Relationship Between Particle Diameter and Mesh Cell Size — Lesson 10

What is the relationship between particle diameter and mesh cell size?

In a dispersed multiphase flow, after the particle fluid interaction in DPM, the DDPM and Eulerian Models are defined as empirical models for subgrid particles (e.g., Schiller Naumann drag model). The particle diameter must be much smaller than the cell size to account for the interaction between phases accurately.

If the particle diameters are larger than the cell size, you must adopt the macroscopic particle model, in which the interactions between phases are determined as part of the solution. In this case, particles span many fluid cells.