59 lines
1.6 KiB
ReStructuredText
59 lines
1.6 KiB
ReStructuredText
.. index:: fix sph/stationary
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fix sph/stationary command
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==========================
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Syntax
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""""""
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.. parsed-literal::
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fix ID group-ID sph/stationary
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* ID, group-ID are documented in :doc:`fix <fix>` command
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* sph = style name of this fix command
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Examples
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""""""""
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.. code-block:: LAMMPS
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fix 1 boundary sph/stationary
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Description
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"""""""""""
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Perform time integration to update internal energy and local density,
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but not position or velocity for atoms in the group each timestep.
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This fix is needed for SPH simulations to correctly time-integrate
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fixed boundary particles which constrain a fluid to a given region in
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space. SPH stands for Smoothed Particle Hydrodynamics.
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See `this PDF guide <PDF/SPH_LAMMPS_userguide.pdf>`_ to using SPH in
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LAMMPS.
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Restart, fix_modify, output, run start/stop, minimize info
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"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
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No information about this fix is written to :doc:`binary restart files <restart>`. None of the :doc:`fix_modify <fix_modify>` options
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are relevant to this fix. No global or per-atom quantities are stored
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by this fix for access by various :doc:`output commands <Howto_output>`.
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No parameter of this fix can be used with the *start/stop* keywords of
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the :doc:`run <run>` command. This fix is not invoked during :doc:`energy minimization <minimize>`.
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Restrictions
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""""""""""""
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This fix is part of the SPH 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:`fix sph <fix_sph>`
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Default
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"""""""
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none
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