aerosol-properties-DPM or FPM?

Discrete Phase Model (DPM).
Fine Particle Model (FPM).

The DPM is primarily used to simulate the transport of large, individual particles, whereas the FPM is primarily used to simulate the transport of populations of a large number of small particles.

Large, supermicron, particles, are usually formed by mechanical processes.
Submicron particles are usually formed by chemical processes.

Particles larger than 1 micron are typicall generated by atomization and grinding processes. [Mechanical, The DPM in FLUENT is primarily useful for simulating the dynamics of these supermicron particles], particles less than one micron are typically generated by chemical routes [Chemical, the FPM is primarily useful for simulating the dynamics of these submicron particles.].

Although the DPM can simulate the transport of a distribution of particles, it is really a spatial distribution of similarly sized particles, whereas the FPM simulates the transport of a distribution of differently sized particles.

Also, although the DPM simulates diffusion by using a stochastic walk procedure in Lagrangian simulations, the FPM solves particle diffusion using the coupled convection-diffusion solution scheme inherent in Fluent’s Eulerian CFD solvers.

Feature: FPM -- DPM
Typical size range : <10>=1 micron
Effect of processes on: Particle size distribution -- Single particles
Characteristic size distribution: Lognormal -- Rosin-Rammler
Solution technique: Eulerian -- Lagrangian
Cluster-particle, particle-particle interactions: Nucleation, Coagulation -- None
Brownian motion treated as: Diffusion -- Additional force

FPM: There must be a continuous size distribution of particles in the simulation domain.
DPM: The motion of single particles can be simulated.

So, based on http://university.fluent.com/forum and www.aerosolmodeling.com and the facts from Kalasee et, al. (2007), FPM is the best Model to Simulate Aerosol Particles Transport in this Thesis.

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