63 lines
1.5 KiB
ReStructuredText
63 lines
1.5 KiB
ReStructuredText
.. index:: compute smd/contact/radius
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compute smd/contact/radius 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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compute ID group-ID smd/contact/radius
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* ID, group-ID are documented in :doc:`compute <compute>` command
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* smd/contact/radius = style name of this compute command
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Examples
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""""""""
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.. code-block:: LAMMPS
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compute 1 all smd/contact/radius
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Description
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"""""""""""
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Define a computation which outputs the contact radius, i.e., the
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radius used to prevent particles from penetrating each other. The
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contact radius is used only to prevent particles belonging to
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different physical bodies from penetrating each other. It is used by
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the contact pair styles, e.g., smd/hertz and smd/tri_surface.
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See `this PDF guide <PDF/MACHDYN_LAMMPS_userguide.pdf>`_ to using Smooth
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Mach Dynamics in LAMMPS.
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The value of the contact radius will be 0.0 for particles not in the
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specified compute group.
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Output info
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"""""""""""
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This compute calculates a per-particle vector, which can be accessed
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by any command that uses per-particle values from a compute as input.
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See the :doc:`Howto output <Howto_output>` page for an overview of
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LAMMPS output options.
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The per-particle vector values will be in distance :doc:`units <units>`.
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Restrictions
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""""""""""""
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This compute is part of the MACHDYN package. It is only enabled if
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LAMMPS was built with that package. See the :doc:`Build package <Build_package>` page for more info.
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Related commands
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""""""""""""""""
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:doc:`dump custom <dump>` smd/hertz smd/tri_surface
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Default
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"""""""
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none
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