60 lines
1.3 KiB
ReStructuredText
60 lines
1.3 KiB
ReStructuredText
.. index:: bond_style zero
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bond_style zero command
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=======================
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Syntax
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""""""
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.. code-block:: LAMMPS
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bond_style zero keyword
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* zero or more keywords may be appended
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* keyword = *nocoeff*
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Examples
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""""""""
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.. code-block:: LAMMPS
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bond_style zero
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bond_style zero nocoeff
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bond_coeff *
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bond_coeff * 2.14
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Description
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"""""""""""
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Using an bond style of zero means bond forces and energies are not
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computed, but the geometry of bond pairs is still accessible to other
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commands.
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As an example, the :doc:`compute bond/local <compute_bond_local>`
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command can be used to compute distances for the list of pairs of bond
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atoms listed in the data file read by the :doc:`read_data <read_data>`
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command. If no bond style is defined, this command cannot be used.
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The optional *nocoeff* flag allows to read data files with a BondCoeff
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section for any bond style. Similarly, any bond_coeff commands
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will only be checked for the bond type number and the rest ignored.
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Note that the :doc:`bond_coeff <bond_coeff>` command must be used for
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all bond types. If specified, there can be only one value, which is
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going to be used to assign an equilibrium distance, e.g. for use with
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:doc:`fix shake <fix_shake>`.
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Restrictions
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""""""""""""
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none
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Related commands
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""""""""""""""""
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:doc:`bond_style none <bond_none>`
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Default
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"""""""
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none
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