fbfd916c69
git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@13836 f3b2605a-c512-4ea7-a41b-209d697bcdaa
58 lines
2.1 KiB
HTML
58 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/tlsph_shape 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_shape
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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_shape = 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_shape
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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 current shape of the volume associated with a particle as a rotated ellipsoid.
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It is only meaningful for particles which interact according to 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 of vectors, which can be
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accessed by 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 has 7 entries. The first three entries correspond to the lengths of the ellipsoid's axes and have units of length.
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These axis valus are computed as the contact radius times the xx, yy, or zz components of the Green-Lagrange strain tensor associated with the particle.
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The next 4 values are quaternions (order: q, x, y, z) which describe the spatial rotation of the particle relative to its initial state.
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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 LAMMPS was
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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 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 = "compute_smd_contact_radius.html">smd/contact_radius</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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