forked from lijiext/lammps
450 lines
26 KiB
HTML
450 lines
26 KiB
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<li class="toctree-l2"><a class="reference internal" href="compute_modify.html">compute_modify command</a></li>
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<li>dihedral_style command</li>
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<div class="section" id="dihedral-style-command">
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<span id="index-0"></span><h1>dihedral_style command</h1>
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<div class="section" id="syntax">
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<h2>Syntax</h2>
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<pre class="literal-block">
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dihedral_style style
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</pre>
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<ul class="simple">
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<li>style = <em>none</em> or <em>hybrid</em> or <em>charmm</em> or <em>class2</em> or <em>harmonic</em> or <em>helix</em> or <em>multi/harmonic</em> or <em>opls</em></li>
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<div class="section" id="examples">
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<h2>Examples</h2>
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<pre class="literal-block">
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dihedral_style harmonic
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dihedral_style multi/harmonic
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dihedral_style hybrid harmonic charmm
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</pre>
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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>Set the formula(s) LAMMPS uses to compute dihedral interactions
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between quadruplets of atoms, which remain in force for the duration
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of the simulation. The list of dihedral quadruplets is read in by a
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<a class="reference internal" href="read_data.html"><span class="doc">read_data</span></a> or <a class="reference internal" href="read_restart.html"><span class="doc">read_restart</span></a> command
|
|
from a data or restart file.</p>
|
|
<p>Hybrid models where dihedrals are computed using different dihedral
|
|
potentials can be setup using the <em>hybrid</em> dihedral style.</p>
|
|
<p>The coefficients associated with a dihedral style can be specified in
|
|
a data or restart file or via the <a class="reference internal" href="dihedral_coeff.html"><span class="doc">dihedral_coeff</span></a>
|
|
command.</p>
|
|
<p>All dihedral potentials store their coefficient data in binary restart
|
|
files which means dihedral_style and
|
|
<a class="reference internal" href="dihedral_coeff.html"><span class="doc">dihedral_coeff</span></a> commands do not need to be
|
|
re-specified in an input script that restarts a simulation. See the
|
|
<a class="reference internal" href="read_restart.html"><span class="doc">read_restart</span></a> command for details on how to do
|
|
this. The one exception is that dihedral_style <em>hybrid</em> only stores
|
|
the list of sub-styles in the restart file; dihedral coefficients need
|
|
to be re-specified.</p>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">When both a dihedral and pair style is defined, the
|
|
<a class="reference internal" href="special_bonds.html"><span class="doc">special_bonds</span></a> command often needs to be used to
|
|
turn off (or weight) the pairwise interaction that would otherwise
|
|
exist between 4 bonded atoms.</p>
|
|
</div>
|
|
<p>In the formulas listed for each dihedral style, <em>phi</em> is the torsional
|
|
angle defined by the quadruplet of atoms. This angle has a sign
|
|
convention as shown in this diagram:</p>
|
|
<img alt="_images/dihedral_sign.jpg" class="align-center" src="_images/dihedral_sign.jpg" />
|
|
<p>where the I,J,K,L ordering of the 4 atoms that define the dihedral
|
|
is from left to right.</p>
|
|
<p>This sign convention effects several of the dihedral styles listed
|
|
below (e.g. charmm, helix) in the sense that the energy formula
|
|
depends on the sign of phi, which may be reflected in the value of the
|
|
coefficients you specify.</p>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">When comparing the formulas and coefficients for various LAMMPS
|
|
dihedral styles with dihedral equations defined by other force fields,
|
|
note that some force field implementations divide/multiply the energy
|
|
prefactor <em>K</em> by the multiple number of torsions that contain the J-K
|
|
bond in an I-J-K-L torsion. LAMMPS does not do this, i.e. the listed
|
|
dihedral equation applies to each individual dihedral. Thus you need
|
|
to define <em>K</em> appropriately via the
|
|
<a class="reference internal" href="dihedral_coeff.html"><span class="doc">dihedral_coeff</span></a> command to account for this
|
|
difference if necessary.</p>
|
|
</div>
|
|
<hr class="docutils" />
|
|
<p>Here is an alphabetic list of dihedral styles defined in LAMMPS. Click on
|
|
the style to display the formula it computes and coefficients
|
|
specified by the associated <a class="reference internal" href="dihedral_coeff.html"><span class="doc">dihedral_coeff</span></a> command.</p>
|
|
<p>Note that there are also additional dihedral styles submitted by users
|
|
which are included in the LAMMPS distribution. The list of these with
|
|
links to the individual styles are given in the dihedral section of
|
|
<a class="reference internal" href="Section_commands.html#cmd-5"><span class="std std-ref">this page</span></a>.</p>
|
|
<ul class="simple">
|
|
<li><a class="reference internal" href="dihedral_none.html"><span class="doc">dihedral_style none</span></a> - turn off dihedral interactions</li>
|
|
<li><a class="reference internal" href="dihedral_zero.html"><span class="doc">dihedral_style zero</span></a> - topology but no interactions</li>
|
|
<li><a class="reference internal" href="dihedral_hybrid.html"><span class="doc">dihedral_style hybrid</span></a> - define multiple styles of dihedral interactions</li>
|
|
<li><a class="reference internal" href="dihedral_charmm.html"><span class="doc">dihedral_style charmm</span></a> - CHARMM dihedral</li>
|
|
<li><a class="reference internal" href="dihedral_class2.html"><span class="doc">dihedral_style class2</span></a> - COMPASS (class 2) dihedral</li>
|
|
<li><a class="reference internal" href="dihedral_harmonic.html"><span class="doc">dihedral_style harmonic</span></a> - harmonic dihedral</li>
|
|
<li><a class="reference internal" href="dihedral_helix.html"><span class="doc">dihedral_style helix</span></a> - helix dihedral</li>
|
|
<li><a class="reference internal" href="dihedral_multi_harmonic.html"><span class="doc">dihedral_style multi/harmonic</span></a> - multi-harmonic dihedral</li>
|
|
<li><a class="reference internal" href="dihedral_opls.html"><span class="doc">dihedral_style opls</span></a> - OPLS dihedral</li>
|
|
</ul>
|
|
</div>
|
|
<hr class="docutils" />
|
|
<div class="section" id="restrictions">
|
|
<h2>Restrictions</h2>
|
|
<p>Dihedral styles can only be set for atom styles that allow dihedrals
|
|
to be defined.</p>
|
|
<p>Most dihedral styles are part of the MOLECULE package. They are only
|
|
enabled if 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 on packages.
|
|
The doc pages for individual dihedral potentials tell if it is part of
|
|
a package.</p>
|
|
</div>
|
|
<div class="section" id="related-commands">
|
|
<h2>Related commands</h2>
|
|
<p><a class="reference internal" href="dihedral_coeff.html"><span class="doc">dihedral_coeff</span></a></p>
|
|
</div>
|
|
<div class="section" id="default">
|
|
<h2>Default</h2>
|
|
<p>dihedral_style none</p>
|
|
</div>
|
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</div>
|
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<a href="dimension.html" class="btn btn-neutral float-right" title="dimension command" accesskey="n">Next <span class="fa fa-arrow-circle-right"></span></a>
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<a href="dihedral_coeff.html" class="btn btn-neutral" title="dihedral_coeff command" accesskey="p"><span class="fa fa-arrow-circle-left"></span> Previous</a>
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