are you asking can a simulation of particles be done in solidworks flow simulation? the answer is yes
or are you asking for a description of how that is done mathematically within the software? this is described in the technical reference.
The code is Eulerian. The solver is Eulerian. Lagrangian particle tracking is done in the post processor. It assumes that the presence of the particles is such that it will not affect the flow field significantly. As Jared said the technical reference covers this in more detail.