The FPM can also be used to simulate the spatial and temporal evolution
of the chemical composition of the particles. To do this, modes can be
composed of multiple, immiscible phases, and each phase can be
composed of multiple species. For each additional species, the FPM
requires the solution of an additional scalar.
Below is a schematic of a multiphase particle that can be represented with
the FPM. One phase is used to represent the solid core, and a second
phase is used to represent the liquid mantle. Each phase can include
multiple components.
