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