git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@14950 f3b2605a-c512-4ea7-a41b-209d697bcdaa

doc/html/_sources/compute_erotate_asphere.txt

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+.. index:: compute erotate/asphere
+
+compute erotate/asphere command
+===============================
+
+Syntax
+""""""
+
+.. parsed-literal::
+
+   compute ID group-ID erotate/asphere
+
+* ID, group-ID are documented in :doc:`compute <compute>` command
+* erotate/asphere = style name of this compute command
+
+Examples
+""""""""
+
+.. parsed-literal::
+
+   compute 1 all erotate/asphere
+
+Description
+"""""""""""
+
+Define a computation that calculates the rotational kinetic energy of
+a group of aspherical particles.  The aspherical particles can be
+ellipsoids, or line segments, or triangles.  See the
+:doc:`atom_style <atom_style>` and :doc:`read_data <read_data>` commands
+for descriptions of these options.
+
+For all 3 types of particles, the rotational kinetic energy is
+computed as 1/2 I w^2, where I is the inertia tensor for the
+aspherical particle and w is its angular velocity, which is computed
+from its angular momentum if needed.
+
+.. note::
+
+   For :doc:`2d models <dimension>`, ellipsoidal particles are
+   treated as ellipsoids, not ellipses, meaning their moments of inertia
+   will be the same as in 3d.
+
+**Output info:**
+
+This compute calculates a global scalar (the KE).  This value can be
+used by any command that uses a global scalar value from a compute as
+input.  See :ref:`Section_howto 15 <howto_15>` for an
+overview of LAMMPS output options.
+
+The scalar value calculated by this compute is "extensive".  The
+scalar value will be in energy :doc:`units <units>`.
+
+Restrictions
+""""""""""""
+
+
+This compute requires that ellipsoidal particles atoms store a shape
+and quaternion orientation and angular momentum as defined by the
+:doc:`atom_style ellipsoid <atom_style>` command.
+
+This compute requires that line segment particles atoms store a length
+and orientation and angular velocity as defined by the :doc:`atom_style line <atom_style>` command.
+
+This compute requires that triangular particles atoms store a size and
+shape and quaternion orientation and angular momentum as defined by
+the :doc:`atom_style tri <atom_style>` command.
+
+All particles in the group must be finite-size.  They cannot be point
+particles.
+
+**Related commands:** none
+
+:doc:`compute erotate/sphere <compute_erotate_sphere>`
+
+**Default:** none
+
+
+.. _lws: http://lammps.sandia.gov
+.. _ld: Manual.html
+.. _lc: Section_commands.html#comm