Homec4science
Diffusion lammps (master) Browse

lammps/doc/_sources/pair_sph_taitwater_morris.txt
9cf43f2a0b7fmaster

Last Change
Raw File

pair_sph_taitwater_morris.txt
View Options

.. index:: pair_style sph/taitwater/morris
pair_style sph/taitwater/morris command
=======================================
Syntax
""""""
.. parsed-literal::
pair_style sph/taitwater/morris
Examples
""""""""
.. parsed-literal::
pair_style sph/taitwater/morris
pair_coeff * * 1000.0 1430.0 1.0 2.4
Description
"""""""""""
The sph/taitwater/morris style computes pressure forces between SPH
particles according to Tait's equation of state:
.. image:: Eqs/pair_sph_tait.jpg
:align: center
where gamma = 7 and B = c_0^2 rho_0 / gamma, with rho_0 being the
reference density and c_0 the reference speed of sound.
This pair style also computes laminar viscosity :ref:`(Morris) <Morris>`.
See `this PDF guide <USER/sph/SPH_LAMMPS_userguide.pdf>`_ to using SPH in
LAMMPS.
The following coefficients must be defined for each pair of atoms
types via the :doc:`pair_coeff <pair_coeff>` command as in the examples
above.
* rho0 reference density (mass/volume units)
* c0 reference soundspeed (distance/time units)
* nu dynamic viscosity (mass*distance/time units)
* h kernel function cutoff (distance units)
----------
**Mixing, shift, table, tail correction, restart, rRESPA info**:
This style does not support mixing. Thus, coefficients for all
I,J pairs must be specified explicitly.
This style does not support the :doc:`pair_modify <pair_modify>`
shift, table, and tail options.
This style does not write information to :doc:`binary restart files <restart>`. Thus, you need to re-specify the pair_style and
pair_coeff commands in an input script that reads a restart file.
This style can only be used via the *pair* keyword of the :doc:`run_style respa <run_style>` command. It does not support the *inner*,
*middle*, *outer* keywords.
Restrictions
""""""""""""
This pair style is part of the USER-SPH package. It is only enabled
if LAMMPS was built with that package. See the :ref:`Making LAMMPS <start_3>` section for more info.
Related commands
""""""""""""""""
:doc:`pair_coeff <pair_coeff>`, pair_sph/rhosum
**Default:** none
----------
.. _Morris:
**(Morris)** Morris, Fox, Zhu, J Comp Physics, 136, 214-226 (1997).
.. _lws: http://lammps.sandia.gov
.. _ld: Manual.html
.. _lc: Section_commands.html#comm
c4science · Help