<p>Define a computation that calculates the per-atom internal energy
for each atom in a group.</p>
<p>The internal energy is the energy associated with the internal degrees
of freedom of a mesoscopic particles, e.g. a Smooth-Particle
Hydrodynamics particle.</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 value of the internal energy will be 0.0 for atoms not in the
specified compute group.</p>
<p><strong>Output info:</strong></p>
<p>This compute calculates a per-atom vector, which can be accessed by
any command that uses per-atom values from a compute as input. See
<a class="reference internal" href="Section_howto.html#howto-15"><span class="std std-ref">Section 6.15</span></a> for an overview of
LAMMPS output options.</p>
<p>The per-atom vector values will be in energy <a class="reference internal" href="units.html"><span class="doc">units</span></a>.</p>
</div>
<div class="section" id="restrictions">
<h2>Restrictions</h2>
<p>This compute 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 class="std std-ref">Making LAMMPS</span></a> section for more info.</p>
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