="simple">
<li>ID, group-ID are documented in <a class="reference internal" href="fix.html"><span class="doc">fix</span></a> command</li>
<li>manifold = name of the manifold</li>
<li>manifold-args = parameters for the manifold</li>
</ul>
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<div class="section" id="examples">
<h2>Examples</h2>
<p>fix constrain all manifoldforce sphere 5.0</p>
</div>
<div class="section" id="description">
<h2>Description</h2>
<p>This fix subtracts each time step from the force the component along the normal of the specified <a class="reference internal" href="manifolds.html"><span class="doc">manifold</span></a>.
This can be used in combination with <a class="reference internal" href="minimize.html"><span class="doc">minimize</span></a> to remove overlap between particles while
keeping them (roughly) constrained to the given manifold, e.g. to set up a run with <a class="reference internal" href="fix_nve_manifold_rattle.html"><span class="doc">fix nve/manifold/rattle</span></a>.
I have found that only <em>hftn</em> and <em>quickmin</em> with a very small time step perform adequately though.</p>
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<p><strong>Restart, fix_modify, output, run start/stop, minimize info:</strong></p>
<p>No information about this fix is written to <a class="reference internal" href="restart.html"><span class="doc">binary restart files</span></a>. None of the <a class="reference internal" href="fix_modify.html"><span class="doc">fix_modify</span></a> options
are relevant to this fix. No global or per-atom quantities are stored
by this fix for access by various <a class="reference internal" href="Section_howto.html#howto-15"><span class="std std-ref">output commands</span></a>. No parameter of this fix can
be used with the <em>start/stop</em> keywords of the <a class="reference internal" href="run.html"><span class="doc">run</span></a> command.
This fix is invoked during <a class="reference internal" href="minimize.html"><span class="doc">energy minimization</span></a>.</p>
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<h2>Restrictions</h2>
<p>This fix is part of the USER-MANIFOLD 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>Only use this with <em>min_style hftn</em> or <em>min_style quickmin</em>. If not, the constraints
will not be satisfied very well at all. A warning is generated if the <em>min_style</em> is
incompatible but no error.</p>
</div>
<hr class="docutils" />
<div class="section" id="related-commands">
<h2>Related commands</h2>
<p><a class="reference internal" href="fix_nve_manifold_rattle.html"><span class="doc">fix nve/manifold/rattle</span></a>, <a class="reference internal" href="fix_nvt_manifold_rattle.html"><span class="doc">fix nvt/manifold/rattle</span></a></p>
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