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< title > pair_style sph/taitwater command — LAMMPS documentation< / title >
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< li class = "toctree-l1" > < a class = "reference internal" href = "Section_intro.html" > 1. Introduction< / a > < / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "Section_start.html" > 2. Getting Started< / a > < / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "Section_commands.html" > 3. Commands< / a > < / li >
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< li class = "toctree-l1" > < a class = "reference internal" href = "Section_accelerate.html" > 5. Accelerating LAMMPS performance< / a > < / li >
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< li class = "toctree-l1" > < a class = "reference internal" href = "Section_modify.html" > 10. Modifying & extending LAMMPS< / a > < / li >
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< li > pair_style sph/taitwater command< / li >
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< a href = "Section_commands.html#comm" > Commands< / a >
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< span id = "index-0" > < / span > < h1 > pair_style sph/taitwater command< a class = "headerlink" href = "#pair-style-sph-taitwater-command" title = "Permalink to this headline" > ¶< / a > < / h1 >
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< h2 > Syntax< a class = "headerlink" href = "#syntax" title = "Permalink to this headline" > ¶< / a > < / h2 >
< div class = "highlight-python" > < div class = "highlight" > < pre > pair_style sph/taitwater
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< h2 > Examples< a class = "headerlink" href = "#examples" title = "Permalink to this headline" > ¶< / a > < / h2 >
< div class = "highlight-python" > < div class = "highlight" > < pre > pair_style sph/taitwater
pair_coeff * * 1000.0 1430.0 1.0 2.4
< / pre > < / div >
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< h2 > Description< a class = "headerlink" href = "#description" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > The sph/taitwater style computes pressure forces between SPH particles
according to Tait’ s equation of state:< / p >
< img alt = "_images/pair_sph_tait.jpg" class = "align-center" src = "_images/pair_sph_tait.jpg" / >
< p > 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.< / p >
< p > This pair style also computes Monaghan’ s artificial viscosity to
prevent particles from interpentrating < span class = "xref std std-ref" > (Monaghan)< / span > .< / p >
< p > See < a class = "reference external" href = "USER/sph/SPH_LAMMPS_userguide.pdf" > this PDF guide< / a > to using SPH in
LAMMPS.< / p >
< p > The following coefficients must be defined for each pair of atoms
types via the < a class = "reference internal" href = "pair_coeff.html" > < em > pair_coeff< / em > < / a > command as in the examples
above.< / p >
< ul class = "simple" >
< li > rho0 reference density (mass/volume units)< / li >
< li > c0 reference soundspeed (distance/time units)< / li >
< li > nu artificial viscosity (no units)< / li >
< li > h kernel function cutoff (distance units)< / li >
< / ul >
< hr class = "docutils" / >
< p > < strong > Mixing, shift, table, tail correction, restart, rRESPA info< / strong > :< / p >
< p > This style does not support mixing. Thus, coefficients for all
I,J pairs must be specified explicitly.< / p >
< p > This style does not support the < a class = "reference internal" href = "pair_modify.html" > < em > pair_modify< / em > < / a >
shift, table, and tail options.< / p >
< p > This style does not write information to < a class = "reference internal" href = "restart.html" > < em > binary restart files< / em > < / a > . Thus, you need to re-specify the pair_style and
pair_coeff commands in an input script that reads a restart file.< / p >
< p > This style can only be used via the < em > pair< / em > keyword of the < a class = "reference internal" href = "run_style.html" > < em > run_style respa< / em > < / a > command. It does not support the < em > inner< / em > ,
< em > middle< / em > , < em > outer< / em > keywords.< / p >
< / div >
< div class = "section" id = "restrictions" >
< h2 > Restrictions< a class = "headerlink" href = "#restrictions" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > This pair style is part of the USER-SPH package. It is only enabled
if LAMMPS was built with that package. See the < a class = "reference internal" href = "Section_start.html#start-3" > < span > Making LAMMPS< / span > < / a > section for more info.< / p >
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< div class = "section" id = "related-commands" >
< h2 > Related commands< a class = "headerlink" href = "#related-commands" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > < a class = "reference internal" href = "pair_coeff.html" > < em > pair_coeff< / em > < / a > , pair_sph/rhosum< / p >
< p > < strong > Default:< / strong > none< / p >
< hr class = "docutils" / >
< p id = "monoghan" > < strong > (Monaghan)< / strong > Monaghan and Gingold, Journal of Computational Physics,
52, 374-389 (1983).< / p >
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2015-12-11 01:23:56 +08:00
© Copyright 2013 Sandia Corporation.
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