Homec4science
Diffusion lammps (master) Browse

lammps/doc/_sources/compute_ke_rigid.txt
9cf43f2a0b7fmaster

Last Change
Raw File

compute_ke_rigid.txt
View Options

.. index:: compute ke/rigid
compute ke/rigid command
========================
Syntax
""""""
.. parsed-literal::
compute ID group-ID ke/rigid fix-ID
* ID, group-ID are documented in :doc:`compute <compute>` command
* ke = style name of this compute command
* fix-ID = ID of rigid body fix
Examples
""""""""
.. parsed-literal::
compute 1 all ke/rigid myRigid
Description
"""""""""""
Define a computation that calculates the translational kinetic energy
of a collection of rigid bodies, as defined by one of the :doc:`fix rigid <fix_rigid>` command variants.
The kinetic energy of each rigid body is computed as 1/2 M Vcm^2,
where M is the total mass of the rigid body, and Vcm is its
center-of-mass velocity.
The *fix-ID* should be the ID of one of the :doc:`fix rigid <fix_rigid>`
commands which defines the rigid bodies. The group specified in the
compute command is ignored. The kinetic energy of all the rigid
bodies defined by the fix rigid command in included in the
calculation.
**Output info:**
This compute calculates a global scalar (the summed KE of all the
rigid bodies). 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 is part of the RIGID package. It is only enabled if
LAMMPS was built with that package. See the :ref:`Making LAMMPS <start_3>` section for more info.
Related commands
""""""""""""""""
:doc:`compute erotate/rigid <compute_erotate_rigid>`
**Default:** none
.. _lws: http://lammps.sandia.gov
.. _ld: Manual.html
.. _lc: Section_commands.html#comm
c4science · Help