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lammps/doc/_sources/compute_smd_ulsph_strain_rate.txt
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compute_smd_ulsph_strain_rate.txt
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.. index:: compute smd/ulsph/strain/rate
compute smd/ulsph/strain/rate command
=====================================
Syntax
""""""
.. parsed-literal::
compute ID group-ID smd/ulsph/strain/rate
* ID, group-ID are documented in :doc:`compute <compute>` command
* smd/ulsph/strain/rate = style name of this compute command
Examples
""""""""
.. parsed-literal::
compute 1 all smd/ulsph/strain/rate
Description
"""""""""""
Define a computation that outputs the rate of 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 vector of vectors (tensors),
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 values will be given in :doc:`units <units>` of one over time.
The per-particle vector has 6 entries, corresponding to the xx, yy,
zz, xy, xz, yz components of the symmetric strain rate tensor.
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_2>` 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/rate <compute_smd_tlsph_strain_rate>`
**Default:** none
.. _lws: http://lammps.sandia.gov
.. _ld: Manual.html
.. _lc: Section_commands.html#comm
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