documenting particles

===============

In MFiXi-Exa, particles are managed by the :cpp:`MFIXParticleContainer` class.

This class is derived from AMReX's :cpp:`NeighbourParticleContainer` and

handles all of the particle data. Most importantly,

:cpp:`MFIXParticleContainer` also provides the functions for solving the

particle dynamics (based on particle-particle, particle-fluid, and

particle-wall forces). Most importantly, :cpp:`MFIXParticleContainer` also

provides the functions for solving the particle dynamics (based on

particle-particle, particle-fluid, and particle-wall forces).

Particle Dynamics

-----------------