forked from lijiext/lammps
70 lines
1.6 KiB
Plaintext
70 lines
1.6 KiB
Plaintext
.. index:: pair_style smd/hertz
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pair_style smd/hertz command
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============================
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Syntax
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""""""
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.. parsed-literal::
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pair_style smd/hertz scale_factor
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Examples
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""""""""
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pair_style smd/hertz 1.0
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pair_coeff 1 1 <contact_stiffness>
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Description
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"""""""""""
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The *smd/hertz* style calculates contact forces between SPH particles belonging to different physical bodies.
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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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The parameter *scale_factor* 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, *scale_factor*\ =1.0.
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----------
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**Mixing, shift, table, tail correction, restart, rRESPA info**\ :
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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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----------
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Restrictions
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""""""""""""
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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 :ref:`Making LAMMPS <start_3>`
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section for more info.
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Related commands
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""""""""""""""""
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:doc:`pair_coeff <pair_coeff>`
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**Default:** none
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----------
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.. _lws: http://lammps.sandia.gov
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.. _ld: Manual.html
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.. _lc: Section_commands.html#comm
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