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<span id="index-0"></span><h1>fix multisphere command<a class="headerlink" href="#fix-multisphere-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"><pre>fix ID group-ID multisphere</pre>
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<div class="highlight-python"><div class="highlight"><pre>fix ID group-ID multisphere
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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>multisphere = style name of this fix command</li>
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<li>zero or more keyword/value pairs may be appended</li>
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<li>keyword = <em>allow_group_and_set</em> or <em>allow_heatsource</em> or <em>CAddRhoFluid</em></li>
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<pre class="literal-block">
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<em>allow_group_and_set</em> value = 'yes' or 'no'
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yes, no = determines if group and set command are allowed in the current simulation.
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<em>allow_heatsource</em> value = 'yes' or 'no'
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yes, no = determines if heatsources are allowed in the current simulation.
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<em>CAddRhoFluid</em> value = CAdd RhoFluid
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CAdd = Coefficient for additional mass term. (Usually 0.5)
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RhoFluid = Fluid density
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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"><pre>fix ms all multisphere</pre>
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<div class="highlight-python"><div class="highlight"><pre>fix ms all multisphere
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<div class="section" id="description">
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other time-integration fixes (e.g. nve, nvt, npt), or you will be
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integrating their motion more than once each timestep.</p>
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<p>The option <em>CAddRhoFluid</em> enables additional mass terms for the integration of
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multisphere particles. These model the influence of displaced fluid on the
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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>. This means you can currently not restart a simulation
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<p>Information about this fix is written to <a class="reference internal" href="restart.html"><em>binary restart files</em></a>. This means you can restart a simulation
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using multisphere particles.</p>
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<p>None of the <a class="reference internal" href="fix_modify.html"><em>fix_modify</em></a> options are relevant to this
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fix. No global scalar or vector or per-atom quantities are stored by
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this fix for access by various <em class="xref std std-ref">output commands</em>. No parameter of this fix can be
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<dl class="docutils">
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<dt><a class="reference internal" href="fix_modify.html"><em>fix_modify</em></a> can be used to manipulate the fflag and tflag switches</dt>
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<dd>of multispheres. They can be initially defined in the</dd>
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<p><a class="reference internal" href="fix_particletemplate_multisphere.html"><em>fix_particletemplate_multisphere</em></a> command.
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The fix_modify manipulates all multispheres, not only the initially defined f/tflags from the template.</p>
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<div class="highlight-python"><div class="highlight"><pre>E.g. fix_modify ms fflag on on off tflag on on off
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<p>No global scalar or vector or per-atom quantities are stored by
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this fix for access by various <span class="xref std std-ref">output commands</span>. No parameter of this fix can be
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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 <tt class="xref doc docutils literal"><span class="pre">energy</span> <span class="pre">minimization</span></tt>.</p>
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This fix is not invoked during <code class="xref doc docutils literal"><span class="pre">energy</span> <span class="pre">minimization</span></code>.</p>
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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>Only one fix multisphere at a time is allowed.
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Heat transfer simulations are not possible when using this fix
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(e.g. <a class="reference internal" href="fix_heat_gran_conduction.html"><em>fix heat/gran/conduction</em></a>)</p>
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<p>The PUBLIC version does not support (i) parallel computation, (ii)
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restart of multisphere simulations</p>
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<div class="admonition warning">
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<p class="first admonition-title">Warning</p>
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<p class="last">All fixes or computes gathering statistical output
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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_rigid.html"><em>fix_rigid</em></a>
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<a class="reference internal" href="fix_particletemplate_sphere.html"><em>fix_particletemplate_sphere</em></a>
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<a class="reference internal" href="fix_particletemplate_multisphere.html"><em>fix_particletemplate_multisphere</em></a>
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<a class="reference internal" href="neigh_modify.html"><em>neigh_modify</em></a></p>
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<p><strong>Default:</strong> none</p>
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<div class="section" id="default">
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<h2>Default<a class="headerlink" href="#default" title="Permalink to this headline">¶</a></h2>
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<p><em>allow_group_and_set</em> = ‘no’
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<em>allow_heatsource</em> = ‘no’</p>
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