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<div class="section" id="fix-nph-sphere-command">
<span id="index-0"></span><h1>fix nph/sphere command<a class="headerlink" href="#fix-nph-sphere-command" title="Permalink to this headline"></a></h1>
</div>
<div class="section" id="fix-nph-sphere-omp-command">
<h1>fix nph/sphere/omp command<a class="headerlink" href="#fix-nph-sphere-omp-command" title="Permalink to this headline"></a></h1>
<div class="section" id="syntax">
<h2>Syntax<a class="headerlink" href="#syntax" title="Permalink to this headline"></a></h2>
<div class="highlight-python"><div class="highlight"><pre>fix ID group-ID nph/sphere args keyword value ...
</pre></div>
</div>
<ul class="simple">
<li>ID, group-ID are documented in <a class="reference internal" href="fix.html"><em>fix</em></a> command</li>
<li>nph/sphere = style name of this fix command</li>
<li>additional barostat related keyword/value pairs from the <a class="reference internal" href="fix_nh.html"><em>fix nph</em></a> command can be appended</li>
</ul>
</div>
<div class="section" id="examples">
<h2>Examples<a class="headerlink" href="#examples" title="Permalink to this headline"></a></h2>
<div class="highlight-python"><div class="highlight"><pre>fix 1 all nph/sphere iso 0.0 0.0 1000.0
fix 2 all nph/sphere x 5.0 5.0 1000.0
fix 2 all nph/sphere x 5.0 5.0 1000.0 drag 0.2
fix 2 water nph/sphere aniso 0.0 0.0 1000.0 dilate partial
</pre></div>
</div>
</div>
<div class="section" id="description">
<h2>Description<a class="headerlink" href="#description" title="Permalink to this headline"></a></h2>
<p>Perform constant NPH integration to update position, velocity, and
angular velocity each timestep for finite-size spherical particles in
the group using a Nose/Hoover pressure barostat. P is pressure; H is
enthalpy. This creates a system trajectory consistent with the
isenthalpic ensemble.</p>
<p>This fix differs from the <a class="reference internal" href="fix_nh.html"><em>fix nph</em></a> command, which assumes
point particles and only updates their position and velocity.</p>
<p>Additional parameters affecting the barostat are specified by keywords
and values documented with the <a class="reference internal" href="fix_nh.html"><em>fix nph</em></a> command. See,
for example, discussion of the <em>aniso</em>, and <em>dilate</em> keywords.</p>
<p>The particles in the fix group are the only ones whose velocities and
positions are updated by the velocity/position update portion of the
NPH integration.</p>
<p>Regardless of what particles are in the fix group, a global pressure is
computed for all particles. Similarly, when the size of the simulation
box is changed, all particles are re-scaled to new positions, unless the
keyword <em>dilate</em> is specified with a value of <em>partial</em>, in which case
only the particles in the fix group are re-scaled. The latter can be
useful for leaving the coordinates of particles in a solid substrate
unchanged and controlling the pressure of a surrounding fluid.</p>
<hr class="docutils" />
<p>This fix computes a temperature and pressure each timestep. To do
this, the fix creates its own computes of style &#8220;temp/sphere&#8221; and
&#8220;pressure&#8221;, as if these commands had been issued:</p>
<div class="highlight-python"><div class="highlight"><pre>compute fix-ID_temp all temp/sphere
compute fix-ID_press all pressure fix-ID_temp
</pre></div>
</div>
<p>See the <a class="reference internal" href="compute_temp_sphere.html"><em>compute temp/sphere</em></a> and <a class="reference internal" href="compute_pressure.html"><em>compute pressure</em></a> commands for details. Note that the
IDs of the new computes are the fix-ID + underscore + &#8220;temp&#8221; or fix_ID
+ underscore + &#8220;press&#8221;, and the group for the new computes is &#8220;all&#8221;
since pressure is computed for the entire system.</p>
<p>Note that these are NOT the computes used by thermodynamic output (see
the <a class="reference internal" href="thermo_style.html"><em>thermo_style</em></a> command) with ID = <em>thermo_temp</em>
and <em>thermo_press</em>. This means you can change the attributes of this
fix&#8217;s temperature or pressure via the
<a class="reference internal" href="compute_modify.html"><em>compute_modify</em></a> command or print this temperature
or pressure during thermodynamic output via the <a class="reference internal" href="thermo_style.html"><em>thermo_style custom</em></a> command using the appropriate compute-ID.
It also means that changing attributes of <em>thermo_temp</em> or
<em>thermo_press</em> will have no effect on this fix.</p>
<hr class="docutils" />
<p>Styles with a <em>cuda</em>, <em>gpu</em>, <em>intel</em>, <em>kk</em>, <em>omp</em>, or <em>opt</em> suffix are
functionally the same as the corresponding style without the suffix.
They have been optimized to run faster, depending on your available
hardware, as discussed in <a class="reference internal" href="Section_accelerate.html"><em>Section_accelerate</em></a>
of the manual. The accelerated styles take the same arguments and
should produce the same results, except for round-off and precision
issues.</p>
<p>These accelerated styles are part of the USER-CUDA, GPU, USER-INTEL,
KOKKOS, USER-OMP and OPT packages, respectively. They are only
enabled if LAMMPS was built with those packages. See the <a class="reference internal" href="Section_start.html#start-3"><span>Making LAMMPS</span></a> section for more info.</p>
<p>You can specify the accelerated styles explicitly in your input script
by including their suffix, or you can use the <a class="reference internal" href="Section_start.html#start-7"><span>-suffix command-line switch</span></a> when you invoke LAMMPS, or you can
use the <a class="reference internal" href="suffix.html"><em>suffix</em></a> command in your input script.</p>
<p>See <a class="reference internal" href="Section_accelerate.html"><em>Section_accelerate</em></a> of the manual for
more instructions on how to use the accelerated styles effectively.</p>
</div>
<div class="section" id="restart-fix-modify-output-run-start-stop-minimize-info">
<h2>Restart, fix_modify, output, run start/stop, minimize info<a class="headerlink" href="#restart-fix-modify-output-run-start-stop-minimize-info" title="Permalink to this headline"></a></h2>
<p>This fix writes the state of the Nose/Hoover barostat to <a class="reference internal" href="restart.html"><em>binary restart files</em></a>. See the <a class="reference internal" href="read_restart.html"><em>read_restart</em></a>
command for info on how to re-specify a fix in an input script that
reads a restart file, so that the operation of the fix continues in an
uninterrupted fashion.</p>
<p>The <a class="reference internal" href="fix_modify.html"><em>fix_modify</em></a> <em>temp</em> and <em>press</em> options are
supported by this fix. You can use them to assign a
<a class="reference internal" href="compute.html"><em>compute</em></a> you have defined to this fix which will be used
in its thermostatting or barostatting procedure. If you do this, note
that the kinetic energy derived from the compute temperature should be
consistent with the virial term computed using all atoms for the
pressure. LAMMPS will warn you if you choose to compute temperature
on a subset of atoms.</p>
<p>The <a class="reference internal" href="fix_modify.html"><em>fix_modify</em></a> <em>energy</em> option is supported by this
fix to add the energy change induced by Nose/Hoover barostatting to
the system&#8217;s potential energy as part of <a class="reference internal" href="thermo_style.html"><em>thermodynamic output</em></a>.</p>
<p>This fix computes the same global scalar and global vector of
quantities as does the <a class="reference internal" href="fix_nh.html"><em>fix nph</em></a> command.</p>
<p>This fix can ramp its target pressure over multiple runs, using the
<em>start</em> and <em>stop</em> keywords of the <a class="reference internal" href="run.html"><em>run</em></a> command. See the
<a class="reference internal" href="run.html"><em>run</em></a> command for details of how to do this.</p>
<p>This fix is not invoked during <a class="reference internal" href="minimize.html"><em>energy minimization</em></a>.</p>
</div>
<div class="section" id="restrictions">
<h2>Restrictions<a class="headerlink" href="#restrictions" title="Permalink to this headline"></a></h2>
<p>This fix requires that atoms store torque and angular velocity (omega)
and a radius as defined by the <a class="reference internal" href="atom_style.html"><em>atom_style sphere</em></a>
command.</p>
<p>All particles in the group must be finite-size spheres. They cannot
be point particles.</p>
</div>
<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="fix_nh.html"><em>fix nph</em></a>, <a class="reference internal" href="fix_nve_sphere.html"><em>fix nve_sphere</em></a>, <a class="reference internal" href="fix_nvt_sphere.html"><em>fix nvt_sphere</em></a>, <a class="reference internal" href="fix_npt_sphere.html"><em>fix npt_sphere</em></a>,
<a class="reference internal" href="fix_modify.html"><em>fix_modify</em></a></p>
<p><strong>Default:</strong> none</p>
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