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