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<div class="section" id="fix-nve-noforce-command">
<span id="index-0"></span><h1>fix nve/noforce command<a class="headerlink" href="#fix-nve-noforce-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 nve
</pre></div>
</div>
<ul class="simple">
<li>ID, group-ID are documented in <a class="reference internal" href="fix.html"><em>fix</em></a> command</li>
<li>nve/noforce = style name of this fix command</li>
</ul>
</div>
<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 3 wall nve/noforce
</pre></div>
</div>
</div>
<div class="section" id="description">
<h2>Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
<p>Perform updates of position, but not velocity for atoms in the group
each timestep. In other words, the force on the atoms is ignored and
their velocity is not updated. The atom velocities are used to update
their positions.</p>
<p>This can be useful for wall atoms, when you set their velocities, and
want the wall to move (or stay stationary) in a prescribed fashion.</p>
<p>This can also be accomplished via the <a class="reference internal" href="fix_setforce.html"><em>fix setforce</em></a>
command, but with fix nve/noforce, the forces on the wall atoms are
unchanged, and can thus be printed by the <a class="reference internal" href="dump.html"><em>dump</em></a> command or
queried with an equal-style <a class="reference internal" href="variable.html"><em>variable</em></a> that uses the
fcm() group function to compute the total force on the group of atoms.</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 <a class="reference internal" href="Section_howto.html#howto-15"><span>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"><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>
<blockquote>
<div>none</div></blockquote>
</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_nve.html"><em>fix nve</em></a></p>
<p><strong>Default:</strong> none</p>
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