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<li>pair_style dpd/conservative command</li>
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<div class="section" id="pair-style-dpd-conservative-command">
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<span id="index-0"></span><h1>pair_style dpd/conservative command<a class="headerlink" href="#pair-style-dpd-conservative-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>pair_style dpd/conservative cutoff
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</pre></div>
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</div>
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<ul class="simple">
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<li>cutoff = global cutoff for DPD interactions (distance units)</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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<div class="highlight-python"><div class="highlight"><pre>pair_style dpd/conservative 2.5
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pair_coeff * * 3.0 2.5
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pair_coeff 1 1 3.0
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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>Style <em>dpd/conservative</em> computes the conservative force for
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dissipative particle dynamics (DPD). The conservative force on atom I
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due to atom J is given by</p>
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<img alt="_images/pair_dpd_conservative.jpg" class="align-center" src="_images/pair_dpd_conservative.jpg" />
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<p>where the weighting factor, omega_ij, varies between 0 and 1, and is
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chosen to have the following functional form:</p>
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<img alt="_images/pair_dpd_omega.jpg" class="align-center" src="_images/pair_dpd_omega.jpg" />
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<p>where Rij is a unit vector in the direction Ri - Rj, and Rc is the
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cutoff. Note that alternative definitions of the weighting function
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exist, but would have to be implemented as a separate pair style
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command.</p>
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<p>Style <em>dpd/conservative</em> differs from the other dpd styles in that the
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dissipative and random forces are not computed within the pair style.</p>
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<p>For style <em>dpd/conservative</em>, the pairwise energy is due only to the
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conservative force term Fc, and is shifted to be zero at the cutoff
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distance Rc. The pairwise virial is calculated using only the
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conservative term.</p>
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<p>Style <em>dpd/conservative</em> requires the following coefficients to be
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defined for each pair of atoms types via the
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<a class="reference internal" href="pair_coeff.html"><em>pair_coeff</em></a> command as in the examples above, or in
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the data file or restart files read by the <a class="reference internal" href="read_data.html"><em>read_data</em></a>
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or <a class="reference internal" href="read_restart.html"><em>read_restart</em></a> commands:</p>
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<ul class="simple">
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<li>A (force units)</li>
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<li>cutoff (distance units)</li>
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</ul>
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<p>The last coefficient is optional. If not specified, the global DPD
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cutoff is used.</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<a class="headerlink" href="#restrictions" title="Permalink to this headline">¶</a></h2>
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<p>The pair style <em>dpd/conservative</em> is only available if LAMMPS is built
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with the USER-DPD package.</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="pair_coeff.html"><em>pair_coeff</em></a>, <a class="reference internal" href="pair_dpd.html"><em>pair_dpd</em></a></p>
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<p><strong>Default:</strong> none</p>
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