forked from lijiext/lammps
73 lines
2.2 KiB
Plaintext
73 lines
2.2 KiB
Plaintext
.. index:: fix nve/asphere/noforce
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fix nve/asphere/noforce 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 nve/asphere/noforce
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* ID, group-ID are documented in :doc:`fix <fix>` command
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* nve/asphere/noforce = style name of this fix command
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Examples
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""""""""
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fix 1 all nve/asphere/noforce
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Description
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"""""""""""
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Perform updates of position and orientation, but not velocity or
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angular momentum for atoms in the group each timestep. In other
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words, the force and torque on the atoms is ignored and their velocity
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and angular momentum are not updated. The atom velocities and
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angularm momenta are used to update their positions and orientation.
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This is useful as an implicit time integrator for Fast Lubrication
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Dynamics, since the velocity and angular momentum are updated by the
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`pair_style lubricuteU <pair_lubricateU.txt>`_ command.
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----------
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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 :ref:`output commands <howto_15>`. No parameter of this fix can
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be used with the *start/stop* keywords of the :doc:`run <run>` command.
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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 ASPHERE package. It is only enabled if LAMMPS
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was built with that package. See the :ref:`Making LAMMPS <start_3>` section for more info.
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This fix requires that atoms store torque and angular momementum and a
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quaternion as defined by the :doc:`atom_style ellipsoid <atom_style>`
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command.
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All particles in the group must be finite-size. They cannot be point
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particles, but they can be aspherical or spherical as defined by their
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shape attribute.
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Related commands
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""""""""""""""""
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:doc:`fix nve/noforce <fix_nve_noforce>`, :doc:`fix nve/asphere <fix_nve_asphere>`
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**Default:** none
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.. _lws: http://lammps.sandia.gov
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.. _ld: Manual.html
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.. _lc: Section_commands.html#comm
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