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<div class="section" id="fix-shardlow-command">
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<span id="index-0"></span><h1>fix shardlow command</h1>
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<div class="section" id="syntax">
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<h2>Syntax</h2>
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<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">shardlow</span>
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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"><span class="doc">fix</span></a> command</li>
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<li>shardlow = 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</h2>
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<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">fix</span> <span class="mi">1</span> <span class="nb">all</span> <span class="n">shardlow</span>
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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</h2>
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<p>Specifies that the Shardlow splitting algorithm (SSA) is to be used to
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integrate the DPD equations of motion. The SSA splits the integration
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into a stochastic and deterministic integration step. The fix
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<em>shardlow</em> performs the stochastic integration step and must be used
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in conjunction with a deterministic integrator (e.g. <a class="reference internal" href="fix_nve.html"><span class="doc">fix nve</span></a> or <span class="xref doc">fix nph</span>). The stochastic
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integration of the dissipative and random forces is performed prior to
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the deterministic integration of the conservative force. Further
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details regarding the method are provided in <a class="reference internal" href="pair_dpd_fdt.html#lisal"><span class="std std-ref">(Lisal)</span></a> and
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<a class="reference internal" href="fix_eos_cv.html#larentzos"><span class="std std-ref">(Larentzos)</span></a>.</p>
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<p>The fix <em>shardlow</em> must be used with the <a class="reference internal" href="pair_style.html"><span class="doc">pair_style dpd/fdt</span></a> or <a class="reference internal" href="pair_style.html"><span class="doc">pair_style dpd/fdt/energy</span></a> command to properly initialize the
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fluctuation-dissipation theorem parameter(s) sigma (and kappa, if
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necessary).</p>
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<p>Note that numerous variants of DPD can be specified by choosing an
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appropriate combination of the integrator and <a class="reference internal" href="pair_style.html"><span class="doc">pair_style dpd/fdt</span></a> command. DPD under isothermal conditions can
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be specified by using fix <em>shardlow</em>, fix <em>nve</em> and pair_style
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<em>dpd/fdt</em>. DPD under isoenergetic conditions can be specified by
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using fix <em>shardlow</em>, fix <em>nve</em> and pair_style <em>dpd/fdt/energy</em>. DPD
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under isobaric conditions can be specified by using fix shardlow, fix
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<em>nph</em> and pair_style <em>dpd/fdt</em>. DPD under isoenthalpic conditions can
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be specified by using fix shardlow, fix <em>nph</em> and pair_style
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<em>dpd/fdt/energy</em>. Examples of each DPD variant are provided in the
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examples/USER/dpd directory.</p>
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</div>
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<hr class="docutils" />
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<div class="section" id="restrictions">
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<h2>Restrictions</h2>
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<p>This command is part of the USER-DPD package. It is only enabled if
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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>
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<p>This fix is currently limited to orthogonal simulation cell
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geometries.</p>
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<p>This fix must be used with an additional fix that specifies time
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integration, e.g. <a class="reference internal" href="fix_nve.html"><span class="doc">fix nve</span></a> or <a class="reference internal" href="fix_nh.html"><span class="doc">fix nph</span></a>.</p>
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<p>The Shardlow splitting algorithm requires the sizes of the sub-domain
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lengths to be larger than twice the cutoff+skin. Generally, the
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domain decomposition is dependent on the number of processors
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requested.</p>
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<p>This fix also requires <a class="reference internal" href="atom_style.html"><span class="doc">atom_style dpd</span></a> to be used
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due to shared data structures.</p>
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</div>
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<div class="section" id="related-commands">
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<h2>Related commands</h2>
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<p><a class="reference internal" href="pair_dpd_fdt.html"><span class="doc">pair_style dpd/fdt</span></a>, <a class="reference internal" href="fix_eos_cv.html"><span class="doc">fix eos/cv</span></a></p>
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<p><strong>Default:</strong> none</p>
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<hr class="docutils" />
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<p id="lisal"><strong>(Lisal)</strong> M. Lisal, J.K. Brennan, J. Bonet Avalos, “Dissipative
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particle dynamics as isothermal, isobaric, isoenergetic, and
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isoenthalpic conditions using Shardlow-like splitting algorithms.”,
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J. Chem. Phys., 135, 204105 (2011).</p>
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<p id="larentzos"><strong>(Larentzos)</strong> J.P. Larentzos, J.K. Brennan, J.D. Moore, M. Lisal and
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W.D. Mattson, “Parallel Implementation of Isothermal and Isoenergetic
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Dissipative Particle Dynamics Using Shardlow-Like Splitting
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Algorithms”, Comput. Phys. Commun., 185, 1987-1998 (2014).</p>
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<p id="id1"><strong>(Larentzos)</strong> J.P. Larentzos, J.K. Brennan, J.D. Moore, and
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W.D. Mattson, “LAMMPS Implementation of Constant Energy Dissipative
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Particle Dynamics (DPD-E)”, ARL-TR-6863, U.S. Army Research
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Laboratory, Aberdeen Proving Ground, MD (2014).</p>
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