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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>
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<H3>compute smd/ulsph_strain_rate command
</H3>
<P><B>Syntax:</B>
</P>
<PRE>compute ID group-ID smd/ulsph_strain_rate
</PRE>
<UL><LI>ID, group-ID are documented in <A HREF = "compute.html">compute</A> command
<LI>smd/ulsph_strain_rate = style name of this compute command
</UL>
<P><B>Examples:</B>
</P>
<PRE>compute 1 all smd/ulsph_strain_rate
</PRE>
<P><B>Description:</B>
</P>
<P>Define a computation that outputs the rate of the logarithmic strain tensor
for particles interacting via the updated Lagrangian SPH pair style.
</P>
<P>See <A HREF = "USER/smd/SMD_LAMMPS_userguide.pdf">this PDF guide</A> to using Smooth Mach Dynamics in LAMMPS.
</P>
<P><B>Output info:</B>
</P>
<P>This compute calculates 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">Section_howto 15</A> for an overview of
LAMMPS output options.
</P>
<P>The values will be given in <A HREF = "units.html">units</A> of one over time.
</P>
<P>The per-particle vector has 6 entries, corresponding to the xx, yy, zz, xy, xz, yz components
of the symmetric strain rate tensor.
</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_2">Making LAMMPS</A>
section for more info. This compute can only be used for particles which interact with the updated Lagrangian SPH pair style.
</P>
<P><B>Related commands:</B>
</P>
<P>smd/utsph_strain_rate
</P>
<P><B>Default:</B> none
</P>
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