.. index:: compute smd/ulsph/strain

compute smd/ulsph/strain command
================================

Syntax
""""""

.. parsed-literal::

   compute ID group-ID smd/ulsph/strain

* ID, group-ID are documented in :doc:`compute <compute>` command
* smd/ulsph/strain = style name of this compute command

Examples
""""""""

.. parsed-literal::

   compute 1 all smd/ulsph/strain

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

Define a computation that outputs the logarithmic strain tensor.  for
particles interacting via the updated Lagrangian SPH pair style.

See `this PDF guide <USER/smd/SMD_LAMMPS_userguide.pdf>`_ to using Smooth
Mach Dynamics in LAMMPS.

**Output info:**

This compute calculates a per-particle tensor, which can be accessed
by any command that uses per-particle values from a compute as input.
See :ref:`Section_howto 15 <howto_15>` for an overview of
LAMMPS output options.

The per-particle vector has 6 entries, corresponding to the xx, yy,
zz, xy, xz, yz components of the symmetric strain rate tensor.

The per-particle tensor values will be given dimensionless, see
:doc:`units <units>`.

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 compute
can only be used for particles which interact with the updated
Lagrangian SPH pair style.

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

:doc:`compute smd/tlsph/strain <compute_smd_tlsph_strain>`

**Default:** none


.. _lws: http://lammps.sandia.gov
.. _ld: Manual.html
.. _lc: Section_commands.html#comm