1.. index:: compute smd/ulsph/strain/rate
2
3compute smd/ulsph/strain/rate command
4=====================================
5
6Syntax
7""""""
8
9.. code-block:: LAMMPS
10
11   compute ID group-ID smd/ulsph/strain/rate
12
13* ID, group-ID are documented in :doc:`compute <compute>` command
14* smd/ulsph/strain/rate = style name of this compute command
15
16Examples
17""""""""
18
19.. code-block:: LAMMPS
20
21   compute 1 all smd/ulsph/strain/rate
22
23Description
24"""""""""""
25
26Define a computation that outputs the rate of the logarithmic strain
27tensor for particles interacting via the updated Lagrangian SPH pair
28style.
29
30See `this PDF guide <PDF/SMD_LAMMPS_userguide.pdf>`_ to using Smooth
31Mach Dynamics in LAMMPS.
32
33Output info
34"""""""""""
35
36This compute calculates a per-particle vector of vectors (tensors),
37which can be accessed by any command that uses per-particle values
38from a compute as input. See the :doc:`Howto output <Howto_output>` doc
39page for an overview of LAMMPS output options.
40
41The values will be given in :doc:`units <units>` of one over time.
42
43The per-particle vector has 6 entries, corresponding to the xx, yy,
44zz, xy, xz, yz components of the symmetric strain rate tensor.
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.
51
52This compute can only be used for particles which interact with the
53updated Lagrangian SPH pair style.
54
55Related commands
56""""""""""""""""
57
58:doc:`compute smd/tlsph/strain/rate <compute_smd_tlsph_strain_rate>`
59
60Default
61"""""""
62
63none
64