1.. index:: compute smd/ulsph/strain
2
3compute smd/ulsph/strain command
4================================
5
6Syntax
7""""""
8
9.. code-block:: LAMMPS
10
11   compute ID group-ID smd/ulsph/strain
12
13* ID, group-ID are documented in :doc:`compute <compute>` command
14* smd/ulsph/strain = style name of this compute command
15
16Examples
17""""""""
18
19.. code-block:: LAMMPS
20
21   compute 1 all smd/ulsph/strain
22
23Description
24"""""""""""
25
26Define a computation that outputs the logarithmic strain tensor.  for
27particles interacting via the updated Lagrangian SPH pair style.
28
29See `this PDF guide <PDF/SMD_LAMMPS_userguide.pdf>`_ to using Smooth
30Mach Dynamics in LAMMPS.
31
32Output info
33"""""""""""
34
35This compute calculates a per-particle tensor, which can be accessed
36by any command that uses per-particle values from a compute as input.
37See the :doc:`Howto output <Howto_output>` page for an overview of
38LAMMPS output options.
39
40The per-particle vector has 6 entries, corresponding to the xx, yy,
41zz, xy, xz, yz components of the symmetric strain rate tensor.
42
43The per-particle tensor values will be given dimensionless, see
44:doc:`units <units>`.
45
46Restrictions
47""""""""""""
48
49This compute is part of the MACHDYN package.  It is only enabled if
50LAMMPS was built with that package. See the :doc:`Build package <Build_package>` page for more info. This compute can
51only be used for particles which interact with the updated Lagrangian
52SPH pair style.
53
54Related commands
55""""""""""""""""
56
57:doc:`compute smd/tlsph/strain <compute_smd_tlsph_strain>`
58
59Default
60"""""""
61
62none
63