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Coeff_N - <em>linear_spline</em> values = input_filename - <em>cubic_spline</em> values = input_filename -</pre> -</div> -<div class="section" id="examples"> -<h2>Examples</h2> -<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">bocs</span> <span class="n">temp</span> <span class="mf">300.0</span> <span class="mf">300.0</span> <span class="mf">100.0</span> <span class="n">cgiso</span> <span class="mf">0.986</span> <span class="mf">0.986</span> <span class="mf">1000.0</span> <span class="n">analytic</span> <span class="mf">66476.015</span> <span class="mi">968</span> <span class="mi">2</span> <span class="mf">245030.10</span> <span class="mf">8962.20</span> - -<span class="n">fix</span> <span class="mi">1</span> <span class="nb">all</span> <span class="n">bocs</span> <span class="n">temp</span> <span class="mf">300.0</span> <span class="mf">300.0</span> <span class="mf">100.0</span> <span class="n">cgiso</span> <span class="mf">0.986</span> <span class="mf">0.986</span> <span class="mf">1000.0</span> <span class="n">cubic_spline</span> <span class="n">input_Fv</span><span class="o">.</span><span class="n">dat</span> - -<span class="n">compute</span> <span class="n">bocsPress</span> <span class="nb">all</span> <span class="n">pressureBocs</span> <span class="n">thermo_temp</span> -<span class="n">thermo_modify</span> <span class="n">press</span> <span class="n">bocsPress</span> -<span class="n">fix_modify</span> <span class="mi">1</span> <span class="n">press</span> <span class="n">bocsPress</span> -</pre></div> -</div> -</div> -<div class="section" id="description"> -<h2>Description</h2> -<p>These commands incorporate a pressure correction as described by -Dunn and Noid in <a class="reference internal" href="#bocs-dunn1"><span class="std std-ref">(Dunn1)</span></a> to the standard MTTK -barostat by Martyna et. al. in <a class="reference internal" href="#bocs-martyna"><span class="std std-ref">(Martyna)</span></a> . -The first half of the command mimics a standard fix npt command:</p> -<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">bocs</span> <span class="n">temp</span> <span class="n">Tstart</span> <span class="n">Tstop</span> <span class="n">Tcoupl</span> <span class="n">cgiso</span> <span class="n">Pstart</span> <span class="n">Pstop</span> <span class="n">Pdamp</span> -</pre></div> -</div> -<p>The two differences are replacing <em>npt</em> with <em>bocs</em>, and replacing -<em>iso</em>/<em>aniso</em>/<em>etc</em> with <em>cgiso</em>. -The rest of the command details what form you would like to use for -the pressure correction equation. The choices are: <em>analytic</em>, <em>linear_spline</em>, -or <em>cubic_spline</em>.</p> -<p>With either spline method, the only argument that needs to follow it -is the name of a file that contains the desired pressure correction -as a function of volume. The file should be formatted so each line has:</p> -<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">Volume_i</span><span class="p">,</span> <span class="n">PressureCorrection_i</span> -</pre></div> -</div> -<p>Note both the COMMA and the SPACE separating the volume’s -value and its corresponding pressure correction. The volumes in the file -should be uniformly spaced. Both the volumes and the pressure corrections -should be provided in the proper units, e.g. if you are using <em>units real</em>, -the volumes should all be in cubic angstroms, and the pressure corrections -should all be in atomspheres. Furthermore, the table should start/end at a -volume considerably smaller/larger than you expect your system to sample -during the simulation. If the system ever reaches a volume outside of the -range provided, the simulation will stop.</p> -<p>With the <em>analytic</em> option, the arguments are as follows:</p> -<div class="highlight-default"><div class="highlight"><pre><span></span><span class="o">...</span> <span class="n">analytic</span> <span class="n">V_avg</span> <span class="n">N_particles</span> <span class="n">N_coeff</span> <span class="n">Coeff_1</span> <span class="n">Coeff_2</span> <span class="o">...</span> <span class="n">Coeff_N</span> -</pre></div> -</div> -<p>Note that <em>V_avg</em> and <em>Coeff_i</em> should all be in the proper units, e.g. if you -are using <em>units real</em>, <em>V_avg</em> should be in cubic angstroms, and the -coefficients should all be in atmospheres * cubic angstroms.</p> -</div> -<div class="section" id="restrictions"> -<h2>Restrictions</h2> -<p>As this is computing a (modified) pressure, group-ID should be <em>all</em>.</p> -<p>The pressure correction has only been tested for use with an isotropic -pressure coupling in 3 dimensions.</p> -<p>There are three additional commands that must be supplied along with fix -bocs. They are given in the examples section. The name <em>bocsPress</em> can be -changed for any name of your choosing, provided it remains consistent across -all three commands. Additionally, the ID <em>1</em> in the <em>fix_modify</em> command must -match up with the <em>ID</em> specified in the original <em>fix bocs</em> command. Everything else -in those three commands must be unchanged. The first two commands can be -specified before the <em>fix bocs</em> command, but the <em>fix_modify</em> command must be -given after the original <em>fix bocs</em> command.</p> -<p>The <em>compute</em> command tells LAMMPS to compute the pressure using the modified -barostat.</p> -<p>The <em>thermo_modify</em> command tells LAMMPS to report the pressure from the modified -barostat instead of the default pressure, i.e. thermo_press.</p> -<p>The <em>fix_modify</em> command tells LAMMPS to use the pressure from the modified -barostat for the fix, instead of using the default presure, i.e. thermo_press.</p> -<p><strong>Related:</strong></p> -<p>For more details about the pressure correction and the entire BOCS software -package, visit the <a class="reference external" href="https://github.com/noid-group/BOCS">BOCS package on github</a> and read the release -paper by Dunn et. al. <a class="reference internal" href="#bocs-dunn2"><span class="std std-ref">(Dunn2)</span></a> .</p> -<hr class="docutils" /> -<p id="bocs-dunn1"><strong>(Dunn1)</strong> Dunn and Noid, J Chem Phys, 143, 243148 (2015).</p> -<p id="bocs-martyna"><strong>(Martyna)</strong> Martyna, Tobias, and Klein, J Chem Phys, 101, 4177 (1994).</p> -<p id="bocs-dunn2"><strong>(Dunn2)</strong> Dunn, Lebold, DeLyser, Rudzinski, and Noid, J. Phys. Chem. B, 122, 3363 (2018).</p> -</div> -</div> - - - </div> - </div> - <footer> - - - <hr/> - - <div role="contentinfo"> - <p> - © Copyright 2013 Sandia Corporation. - </p> - </div> - Built with <a href="http://sphinx-doc.org/">Sphinx</a> using a <a href="https://github.com/snide/sphinx_rtd_theme">theme</a> provided by <a href="https://readthedocs.org">Read the Docs</a>. - -</footer> - - </div> - </div> - - </section> - - </div> - - - - - - <script type="text/javascript"> - var DOCUMENTATION_OPTIONS = { - URL_ROOT:'./', - VERSION:'', - COLLAPSE_INDEX:false, - FILE_SUFFIX:'.html', - HAS_SOURCE: true - }; - </script> - <script type="text/javascript" src="_static/jquery.js"></script> - <script type="text/javascript" src="_static/underscore.js"></script> - <script type="text/javascript" src="_static/doctools.js"></script> - <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script> - <script type="text/javascript" src="_static/sphinxcontrib-images/LightBox2/lightbox2/js/jquery-1.11.0.min.js"></script> - <script type="text/javascript" src="_static/sphinxcontrib-images/LightBox2/lightbox2/js/lightbox.min.js"></script> - <script type="text/javascript" src="_static/sphinxcontrib-images/LightBox2/lightbox2-customize/jquery-noconflict.js"></script> - - - - - - <script type="text/javascript" src="_static/js/theme.js"></script> - - - - - <script type="text/javascript"> - jQuery(function () { - SphinxRtdTheme.StickyNav.enable(); - }); - </script> - - -</body> -</html>