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<div class="section" id="fix-nve-asphere-noforce-command">
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<span id="index-0"></span><h1>fix nve/asphere/noforce command<a class="headerlink" href="#fix-nve-asphere-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/asphere/noforce
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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/asphere/noforce = style name of this fix command</li>
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</ul>
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</div>
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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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<p>fix 1 all nve/asphere/noforce</p>
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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 and orientation, but not velocity or
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angular momentum for atoms in the group each timestep. In other
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words, the force and torque on the atoms is ignored and their velocity
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and angular momentum are not updated. The atom velocities and
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angularm momenta are used to update their positions and orientation.</p>
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<p>This is useful as an implicit time integrator for Fast Lubrication
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Dynamics, since the velocity and angular momentum are updated by the
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<a class="reference external" href="pair_lubricateU.txt">pair_style lubricuteU</a> command.</p>
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</div>
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<hr class="docutils" />
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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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<p>This fix is part of the ASPHERE package. It is only enabled if LAMMPS
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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>
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<p>This fix requires that atoms store torque and angular momementum and a
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quaternion as defined by the <a class="reference internal" href="atom_style.html"><em>atom_style ellipsoid</em></a>
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command.</p>
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<p>All particles in the group must be finite-size. They cannot be point
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particles, but they can be aspherical or spherical as defined by their
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shape attribute.</p>
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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_noforce.html"><em>fix nve/noforce</em></a>, <a class="reference internal" href="fix_nve_asphere.html"><em>fix nve/asphere</em></a></p>
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<p><strong>Default:</strong> none</p>
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