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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/tlsph_dt command
</H3>
<P><B>Syntax:</B>
</P>
<PRE>compute ID group-ID smd/tlsph_dt
</PRE>
<UL><LI>ID, group-ID are documented in <A HREF = "compute.html">compute</A> command
<LI>smd/tlsph_dt = style name of this compute command
</UL>
<P><B>Examples:</B>
</P>
<PRE>compute 1 all smd/tlsph_dt
</PRE>
<P><B>Description:</B>
</P>
<P>Define a computation that outputs the CFL-stable time increment per particle.
This time increment is essentially given by the speed of sound, divided by the SPH smoothing length.
Because both the speed of sound and the smoothing length typically change during the course of a simulation,
the stable time increment needs to be recomputed every time step.
This calculation is performed automatically in the relevant SPH pair styles and this compute only serves to make the
stable time increment accessible for output purposes.
</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, 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 values will be given in <A HREF = "units.html">units</A> of time.
</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.
</P>
<P>This compute can only be used for particles interacting with the Total-Lagrangian SPH pair style.
</P>
<P><B>Related commands:</B>
</P>
<P><A HREF = "fix_smd_adjust_dt.html">smd/adjust_dt</A>
</P>
<P><B>Default:</B> none
</P>
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