.. index:: fix nve/asphere

fix nve/asphere command
=======================

Syntax
""""""

.. parsed-literal::

   fix ID group-ID nve/asphere

* ID, group-ID are documented in :doc:`fix <fix>` command
* nve/asphere = style name of this fix command

Examples
""""""""

.. parsed-literal::

   fix 1 all nve/asphere

Description
"""""""""""

Perform constant NVE integration to update position, velocity,
orientation, and angular velocity for aspherical particles in the
group each timestep.  V is volume; E is energy.  This creates a system
trajectory consistent with the microcanonical ensemble.

This fix differs from the :doc:`fix nve <fix_nve>` command, which
assumes point particles and only updates their position and velocity.

Restart, fix_modify, output, run start/stop, minimize info
""""""""""""""""""""""""""""""""""""""""""""""""""""""""""

No information about this fix is written to :doc:`binary restart files <restart>`.  None of the :doc:`fix_modify <fix_modify>` options
are relevant to this fix.  No global or per-atom quantities are stored
by this fix for access by various :ref:`output commands <howto_8>`.  No parameter of this fix can
be used with the *start/stop* keywords of the :doc:`run <run>` command.
This fix is not invoked during :doc:`energy minimization <minimize>`.

Restrictions
""""""""""""


This fix requires that atoms store torque and angular momementum and a
quaternion as defined by the :doc:`atom_style ellipsoid <atom_style>`
command.

All particles in the group must be finite-size.  They cannot be point
particles, but they can be aspherical or spherical as defined by their
shape attribute.

Related commands
""""""""""""""""

:doc:`fix nve <fix_nve>`, :doc:`fix nve/sphere <fix_nve_sphere>`

**Default:** none


.. _liws: http://www.cfdem.com
.. _ld: Manual.html
.. _lc: Section_commands.html#comm