<p>Specifies that the Shardlow splitting algorithm (SSA) is to be used to
integrate the DPD equations of motion. The SSA splits the integration
into a stochastic and deterministic integration step. The fix
<em>shardlow</em> performs the stochastic integration step and must be used
in conjunction with a deterministic integrator (e.g. <aclass="reference internal"href="fix_nve.html"><spanclass="doc">fix nve</span></a> or <aclass="reference internal"href="fix_nh.html"><spanclass="doc">fix nph</span></a>). The stochastic
integration of the dissipative and random forces is performed prior to
the deterministic integration of the conservative force. Further
details regarding the method are provided in <aclass="reference internal"href="pair_dpd_fdt.html#lisal"><spanclass="std std-ref">(Lisal)</span></a> and
<p>The fix <em>shardlow</em> must be used with the <aclass="reference internal"href="pair_style.html"><spanclass="doc">pair_style dpd/fdt</span></a> or <aclass="reference internal"href="pair_style.html"><spanclass="doc">pair_style dpd/fdt/energy</span></a> command to properly initialize the
fluctuation-dissipation theorem parameter(s) sigma (and kappa, if
necessary).</p>
<p>Note that numerous variants of DPD can be specified by choosing an
appropriate combination of the integrator and <aclass="reference internal"href="pair_style.html"><spanclass="doc">pair_style dpd/fdt</span></a> command. DPD under isothermal conditions can
be specified by using fix <em>shardlow</em>, fix <em>nve</em> and pair_style
<em>dpd/fdt</em>. DPD under isoenergetic conditions can be specified by
using fix <em>shardlow</em>, fix <em>nve</em> and pair_style <em>dpd/fdt/energy</em>. DPD
under isobaric conditions can be specified by using fix shardlow, fix
<em>nph</em> and pair_style <em>dpd/fdt</em>. DPD under isoenthalpic conditions can
be specified by using fix shardlow, fix <em>nph</em> and pair_style
<em>dpd/fdt/energy</em>. Examples of each DPD variant are provided in the
examples/USER/dpd directory.</p>
</div>
<hrclass="docutils"/>
<divclass="section"id="restrictions">
<h2>Restrictions</h2>
<p>This command is part of the USER-DPD package. It is only enabled if
LAMMPS was built with that package. See the <aclass="reference internal"href="Section_start.html#start-3"><spanclass="std std-ref">Making LAMMPS</span></a> section for more info.</p>
<p>This fix is currently limited to orthogonal simulation cell
geometries.</p>
<p>This fix must be used with an additional fix that specifies time
integration, e.g. <aclass="reference internal"href="fix_nve.html"><spanclass="doc">fix nve</span></a> or <aclass="reference internal"href="fix_nh.html"><spanclass="doc">fix nph</span></a>.</p>
<p>The Shardlow splitting algorithm requires the sizes of the sub-domain
lengths to be larger than twice the cutoff+skin. Generally, the
domain decomposition is dependent on the number of processors
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