forked from lijiext/lammps
70 lines
1.9 KiB
Plaintext
70 lines
1.9 KiB
Plaintext
.. index:: compute smd/tlsph/shape
|
|
|
|
compute smd/tlsph/shape command
|
|
===============================
|
|
|
|
Syntax
|
|
""""""
|
|
|
|
.. parsed-literal::
|
|
|
|
compute ID group-ID smd/tlsph/shape
|
|
|
|
* ID, group-ID are documented in :doc:`compute <compute>` command
|
|
* smd/tlsph/shape = style name of this compute command
|
|
|
|
Examples
|
|
""""""""
|
|
|
|
.. parsed-literal::
|
|
|
|
compute 1 all smd/tlsph/shape
|
|
|
|
Description
|
|
"""""""""""
|
|
|
|
Define a computation that outputs the current shape of the volume
|
|
associated with a particle as a rotated ellipsoid. It is only
|
|
meaningful for particles which interact according to the
|
|
Total-Lagrangian SPH pair style.
|
|
|
|
See `this PDF guide <USER/smd/SMD_LAMMPS_userguide.pdf>`_ to use Smooth
|
|
Mach Dynamics in LAMMPS.
|
|
|
|
**Output info:**
|
|
|
|
This compute calculates a per-particle vector of vectors, which can be
|
|
accessed by any command that uses per-particle values from a compute
|
|
as input. See :ref:`How-to discussions, section 6.15 <howto_15>` for an overview of LAMMPS output
|
|
options.
|
|
|
|
The per-particle vector has 7 entries. The first three entries
|
|
correspond to the lengths of the ellipsoid's axes and have units of
|
|
length. These axis valus are computed as the contact radius times the
|
|
xx, yy, or zz components of the Green-Lagrange strain tensor
|
|
associated with the particle. The next 4 values are quaternions
|
|
(order: q, x, y, z) which describe the spatial rotation of the
|
|
particle relative to its initial state.
|
|
|
|
Restrictions
|
|
""""""""""""
|
|
|
|
|
|
This compute is part of the USER-SMD package. It is only enabled if
|
|
LAMMPS was built with that package. See the :ref:`Making LAMMPS <start_3>` section for more info.
|
|
|
|
This quantity will be computed only for particles which interact with
|
|
the Total-Lagrangian SPH pair style.
|
|
|
|
Related commands
|
|
""""""""""""""""
|
|
|
|
:doc:`smd/contact/radius <compute_smd_contact_radius>`
|
|
|
|
**Default:** none
|
|
|
|
|
|
.. _lws: http://lammps.sandia.gov
|
|
.. _ld: Manual.html
|
|
.. _lc: Section_commands.html#comm
|