fbfd916c69
git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@13836 f3b2605a-c512-4ea7-a41b-209d697bcdaa
62 lines
2.1 KiB
HTML
62 lines
2.1 KiB
HTML
<HTML>
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<CENTER><A HREF = "http://lammps.sandia.gov">LAMMPS WWW Site</A> - <A HREF = "Manual.html">LAMMPS Documentation</A> - <A HREF = "Section_commands.html#comm">LAMMPS Commands</A>
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</CENTER>
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<HR>
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<H3>compute smd/hourglass_error command
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</H3>
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<P><B>Syntax:</B>
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</P>
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<PRE>compute ID group-ID smd/hourglass_error
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</PRE>
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<UL><LI>ID, group-ID are documented in <A HREF = "compute.html">compute</A> command
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<LI>smd/hourglass_error = style name of this compute command
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</UL>
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<P><B>Examples:</B>
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</P>
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<PRE>compute 1 all smd/hourglass_error
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</PRE>
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<P><B>Description:</B>
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</P>
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<P>Define a computation which outputs the error of the approximated
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relative separation with respect to the actual relative separation of
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the particles i and j. Ideally, if the deformation gradient is exact,
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and there exists a unique mapping between all particles' positions
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within the neighborhood of the central node and the deformation gradient,
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the approximated relative separation will coincide with the actual relative
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separation of the particles i and j in the deformed configuration.
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This compute is only really useful for debugging the hourglass control mechanim which is part of the Total-Lagrangian SPH pair style.
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</P>
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<P>See <A HREF = "USER/smd/SMD_LAMMPS_userguide.pdf">this PDF guide</A> to use Smooth Mach Dynamics in LAMMPS.
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</P>
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<P><B>Output Info:</B>
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</P>
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<P>This compute calculates a per-particle vector, which can be accessed by
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any command that uses per-particle values from a compute as input. See
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<A HREF = "Section_howto.html#howto_15">How-to discussions, section 6.15</A>
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for an overview of LAMMPS output options.
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</P>
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<P>The per-particle vector values will are dimensionless. See <A HREF = "units.html">units</A>.
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</P>
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<P><B>Restrictions:</B>
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</P>
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<P>This compute is part of the USER-SMD package. It is only enabled if
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LAMMPS was built with that package. See the <A HREF = "Section_start.html#start_3">Making LAMMPS</A>
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section for more info.
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</P>
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<P>This quantity will be computed only for particles which interact with tlsph pair style.
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</P>
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<P><B>Related Commands:</B>
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</P>
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<P><A HREF = "compute_smd_tlsph_defgrad.html">smd/tlsph_defgrad</A>
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</P>
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<P><B>Default:</B>
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</P>
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</HTML>
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