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@ -363,8 +363,8 @@ commands like <a class="reference internal" href="pair_coeff.html"><em>pair_coef
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<a class="reference internal" href="bond_coeff.html"><em>bond_coeff</em></a>. See <a class="reference internal" href="Section_tools.html"><em>Section_tools</em></a>
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<a class="reference internal" href="bond_coeff.html"><em>bond_coeff</em></a>. See <a class="reference internal" href="Section_tools.html"><em>Section_tools</em></a>
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for additional tools that can use CHARMM or AMBER to assign force
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for additional tools that can use CHARMM or AMBER to assign force
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field coefficients and convert their output into LAMMPS input.</p>
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field coefficients and convert their output into LAMMPS input.</p>
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<p>See <a class="reference internal" href="special_bonds.html#mackerell"><span>(MacKerell)</span></a> for a description of the CHARMM force
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<p>See <a class="reference internal" href="pair_charmm.html#mackerell"><span>(MacKerell)</span></a> for a description of the CHARMM force
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field. See <a class="reference internal" href="special_bonds.html#cornell"><span>(Cornell)</span></a> for a description of the AMBER force
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field. See <a class="reference internal" href="dihedral_charmm.html#cornell"><span>(Cornell)</span></a> for a description of the AMBER force
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field.</p>
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field.</p>
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<p>These style choices compute force field formulas that are consistent
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<p>These style choices compute force field formulas that are consistent
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with common options in CHARMM or AMBER. See each command’s
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with common options in CHARMM or AMBER. See each command’s
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@ -389,7 +389,7 @@ atoms involved in the bond, angle, or torsion terms. DREIDING has an
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<a class="reference internal" href="pair_hbond_dreiding.html"><em>explicit hydrogen bond term</em></a> to describe
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<a class="reference internal" href="pair_hbond_dreiding.html"><em>explicit hydrogen bond term</em></a> to describe
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interactions involving a hydrogen atom on very electronegative atoms
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interactions involving a hydrogen atom on very electronegative atoms
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(N, O, F).</p>
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(N, O, F).</p>
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<p>See <a class="reference internal" href="special_bonds.html#mayo"><span>(Mayo)</span></a> for a description of the DREIDING force field</p>
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<p>See <a class="reference internal" href="pair_hbond_dreiding.html#mayo"><span>(Mayo)</span></a> for a description of the DREIDING force field</p>
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<p>These style choices compute force field formulas that are consistent
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<p>These style choices compute force field formulas that are consistent
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with the DREIDING force field. See each command’s
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with the DREIDING force field. See each command’s
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documentation for the formula it computes.</p>
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documentation for the formula it computes.</p>
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@ -587,7 +587,7 @@ computations between frozen atoms by using this command:</p>
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<div class="section" id="tip3p-water-model">
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<div class="section" id="tip3p-water-model">
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<span id="howto-7"></span><h2>6.7. TIP3P water model<a class="headerlink" href="#tip3p-water-model" title="Permalink to this headline">¶</a></h2>
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<span id="howto-7"></span><h2>6.7. TIP3P water model<a class="headerlink" href="#tip3p-water-model" title="Permalink to this headline">¶</a></h2>
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<p>The TIP3P water model as implemented in CHARMM
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<p>The TIP3P water model as implemented in CHARMM
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<a class="reference internal" href="special_bonds.html#mackerell"><span>(MacKerell)</span></a> specifies a 3-site rigid water molecule with
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<a class="reference internal" href="pair_charmm.html#mackerell"><span>(MacKerell)</span></a> specifies a 3-site rigid water molecule with
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charges and Lennard-Jones parameters assigned to each of the 3 atoms.
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charges and Lennard-Jones parameters assigned to each of the 3 atoms.
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In LAMMPS the <a class="reference internal" href="fix_shake.html"><em>fix shake</em></a> command can be used to hold
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In LAMMPS the <a class="reference internal" href="fix_shake.html"><em>fix shake</em></a> command can be used to hold
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the two O-H bonds and the H-O-H angle rigid. A bond style of
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the two O-H bonds and the H-O-H angle rigid. A bond style of
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@ -766,7 +766,7 @@ the partial charge assignemnts change:</p>
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<div class="line">H charge = 0.4238</div>
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<div class="line">H charge = 0.4238</div>
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<div class="line"><br /></div>
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<div class="line"><br /></div>
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</div>
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</div>
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<p>See the <a class="reference internal" href="fix_temp_berendsen.html#berendsen"><span>(Berendsen)</span></a> reference for more details on both
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<p>See the <a class="reference internal" href="#berendsen"><span>(Berendsen)</span></a> reference for more details on both
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the SPC and SPC/E models.</p>
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the SPC and SPC/E models.</p>
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<p>Wikipedia also has a nice article on <a class="reference external" href="http://en.wikipedia.org/wiki/Water_model">water models</a>.</p>
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<p>Wikipedia also has a nice article on <a class="reference external" href="http://en.wikipedia.org/wiki/Water_model">water models</a>.</p>
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<hr class="docutils" />
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<hr class="docutils" />
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@ -2749,7 +2749,7 @@ fix ave_chunk all ave/time 10 1 10 c_cstherm file chunk.dump mode vector
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model, representes induced dipoles by a pair of charges (the core atom
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model, representes induced dipoles by a pair of charges (the core atom
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and the Drude particle) connected by a harmonic spring. The Drude
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and the Drude particle) connected by a harmonic spring. The Drude
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model has a number of features aimed at its use in molecular systems
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model has a number of features aimed at its use in molecular systems
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(<a class="reference internal" href="tutorial_drude.html#lamoureux"><span>Lamoureux and Roux</span></a>):</p>
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(<a class="reference internal" href="#lamoureux"><span>Lamoureux and Roux</span></a>):</p>
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<ul class="simple">
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<ul class="simple">
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<li>Thermostating of the additional degrees of freedom associated with the
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<li>Thermostating of the additional degrees of freedom associated with the
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induced dipoles at very low temperature, in terms of the reduced
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induced dipoles at very low temperature, in terms of the reduced
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@ -152,7 +152,7 @@ angle_coeff 1 300.0 107.0 50.0 3.0
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<p>with an additional Urey_Bradley term based on the distance <em>r</em> between
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<p>with an additional Urey_Bradley term based on the distance <em>r</em> between
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the 1st and 3rd atoms in the angle. K, theta0, Kub, and Rub are
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the 1st and 3rd atoms in the angle. K, theta0, Kub, and Rub are
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coefficients defined for each angle type.</p>
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coefficients defined for each angle type.</p>
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<p>See <a class="reference internal" href="special_bonds.html#mackerell"><span>(MacKerell)</span></a> for a description of the CHARMM force
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<p>See <a class="reference internal" href="pair_charmm.html#mackerell"><span>(MacKerell)</span></a> for a description of the CHARMM force
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field.</p>
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field.</p>
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<p>The following coefficients must be defined for each angle type via the
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<p>The following coefficients must be defined for each angle type via the
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<a class="reference internal" href="angle_coeff.html"><em>angle_coeff</em></a> command as in the example above, or in
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<a class="reference internal" href="angle_coeff.html"><em>angle_coeff</em></a> command as in the example above, or in
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@ -151,7 +151,7 @@ angle_coeff * ba 3.6551 24.895 1.0119 1.5228
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<p>where Ea is the angle term, Ebb is a bond-bond term, and Eba is a
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<p>where Ea is the angle term, Ebb is a bond-bond term, and Eba is a
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bond-angle term. Theta0 is the equilibrium angle and r1 and r2 are
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bond-angle term. Theta0 is the equilibrium angle and r1 and r2 are
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the equilibrium bond lengths.</p>
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the equilibrium bond lengths.</p>
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<p>See <a class="reference internal" href="pair_modify.html#sun"><span>(Sun)</span></a> for a description of the COMPASS class2 force field.</p>
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<p>See <a class="reference internal" href="pair_class2.html#sun"><span>(Sun)</span></a> for a description of the COMPASS class2 force field.</p>
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<p>Coefficients for the Ea, Ebb, and Eba formulas must be defined for
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<p>Coefficients for the Ea, Ebb, and Eba formulas must be defined for
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each angle type via the <a class="reference internal" href="angle_coeff.html"><em>angle_coeff</em></a> command as in
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each angle type via the <a class="reference internal" href="angle_coeff.html"><em>angle_coeff</em></a> command as in
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the example above, or in the data file or restart files read by the
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the example above, or in the data file or restart files read by the
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@ -151,7 +151,7 @@ used for an octahedral complex and <em>n</em> = 3 might be used for a
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trigonal center:</p>
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trigonal center:</p>
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<img alt="_images/angle_cosine_periodic.jpg" class="align-center" src="_images/angle_cosine_periodic.jpg" />
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<img alt="_images/angle_cosine_periodic.jpg" class="align-center" src="_images/angle_cosine_periodic.jpg" />
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<p>where C, B and n are coefficients defined for each angle type.</p>
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<p>where C, B and n are coefficients defined for each angle type.</p>
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<p>See <a class="reference internal" href="special_bonds.html#mayo"><span>(Mayo)</span></a> for a description of the DREIDING force field</p>
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<p>See <a class="reference internal" href="pair_hbond_dreiding.html#mayo"><span>(Mayo)</span></a> for a description of the DREIDING force field</p>
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<p>The following coefficients must be defined for each angle type via the
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<p>The following coefficients must be defined for each angle type via the
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<a class="reference internal" href="angle_coeff.html"><em>angle_coeff</em></a> command as in the example above, or in
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<a class="reference internal" href="angle_coeff.html"><em>angle_coeff</em></a> command as in the example 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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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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@ -147,7 +147,7 @@ bond_coeff 1 1.0 100.0 80.0 80.0
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<p>The <em>class2</em> bond style uses the potential</p>
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<p>The <em>class2</em> bond style uses the potential</p>
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<img alt="_images/bond_class2.jpg" class="align-center" src="_images/bond_class2.jpg" />
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<img alt="_images/bond_class2.jpg" class="align-center" src="_images/bond_class2.jpg" />
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<p>where r0 is the equilibrium bond distance.</p>
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<p>where r0 is the equilibrium bond distance.</p>
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<p>See <a class="reference internal" href="pair_modify.html#sun"><span>(Sun)</span></a> for a description of the COMPASS class2 force field.</p>
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<p>See <a class="reference internal" href="pair_class2.html#sun"><span>(Sun)</span></a> for a description of the COMPASS class2 force field.</p>
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<p>The following coefficients must be defined for each bond type via the
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<p>The following coefficients must be defined for each bond type via the
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<a class="reference internal" href="bond_coeff.html"><em>bond_coeff</em></a> command as in the example above, or in
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<a class="reference internal" href="bond_coeff.html"><em>bond_coeff</em></a> command as in the example 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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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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@ -150,7 +150,7 @@ bond_coeff 1 30.0 1.5 1.0 1.0
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<p>The <em>fene</em> bond style uses the potential</p>
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<p>The <em>fene</em> bond style uses the potential</p>
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<img alt="_images/bond_fene.jpg" class="align-center" src="_images/bond_fene.jpg" />
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<img alt="_images/bond_fene.jpg" class="align-center" src="_images/bond_fene.jpg" />
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<p>to define a finite extensible nonlinear elastic (FENE) potential
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<p>to define a finite extensible nonlinear elastic (FENE) potential
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<a class="reference internal" href="special_bonds.html#kremer"><span>(Kremer)</span></a>, used for bead-spring polymer models. The first
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<a class="reference internal" href="bond_fene_expand.html#kremer"><span>(Kremer)</span></a>, used for bead-spring polymer models. The first
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term is attractive, the 2nd Lennard-Jones term is repulsive. The
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term is attractive, the 2nd Lennard-Jones term is repulsive. The
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first term extends to R0, the maximum extent of the bond. The 2nd
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first term extends to R0, the maximum extent of the bond. The 2nd
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term is cutoff at 2^(1/6) sigma, the minimum of the LJ potential.</p>
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term is cutoff at 2^(1/6) sigma, the minimum of the LJ potential.</p>
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@ -147,7 +147,7 @@ bond_coeff 1 30.0 1.5 1.0 1.0 0.5
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<p>The <em>fene/expand</em> bond style uses the potential</p>
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<p>The <em>fene/expand</em> bond style uses the potential</p>
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<img alt="_images/bond_fene_expand.jpg" class="align-center" src="_images/bond_fene_expand.jpg" />
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<img alt="_images/bond_fene_expand.jpg" class="align-center" src="_images/bond_fene_expand.jpg" />
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<p>to define a finite extensible nonlinear elastic (FENE) potential
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<p>to define a finite extensible nonlinear elastic (FENE) potential
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<a class="reference internal" href="special_bonds.html#kremer"><span>(Kremer)</span></a>, used for bead-spring polymer models. The first
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<a class="reference internal" href="#kremer"><span>(Kremer)</span></a>, used for bead-spring polymer models. The first
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term is attractive, the 2nd Lennard-Jones term is repulsive.</p>
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term is attractive, the 2nd Lennard-Jones term is repulsive.</p>
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<p>The <em>fene/expand</em> bond style is similar to <em>fene</em> except that an extra
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<p>The <em>fene/expand</em> bond style is similar to <em>fene</em> except that an extra
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shift factor of delta (positive or negative) is added to <em>r</em> to
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shift factor of delta (positive or negative) is added to <em>r</em> to
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@ -169,7 +169,7 @@ fix saed/vtk 1 1 1 c_2 file Ni_000.saed
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<div class="section" id="description">
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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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<h2>Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
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<p>Define a computation that calculates electron diffraction intensity as
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<p>Define a computation that calculates electron diffraction intensity as
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described in <a class="reference internal" href="fix_saed_vtk.html#coleman"><span>(Coleman)</span></a> on a mesh of reciprocal lattice nodes
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described in <a class="reference internal" href="compute_xrd.html#coleman"><span>(Coleman)</span></a> on a mesh of reciprocal lattice nodes
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defined by the entire simulation domain (or manually) using simulated
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defined by the entire simulation domain (or manually) using simulated
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radiation of wavelength lambda.</p>
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radiation of wavelength lambda.</p>
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<p>The electron diffraction intensity I at each reciprocal lattice point
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<p>The electron diffraction intensity I at each reciprocal lattice point
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@ -167,7 +167,7 @@ fix 2 all ave/histo/weight 1 1 1 10 100 250 c_2[1] c_2[2] mode vector file Deg2T
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<div class="section" id="description">
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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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<h2>Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
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<p>Define a computation that calculates x-ray diffraction intensity as described
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<p>Define a computation that calculates x-ray diffraction intensity as described
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in <a class="reference internal" href="fix_saed_vtk.html#coleman"><span>(Coleman)</span></a> on a mesh of reciprocal lattice nodes defined
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in <a class="reference internal" href="#coleman"><span>(Coleman)</span></a> on a mesh of reciprocal lattice nodes defined
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by the entire simulation domain (or manually) using a simulated radiation
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by the entire simulation domain (or manually) using a simulated radiation
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of wavelength lambda.</p>
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of wavelength lambda.</p>
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<p>The x-ray diffraction intensity, I, at each reciprocal lattice point, k,
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<p>The x-ray diffraction intensity, I, at each reciprocal lattice point, k,
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@ -149,9 +149,9 @@ dihedral_coeff 1 120.0 1 60 0.5
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<h2>Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
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<h2>Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
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<p>The <em>charmm</em> dihedral style uses the potential</p>
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<p>The <em>charmm</em> dihedral style uses the potential</p>
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<img alt="_images/dihedral_charmm.jpg" class="align-center" src="_images/dihedral_charmm.jpg" />
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<img alt="_images/dihedral_charmm.jpg" class="align-center" src="_images/dihedral_charmm.jpg" />
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<p>See <a class="reference internal" href="special_bonds.html#mackerell"><span>(MacKerell)</span></a> for a description of the CHARMM force
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<p>See <a class="reference internal" href="pair_charmm.html#mackerell"><span>(MacKerell)</span></a> for a description of the CHARMM force
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field. This dihedral style can also be used for the AMBER force field
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field. This dihedral style can also be used for the AMBER force field
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(see comment on weighting factors below). See <a class="reference internal" href="special_bonds.html#cornell"><span>(Cornell)</span></a>
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(see comment on weighting factors below). See <a class="reference internal" href="#cornell"><span>(Cornell)</span></a>
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for a description of the AMBER force field.</p>
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for a description of the AMBER force field.</p>
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<p>The following coefficients must be defined for each dihedral type via the
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<p>The following coefficients must be defined for each dihedral type via the
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<a class="reference internal" href="dihedral_coeff.html"><em>dihedral_coeff</em></a> command as in the example above, or in
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<a class="reference internal" href="dihedral_coeff.html"><em>dihedral_coeff</em></a> command as in the example above, or in
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@ -156,7 +156,7 @@ Eebt is an end-bond-torsion term, Eat is an angle-torsion term, Eaat
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is an angle-angle-torsion term, and Ebb13 is a bond-bond-13 term.</p>
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is an angle-angle-torsion term, and Ebb13 is a bond-bond-13 term.</p>
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<p>Theta1 and theta2 are equilibrium angles and r1 r2 r3 are equilibrium
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<p>Theta1 and theta2 are equilibrium angles and r1 r2 r3 are equilibrium
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bond lengths.</p>
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bond lengths.</p>
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<p>See <a class="reference internal" href="pair_modify.html#sun"><span>(Sun)</span></a> for a description of the COMPASS class2 force field.</p>
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<p>See <a class="reference internal" href="pair_class2.html#sun"><span>(Sun)</span></a> for a description of the COMPASS class2 force field.</p>
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<p>Coefficients for the Ed, Embt, Eebt, Eat, Eaat, and Ebb13 formulas
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<p>Coefficients for the Ed, Embt, Eebt, Eat, Eaat, and Ebb13 formulas
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must be defined for each dihedral type via the
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must be defined for each dihedral type via the
|
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<a class="reference internal" href="dihedral_coeff.html"><em>dihedral_coeff</em></a> command as in the example above,
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<a class="reference internal" href="dihedral_coeff.html"><em>dihedral_coeff</em></a> command as in the example above,
|
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@ -210,7 +210,7 @@ finite difference LB integrator is used. If <em>LBtype</em> is set equal to
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functions,</p>
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functions,</p>
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<img alt="_images/fix_lb_fluid_properties.jpg" class="align-center" src="_images/fix_lb_fluid_properties.jpg" />
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<img alt="_images/fix_lb_fluid_properties.jpg" class="align-center" src="_images/fix_lb_fluid_properties.jpg" />
|
||||||
<p>Full details of the lattice-Boltzmann algorithm used can be found in
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<p>Full details of the lattice-Boltzmann algorithm used can be found in
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||||||
<a class="reference internal" href="fix_lb_viscous.html#mackay"><span>Mackay et al.</span></a>.</p>
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<a class="reference internal" href="#mackay"><span>Mackay et al.</span></a>.</p>
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<p>The fluid is coupled to the MD particles described by <em>group-ID</em>
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<p>The fluid is coupled to the MD particles described by <em>group-ID</em>
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through a velocity dependent force. The contribution to the fluid
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through a velocity dependent force. The contribution to the fluid
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force on a given lattice mesh site j due to MD particle alpha is
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force on a given lattice mesh site j due to MD particle alpha is
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@ -242,7 +242,7 @@ using the <em>setArea</em> keyword.</p>
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<p>The user also has the option of specifying their own value for the
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<p>The user also has the option of specifying their own value for the
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force coupling constant, for all the MD particles associated with the
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force coupling constant, for all the MD particles associated with the
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fix, through the use of the <em>setGamma</em> keyword. This may be useful
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fix, through the use of the <em>setGamma</em> keyword. This may be useful
|
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when modelling porous particles. See <a class="reference internal" href="fix_lb_viscous.html#mackay"><span>Mackay et al.</span></a> for a
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when modelling porous particles. See <a class="reference internal" href="#mackay"><span>Mackay et al.</span></a> for a
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detailed description of the method by which the user can choose an
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detailed description of the method by which the user can choose an
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appropriate gamma value.</p>
|
appropriate gamma value.</p>
|
||||||
<div class="admonition note">
|
<div class="admonition note">
|
||||||
|
@ -256,7 +256,7 @@ This fix adds the hydrodynamic force to the total force acting on the
|
||||||
particles, after which any of the built-in LAMMPS integrators can be
|
particles, after which any of the built-in LAMMPS integrators can be
|
||||||
used to integrate the particle motion. However, if the user specifies
|
used to integrate the particle motion. However, if the user specifies
|
||||||
their own value for the force coupling constant, as mentioned in
|
their own value for the force coupling constant, as mentioned in
|
||||||
<a class="reference internal" href="fix_lb_viscous.html#mackay"><span>Mackay et al.</span></a>, the built-in LAMMPS integrators may prove to
|
<a class="reference internal" href="#mackay"><span>Mackay et al.</span></a>, the built-in LAMMPS integrators may prove to
|
||||||
be unstable. Therefore, we have included our own integrators <a class="reference internal" href="fix_lb_rigid_pc_sphere.html"><em>fix lb/rigid/pc/sphere</em></a>, and <a class="reference internal" href="fix_lb_pc.html"><em>fix lb/pc</em></a>, to solve for the particle motion in these
|
be unstable. Therefore, we have included our own integrators <a class="reference internal" href="fix_lb_rigid_pc_sphere.html"><em>fix lb/rigid/pc/sphere</em></a>, and <a class="reference internal" href="fix_lb_pc.html"><em>fix lb/pc</em></a>, to solve for the particle motion in these
|
||||||
cases. These integrators should not be used with the
|
cases. These integrators should not be used with the
|
||||||
<a class="reference internal" href="fix_lb_viscous.html"><em>lb/viscous</em></a> fix, as they add hydrodynamic forces
|
<a class="reference internal" href="fix_lb_viscous.html"><em>lb/viscous</em></a> fix, as they add hydrodynamic forces
|
||||||
|
@ -341,7 +341,7 @@ N timesteps.</p>
|
||||||
<p>If the keyword <em>trilinear</em> is used, the trilinear stencil is used to
|
<p>If the keyword <em>trilinear</em> is used, the trilinear stencil is used to
|
||||||
interpolate the particle nodes onto the fluid mesh. By default, the
|
interpolate the particle nodes onto the fluid mesh. By default, the
|
||||||
immersed boundary method, Peskin stencil is used. Both of these
|
immersed boundary method, Peskin stencil is used. Both of these
|
||||||
interpolation methods are described in <a class="reference internal" href="fix_lb_viscous.html#mackay"><span>Mackay et al.</span></a>.</p>
|
interpolation methods are described in <a class="reference internal" href="#mackay"><span>Mackay et al.</span></a>.</p>
|
||||||
<p>If the keyword <em>D3Q19</em> is used, the 19 velocity (D3Q19) lattice is
|
<p>If the keyword <em>D3Q19</em> is used, the 19 velocity (D3Q19) lattice is
|
||||||
used by the lattice-Boltzmann algorithm. By default, the 15 velocity
|
used by the lattice-Boltzmann algorithm. By default, the 15 velocity
|
||||||
(D3Q15) lattice is used.</p>
|
(D3Q15) lattice is used.</p>
|
||||||
|
@ -371,7 +371,7 @@ the fluid densities and velocities at each lattice site are printed to the
|
||||||
screen every N timesteps.</p>
|
screen every N timesteps.</p>
|
||||||
<hr class="docutils" />
|
<hr class="docutils" />
|
||||||
<p>For further details, as well as descriptions and results of several
|
<p>For further details, as well as descriptions and results of several
|
||||||
test runs, see <a class="reference internal" href="fix_lb_viscous.html#mackay"><span>Mackay et al.</span></a>. Please include a citation to
|
test runs, see <a class="reference internal" href="#mackay"><span>Mackay et al.</span></a>. Please include a citation to
|
||||||
this paper if the lb_fluid fix is used in work contributing to
|
this paper if the lb_fluid fix is used in work contributing to
|
||||||
published research.</p>
|
published research.</p>
|
||||||
</div>
|
</div>
|
||||||
|
|
|
@ -233,11 +233,11 @@ particles will match the target values specified by Tstart/Tstop and
|
||||||
Pstart/Pstop.</p>
|
Pstart/Pstop.</p>
|
||||||
<p>The equations of motion used are those of Shinoda et al in
|
<p>The equations of motion used are those of Shinoda et al in
|
||||||
<a class="reference internal" href="pair_sdk.html#shinoda"><span>(Shinoda)</span></a>, which combine the hydrostatic equations of
|
<a class="reference internal" href="pair_sdk.html#shinoda"><span>(Shinoda)</span></a>, which combine the hydrostatic equations of
|
||||||
Martyna, Tobias and Klein in <a class="reference internal" href="fix_rigid.html#martyna"><span>(Martyna)</span></a> with the strain
|
Martyna, Tobias and Klein in <a class="reference internal" href="#martyna"><span>(Martyna)</span></a> with the strain
|
||||||
energy proposed by Parrinello and Rahman in
|
energy proposed by Parrinello and Rahman in
|
||||||
<a class="reference internal" href="fix_nh_eff.html#parrinello"><span>(Parrinello)</span></a>. The time integration schemes closely
|
<a class="reference internal" href="#parrinello"><span>(Parrinello)</span></a>. The time integration schemes closely
|
||||||
follow the time-reversible measure-preserving Verlet and rRESPA
|
follow the time-reversible measure-preserving Verlet and rRESPA
|
||||||
integrators derived by Tuckerman et al in <a class="reference internal" href="run_style.html#tuckerman"><span>(Tuckerman)</span></a>.</p>
|
integrators derived by Tuckerman et al in <a class="reference internal" href="fix_pimd.html#tuckerman"><span>(Tuckerman)</span></a>.</p>
|
||||||
<hr class="docutils" />
|
<hr class="docutils" />
|
||||||
<p>The thermostat parameters for fix styles <em>nvt</em> and <em>npt</em> is specified
|
<p>The thermostat parameters for fix styles <em>nvt</em> and <em>npt</em> is specified
|
||||||
using the <em>temp</em> keyword. Other thermostat-related keywords are
|
using the <em>temp</em> keyword. Other thermostat-related keywords are
|
||||||
|
@ -394,7 +394,7 @@ freedom. A value of 0 corresponds to no thermostatting of the
|
||||||
barostat variables.</p>
|
barostat variables.</p>
|
||||||
<p>The <em>mtk</em> keyword controls whether or not the correction terms due to
|
<p>The <em>mtk</em> keyword controls whether or not the correction terms due to
|
||||||
Martyna, Tuckerman, and Klein are included in the equations of motion
|
Martyna, Tuckerman, and Klein are included in the equations of motion
|
||||||
<a class="reference internal" href="fix_rigid.html#martyna"><span>(Martyna)</span></a>. Specifying <em>no</em> reproduces the original
|
<a class="reference internal" href="#martyna"><span>(Martyna)</span></a>. Specifying <em>no</em> reproduces the original
|
||||||
Hoover barostat, whose volume probability distribution function
|
Hoover barostat, whose volume probability distribution function
|
||||||
differs from the true NPT and NPH ensembles by a factor of 1/V. Hence
|
differs from the true NPT and NPH ensembles by a factor of 1/V. Hence
|
||||||
using <em>yes</em> is more correct, but in many cases the difference is
|
using <em>yes</em> is more correct, but in many cases the difference is
|
||||||
|
@ -403,7 +403,7 @@ negligible.</p>
|
||||||
scheme at little extra cost. The initial and final updates of the
|
scheme at little extra cost. The initial and final updates of the
|
||||||
thermostat variables are broken up into <em>tloop</em> substeps, each of
|
thermostat variables are broken up into <em>tloop</em> substeps, each of
|
||||||
length <em>dt</em>/<em>tloop</em>. This corresponds to using a first-order
|
length <em>dt</em>/<em>tloop</em>. This corresponds to using a first-order
|
||||||
Suzuki-Yoshida scheme <a class="reference internal" href="run_style.html#tuckerman"><span>(Tuckerman)</span></a>. The keyword <em>ploop</em>
|
Suzuki-Yoshida scheme <a class="reference internal" href="fix_pimd.html#tuckerman"><span>(Tuckerman)</span></a>. The keyword <em>ploop</em>
|
||||||
does the same thing for the barostat thermostat.</p>
|
does the same thing for the barostat thermostat.</p>
|
||||||
<p>The keyword <em>nreset</em> controls how often the reference dimensions used
|
<p>The keyword <em>nreset</em> controls how often the reference dimensions used
|
||||||
to define the strain energy are reset. If this keyword is not used,
|
to define the strain energy are reset. If this keyword is not used,
|
||||||
|
|
|
@ -171,7 +171,7 @@ index (the second term in the effective potential above). The
|
||||||
quasi-beads also interact with the two neighboring quasi-beads through
|
quasi-beads also interact with the two neighboring quasi-beads through
|
||||||
the spring potential in imaginary-time space (first term in effective
|
the spring potential in imaginary-time space (first term in effective
|
||||||
potential). To sample the canonical ensemble, a Nose-Hoover massive
|
potential). To sample the canonical ensemble, a Nose-Hoover massive
|
||||||
chain thermostat is applied <a class="reference internal" href="run_style.html#tuckerman"><span>(Tuckerman)</span></a>. With the
|
chain thermostat is applied <a class="reference internal" href="#tuckerman"><span>(Tuckerman)</span></a>. With the
|
||||||
massive chain algorithm, a chain of NH thermostats is coupled to each
|
massive chain algorithm, a chain of NH thermostats is coupled to each
|
||||||
degree of freedom for each quasi-bead. The keyword <em>temp</em> sets the
|
degree of freedom for each quasi-bead. The keyword <em>temp</em> sets the
|
||||||
target temperature for the system and the keyword <em>nhc</em> sets the
|
target temperature for the system and the keyword <em>nhc</em> sets the
|
||||||
|
|
|
@ -165,7 +165,7 @@ theta angles, since it is always the center atom.</p>
|
||||||
<p>Since atom J is the atom of symmetry, normally the bonds J-I, J-K, J-L
|
<p>Since atom J is the atom of symmetry, normally the bonds J-I, J-K, J-L
|
||||||
would exist for an improper to be defined between the 4 atoms, but
|
would exist for an improper to be defined between the 4 atoms, but
|
||||||
this is not required.</p>
|
this is not required.</p>
|
||||||
<p>See <a class="reference internal" href="pair_modify.html#sun"><span>(Sun)</span></a> for a description of the COMPASS class2 force field.</p>
|
<p>See <a class="reference internal" href="pair_class2.html#sun"><span>(Sun)</span></a> for a description of the COMPASS class2 force field.</p>
|
||||||
<p>Coefficients for the Ei and Eaa formulas must be defined for each
|
<p>Coefficients for the Ei and Eaa formulas must be defined for each
|
||||||
improper type via the <a class="reference internal" href="improper_coeff.html"><em>improper_coeff</em></a> command as
|
improper type via the <a class="reference internal" href="improper_coeff.html"><em>improper_coeff</em></a> command as
|
||||||
in the example above, or in the data file or restart files read by the
|
in the example above, or in the data file or restart files read by the
|
||||||
|
|
|
@ -154,7 +154,7 @@ axis and the IJK plane:</p>
|
||||||
<p>If omega0 = 0 the potential term has a minimum for the planar
|
<p>If omega0 = 0 the potential term has a minimum for the planar
|
||||||
structure. Otherwise it has two minima at +/- omega0, with a barrier
|
structure. Otherwise it has two minima at +/- omega0, with a barrier
|
||||||
in between.</p>
|
in between.</p>
|
||||||
<p>See <a class="reference internal" href="special_bonds.html#mayo"><span>(Mayo)</span></a> for a description of the DREIDING force field.</p>
|
<p>See <a class="reference internal" href="pair_hbond_dreiding.html#mayo"><span>(Mayo)</span></a> for a description of the DREIDING force field.</p>
|
||||||
<p>The following coefficients must be defined for each improper type via
|
<p>The following coefficients must be defined for each improper type via
|
||||||
the <a class="reference internal" href="improper_coeff.html"><em>improper_coeff</em></a> command as in the example
|
the <a class="reference internal" href="improper_coeff.html"><em>improper_coeff</em></a> command as in the example
|
||||||
above, or in the data file or restart files read by the
|
above, or in the data file or restart files read by the
|
||||||
|
|
|
@ -222,7 +222,7 @@ pair_coeff 1 1 100.0 2.0 150.0 3.5
|
||||||
additional switching function S(r) that ramps the energy and force
|
additional switching function S(r) that ramps the energy and force
|
||||||
smoothly to zero between an inner and outer cutoff. It is a widely
|
smoothly to zero between an inner and outer cutoff. It is a widely
|
||||||
used potential in the <a class="reference external" href="http://www.scripps.edu/brooks">CHARMM</a> MD code.
|
used potential in the <a class="reference external" href="http://www.scripps.edu/brooks">CHARMM</a> MD code.
|
||||||
See <a class="reference internal" href="special_bonds.html#mackerell"><span>(MacKerell)</span></a> for a description of the CHARMM force
|
See <a class="reference internal" href="#mackerell"><span>(MacKerell)</span></a> for a description of the CHARMM force
|
||||||
field.</p>
|
field.</p>
|
||||||
<img alt="_images/pair_charmm.jpg" class="align-center" src="_images/pair_charmm.jpg" />
|
<img alt="_images/pair_charmm.jpg" class="align-center" src="_images/pair_charmm.jpg" />
|
||||||
<p>Both the LJ and Coulombic terms require an inner and outer cutoff.
|
<p>Both the LJ and Coulombic terms require an inner and outer cutoff.
|
||||||
|
|
|
@ -213,7 +213,7 @@ pair_coeff 1 1 100.0 3.5 9.0
|
||||||
<p>Rc is the cutoff.</p>
|
<p>Rc is the cutoff.</p>
|
||||||
<p>The <em>lj/class2/coul/cut</em> and <em>lj/class2/coul/long</em> styles add a
|
<p>The <em>lj/class2/coul/cut</em> and <em>lj/class2/coul/long</em> styles add a
|
||||||
Coulombic term as described for the <a class="reference internal" href="pair_lj.html"><em>lj/cut</em></a> pair styles.</p>
|
Coulombic term as described for the <a class="reference internal" href="pair_lj.html"><em>lj/cut</em></a> pair styles.</p>
|
||||||
<p>See <a class="reference internal" href="pair_modify.html#sun"><span>(Sun)</span></a> for a description of the COMPASS class2 force field.</p>
|
<p>See <a class="reference internal" href="#sun"><span>(Sun)</span></a> for a description of the COMPASS class2 force field.</p>
|
||||||
<p>The following coefficients must be defined for each pair of atoms
|
<p>The following coefficients must be defined for each pair of atoms
|
||||||
types via the <a class="reference internal" href="pair_coeff.html"><em>pair_coeff</em></a> command as in the examples
|
types via the <a class="reference internal" href="pair_coeff.html"><em>pair_coeff</em></a> command as in the examples
|
||||||
above, or in the data file or restart files read by the
|
above, or in the data file or restart files read by the
|
||||||
|
|
|
@ -181,7 +181,7 @@ the donor atom, e.g. in a bond list read in from a data file via the
|
||||||
hydrogen atoms for each donor/acceptor type pair are specified by the
|
hydrogen atoms for each donor/acceptor type pair are specified by the
|
||||||
<a class="reference internal" href="pair_coeff.html"><em>pair_coeff</em></a> command (see below).</p>
|
<a class="reference internal" href="pair_coeff.html"><em>pair_coeff</em></a> command (see below).</p>
|
||||||
<p>Style <em>hbond/dreiding/lj</em> is the original DREIDING potential of
|
<p>Style <em>hbond/dreiding/lj</em> is the original DREIDING potential of
|
||||||
<a class="reference internal" href="special_bonds.html#mayo"><span>(Mayo)</span></a>. It uses a LJ 12/10 functional for the Donor-Acceptor
|
<a class="reference internal" href="#mayo"><span>(Mayo)</span></a>. It uses a LJ 12/10 functional for the Donor-Acceptor
|
||||||
interactions. To match the results in the original paper, use n = 4.</p>
|
interactions. To match the results in the original paper, use n = 4.</p>
|
||||||
<p>Style <em>hbond/dreiding/morse</em> is an improved version using a Morse
|
<p>Style <em>hbond/dreiding/morse</em> is an improved version using a Morse
|
||||||
potential for the Donor-Acceptor interactions. <a class="reference internal" href="#liu"><span>(Liu)</span></a> showed
|
potential for the Donor-Acceptor interactions. <a class="reference internal" href="#liu"><span>(Liu)</span></a> showed
|
||||||
|
|
File diff suppressed because one or more lines are too long
Loading…
Reference in New Issue