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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>
</CENTER>
<HR>
<H3>compute smd/tlsph_defgrad command
</H3>
<P><B>Syntax:</B>
</P>
<PRE>compute ID group-ID smd/tlsph_defgrad
</PRE>
<UL><LI>ID, group-ID are documented in <A HREF = "compute.html">compute</A> command
<LI>smd/tlsph_defgrad = style name of this compute command
</UL>
<P><B>Examples:</B>
</P>
<PRE>compute 1 all smd/tlsph_defgrad
</PRE>
<P><B>Description:</B>
</P>
<P>Define a computation that calculates the deformation gradient.
It is only meaningful for particles which interact according to the Total-Lagrangian SPH pair style.
</P>
<P>See <A HREF = "USER/smd/SMD_LAMMPS_userguide.pdf">this PDF guide</A> to use Smooth Mach Dynamics in
LAMMPS.
</P>
<P><B>Output info:</B>
</P>
<P>This compute outputss a per-particle vector of vectors (tensors), which can be
accessed by any command that uses per-particle values from a compute as input. See
<A HREF = "Section_howto.html#howto_15">How-to discussions, section 6.15</A>
for an overview of LAMMPS output options.
</P>
<P>The per-particle vector values will be given dimensionless. See <A HREF = "units.html">units</A>.
The per-particle vector has 10 entries. The first nine entries correspond to the xx, xy, xz, yx, yy, yz, zx, zy, zz components
of the asymmetric deformation gradient tensor. The tenth entry is the determinant of the deformation gradient.
</P>
<P><B>Restrictions:</B>
</P>
<P>This compute is part of the USER-SMD package. It is only enabled if LAMMPS was
built with that package. See the <A HREF = "Section_start.html#start_3">Making LAMMPS</A>
section for more info. TThis compute can only be used for particles which interact via the
total Lagrangian SPH pair style.
</P>
<P><B>Related commands:</B>
</P>
<P><A HREF = "compute_smd_hourglass_error.html">smd/hourglass_error</A>
</P>
<P><B>Default:</B> none
</P>
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