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<div class="section" id="fix-nve-noforce-command">
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<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>
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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>fix ID group-ID nve
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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="fix.html"><em>fix</em></a> command</li>
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<li>nve/noforce = style name of this fix command</li>
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</ul>
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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>fix 3 wall nve/noforce
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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>Perform updates of position, but not velocity for atoms in the group
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each timestep. In other words, the force on the atoms is ignored and
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their velocity is not updated. The atom velocities are used to update
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their positions.</p>
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<p>This can be useful for wall atoms, when you set their velocities, and
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want the wall to move (or stay stationary) in a prescribed fashion.</p>
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<p>This can also be accomplished via the <a class="reference internal" href="fix_setforce.html"><em>fix setforce</em></a>
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command, but with fix nve/noforce, the forces on the wall atoms are
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unchanged, and can thus be printed by the <a class="reference internal" href="dump.html"><em>dump</em></a> command or
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queried with an equal-style <a class="reference internal" href="variable.html"><em>variable</em></a> that uses the
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fcm() group function to compute the total force on the group of atoms.</p>
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</div>
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<div class="section" id="restart-fix-modify-output-run-start-stop-minimize-info">
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<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>
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<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
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are relevant to this fix. No global or per-atom quantities are stored
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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
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be used with the <em>start/stop</em> keywords of the <a class="reference internal" href="run.html"><em>run</em></a> command.
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This fix is not invoked during <a class="reference internal" href="minimize.html"><em>energy minimization</em></a>.</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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<blockquote>
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<div>none</div></blockquote>
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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_nve.html"><em>fix nve</em></a></p>
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<p><strong>Default:</strong> none</p>
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