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<li>bond_style hybrid command</li>
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<div class="section" id="bond-style-hybrid-command">
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<span id="index-0"></span><h1>bond_style hybrid command</h1>
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<div class="section" id="syntax">
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<h2>Syntax</h2>
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<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">bond_style</span> <span class="n">hybrid</span> <span class="n">style1</span> <span class="n">style2</span> <span class="o">...</span>
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</pre></div>
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<ul class="simple">
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<li>style1,style2 = list of one or more bond styles</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</h2>
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<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">bond_style</span> <span class="n">hybrid</span> <span class="n">harmonic</span> <span class="n">fene</span>
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<span class="n">bond_coeff</span> <span class="mi">1</span> <span class="n">harmonic</span> <span class="mf">80.0</span> <span class="mf">1.2</span>
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<span class="n">bond_coeff</span> <span class="mi">2</span><span class="o">*</span> <span class="n">fene</span> <span class="mf">30.0</span> <span class="mf">1.5</span> <span class="mf">1.0</span> <span class="mf">1.0</span>
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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</h2>
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<p>The <em>hybrid</em> style enables the use of multiple bond styles in one
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simulation. A bond style is assigned to each bond type. For example,
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bonds in a polymer flow (of bond type 1) could be computed with a
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<em>fene</em> potential and bonds in the wall boundary (of bond type 2) could
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be computed with a <em>harmonic</em> potential. The assignment of bond type
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to style is made via the <a class="reference internal" href="bond_coeff.html"><span class="doc">bond_coeff</span></a> command or in
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the data file.</p>
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<p>In the bond_coeff commands, the name of a bond style must be added
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after the bond type, with the remaining coefficients being those
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appropriate to that style. In the example above, the 2 bond_coeff
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commands set bonds of bond type 1 to be computed with a <em>harmonic</em>
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potential with coefficients 80.0, 1.2 for K, r0. All other bond types
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(2-N) are computed with a <em>fene</em> potential with coefficients 30.0,
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1.5, 1.0, 1.0 for K, R0, epsilon, sigma.</p>
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<p>If bond coefficients are specified in the data file read via the
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<a class="reference internal" href="read_data.html"><span class="doc">read_data</span></a> command, then the same rule applies.
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E.g. “harmonic” or “fene” must be added after the bond type, for each
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line in the “Bond Coeffs” section, e.g.</p>
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<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">Bond</span> <span class="n">Coeffs</span>
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</pre></div>
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</div>
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<div class="highlight-default"><div class="highlight"><pre><span></span><span class="mi">1</span> <span class="n">harmonic</span> <span class="mf">80.0</span> <span class="mf">1.2</span>
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<span class="mi">2</span> <span class="n">fene</span> <span class="mf">30.0</span> <span class="mf">1.5</span> <span class="mf">1.0</span> <span class="mf">1.0</span>
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<span class="o">...</span>
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</pre></div>
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</div>
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<p>A bond style of <em>none</em> with no additional coefficients can be used in
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place of a bond style, either in a input script bond_coeff command or
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in the data file, if you desire to turn off interactions for specific
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bond types.</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</h2>
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<p>This bond style can only be used if LAMMPS was built with the
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MOLECULE package (which it is by default). 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.</p>
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<p>Unlike other bond styles, the hybrid bond style does not store bond
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coefficient info for individual sub-styles in a <a class="reference internal" href="restart.html"><span class="doc">binary restart files</span></a>. Thus when retarting a simulation from a restart
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file, you need to re-specify bond_coeff commands.</p>
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</div>
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<div class="section" id="related-commands">
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<h2>Related commands</h2>
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<p><a class="reference internal" href="bond_coeff.html"><span class="doc">bond_coeff</span></a>, <a class="reference internal" href="delete_bonds.html"><span class="doc">delete_bonds</span></a></p>
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<p><strong>Default:</strong> none</p>
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