fbfd916c69
git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@13836 f3b2605a-c512-4ea7-a41b-209d697bcdaa
60 lines
2.0 KiB
HTML
60 lines
2.0 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/tlsph_dt 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/tlsph_dt
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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/tlsph_dt = 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/tlsph_dt
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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 that outputs the CFL-stable time increment per particle.
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This time increment is essentially given by the speed of sound, divided by the SPH smoothing length.
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Because both the speed of sound and the smoothing length typically change during the course of a simulation,
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the stable time increment needs to be recomputed every time step.
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This calculation is performed automatically in the relevant SPH pair styles and this compute only serves to make the
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stable time increment accessible for output purposes.
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</P>
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<P>See <A HREF = "USER/smd/SMD_LAMMPS_userguide.pdf">this PDF guide</A> to using 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 values will be given in <A HREF = "units.html">units</A> of time.
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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 compute can only be used for particles interacting with the Total-Lagrangian SPH 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 = "fix_smd_adjust_dt.html">smd/adjust_dt</A>
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</P>
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<P><B>Default:</B> none
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</P>
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</HTML>
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