git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@14950 f3b2605a-c512-4ea7-a41b-209d697bcdaa

doc/html/_sources/compute_smd_hourglass_error.txt

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+.. index:: compute smd/hourglass/error
+
+compute smd/hourglass/error command
+===================================
+
+Syntax
+""""""
+
+.. parsed-literal::
+
+   compute ID group-ID smd/hourglass/error
+
+* ID, group-ID are documented in :doc:`compute <compute>` command
+* smd/hourglass/error = style name of this compute command
+
+Examples
+""""""""
+
+.. parsed-literal::
+
+   compute 1 all smd/hourglass/error
+
+Description
+"""""""""""
+
+Define a computation which outputs the error of the approximated
+relative separation with respect to the actual relative separation of
+the particles i and j. Ideally, if the deformation gradient is exact,
+and there exists a unique mapping between all particles' positions
+within the neighborhood of the central node and the deformation
+gradient, the approximated relative separation will coincide with the
+actual relative separation of the particles i and j in the deformed
+configuration.  This compute is only really useful for debugging the
+hourglass control mechanim which is part of the Total-Lagrangian SPH
+pair style.
+
+See `this PDF guide <USER/smd/SMD_LAMMPS_userguide.pdf>`_ to use Smooth
+Mach Dynamics in LAMMPS.
+
+**Output Info:**
+
+This compute calculates a per-particle vector, which can be accessed by
+any command that uses per-particle values from a compute as input.  See
+:ref:`How-to discussions, section 6.15 <howto_15>`
+for an overview of LAMMPS output options.
+
+The per-particle vector values will are 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 quantity will be computed only for particles which interact with
+tlsph pair style.
+
+**Related Commands:**
+
+:doc:`smd/tlsph_defgrad <compute_smd_tlsph_defgrad>`
+
+Default
+"""""""
+
+
+.. _lws: http://lammps.sandia.gov
+.. _ld: Manual.html
+.. _lc: Section_commands.html#comm