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git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@13836 f3b2605a-c512-4ea7-a41b-209d697bcdaa
61 lines
1.8 KiB
HTML
61 lines
1.8 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>pair_style smd/hertz command
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</H3>
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<P><B>Syntax:</B>
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</P>
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<PRE>pair_style smd/hertz scale_factor
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</PRE>
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<P><B>Examples:</B>
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</P>
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<P>pair_style smd/hertz 1.0
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pair_coeff 1 1 <contact_stiffness>
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</P>
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<P><B>Description:</B>
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</P>
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<P>The <I>smd/hertz</I> style calculates contact forces between SPH particles belonging to different physical bodies.
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</P>
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<P>The contact forces are calculated using a Hertz potential, which evaluates the overlap between two particles
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(whose spatial extents are defined via its contact radius).
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The effect is that a particles cannot penetrate into each other.
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The parameter <contact_stiffness> has units of pressure and should equal roughly one half
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of the Young's modulus (or bulk modulus in the case of fluids) of the material model associated with the SPH particles.
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</P>
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<P>The parameter <I>scale_factor</I> can be used to scale the particles' contact radii. This can be useful to control how close
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particles can approach each other. Usually, <I>scale_factor</I>=1.0.
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</P>
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<HR>
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<P><B>Mixing, shift, table, tail correction, restart, rRESPA info</B>:
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</P>
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<P>No mixing is performed automatically.
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Currently, no part of USER-SMD supports restarting nor minimization.
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rRESPA does not apply to this pair style.
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</P>
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<HR>
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<P><B>Restrictions:</B>
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</P>
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<P>This fix 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><B>Related commands:</B>
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</P>
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<P><A HREF = "pair_coeff.html">pair_coeff</A>
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</P>
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<P><B>Default:</B> none
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</P>
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<HR>
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</HTML>
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